Mirion Technologies GEM-5 User manual

GEM-5
Gamma Exit
Contamination Monitor
MAN-GEM5 Rev.01 User’s Manual

Copyright 2017, Mirion Technologies (Canberra CA) Ltd.
All rights reserved.
The material in this document, including all information, pictures, graphics
and text, is the property of Mirion Technologies (Canberra CA) Ltd. and is
protected by Canadian copyright laws and international copyright
conventions.
Mirion Technologies (Canberra CA) Ltd. expressly grants the purchaser
of this product the right to copy any material in this document for the
purchaser’s own use, including as part of a submission to regulatory or
legal authorities pursuant to the purchaser’s legitimate business needs.
No material in this document may be copied by any third party, or used
for any commercial purpose or for any use other than that granted to the
purchaser without the written permission of Mirion Technologies
(Canberra CA) Ltd.
Mirion Technologies (Canberra CA) Ltd., West-50B Caldari Road,
Concord, ON, L4K 4N8, Tel: [phone], FAX: [phone]
http://www.canberra.com/
The information in this document describes the product as accurately as
possible, but is subject to change without notice.
Printed in Canada.
For technical assistance, call our Customer Service Hotline at 1-800-
255-6370 or email hpsuppo[email protected].
If you have purchased your Mirion product from Mirion’s representative
and partner in your country/area, please always contact this company for
support and service first.
Support and Service for Mirion C&C products and systems previously
manufactured by Mirion’s Hamburg Facility (Mirion Technologies) are
also available in Europe from
Mirion Technologies
Ruhrstrasse 49
22761 Hamburg, Germany
Phone [phone] (Hotline)
Phone [phone] (Switchboard)
E-Mail: [e-mail]
All product names and numbers included in the publication are
trademarks of Mirion Technologies, Inc. and/or its affiliates in the United
States and/or other countries.
All other trademarks are the property of their respective owners.

Gem-5 User’s Manual i
Table of Contents
Preface................................................................................................. xi
1. Introduction .................................................................................... 1
Features...........................................................................................................................................3
Safety First......................................................................................................................................4
Electrical Safety.........................................................................................................................4
Over-current Protection......................................................................................................5
Grounding...........................................................................................................................5
Environmental............................................................................................................................5
Pollution Degree.................................................................................................................5
Overvoltage Category.........................................................................................................5
Ingress Protection...............................................................................................................5
2. Installation - First Use of System.................................................. 6
Recommended Storage Locations..................................................................................................6
Recommended In-Service Location ...............................................................................................6
Specific Storage Locations.............................................................................................................6
Unpacking.......................................................................................................................................6
Installation......................................................................................................................................7
Lead Ingot Bricks.......................................................................................................................7
Ramps.........................................................................................................................................9
Relocation.....................................................................................................................................10
Review of Hardware.....................................................................................................................10
Computer Box..........................................................................................................................10
Display Screen .........................................................................................................................11
Review of Detectors.................................................................................................................11
Electrical Connections .............................................................................................................12
AC Electrical Mains Connection......................................................................................12
Relay Connections............................................................................................................12
Input/Output (I/O) Connections...............................................................................................12
Preliminary Check-Out.................................................................................................................12
Model Selection and Configuration..............................................................................................15
Ctrl+F10 – Factory Setup Menu ..............................................................................................17
F1 – Model Selection........................................................................................................18
F2 – Operation Configuration...........................................................................................22
F3 – Badge Configuration ................................................................................................25
F4 – Access Configuration...............................................................................................28
F6 – Access Level Settings...............................................................................................37

ii Gem-5 User’s Manual
F7 – Dosimeter Reader Configuration............................................................................. 40
F9 – Database Settings..................................................................................................... 45
F10 – Methodology Configuration.................................................................................. 46
3. Principle of Operation.................................................................. 48
Normal Service............................................................................................................................ 49
BACKGROUND Initialization/Collection Mode ................................................................... 52
READY Mode......................................................................................................................... 53
POSITION Mode .................................................................................................................... 54
MONITOR Mode.................................................................................................................... 55
CLEAN Mode ......................................................................................................................... 58
CONTAMINATED Mode....................................................................................................... 59
OUT OF SERVICE Mode....................................................................................................... 62
Monitor Out of Service.................................................................................................... 63
High Background Out of Service..................................................................................... 64
Excessive Background Out of Service............................................................................. 65
Detector Contaminated Out of Service............................................................................ 65
Krypton Mode.............................................................................................................................. 66
Alarm Test ................................................................................................................................... 69
4. Unit Setup ..................................................................................... 72
F9 – Plateau Plot.......................................................................................................................... 74
HV Setting for Gamma Scintillation Detectors....................................................................... 78
F8 – Discriminator Plot................................................................................................................ 78
F1 – Optimize Gamma HV.......................................................................................................... 82
Calibration Requirements for Contamination Monitors .............................................................. 88
Why is Calibration Necessary? ............................................................................................... 88
Calibrate Process..................................................................................................................... 89
Factory Default Calibration..................................................................................................... 92
Shift + F3 - Calibration Settings.............................................................................................. 92
5. Parameters Definition .................................................................. 93
Service Menu............................................................................................................................... 93
F1 – Place In Normal Service...................................................................................................... 97
F1 – Place in Conditional Service................................................................................................ 99
F1 – Place in No Database Conditional Service.................................................................... 100
F1 – Place in Krypton Mode Service......................................................................................... 100
F2 – Test Menu.......................................................................................................................... 100
F3 – Setup Menu........................................................................................................................ 101
F1 – Common Values............................................................................................................ 103
F2 – Wait Timeouts............................................................................................................... 106
F3 – Detection Zones ............................................................................................................ 111

Gem-5 User’s Manual iii
F1 – Zone Configuration ................................................................................................113
F2 – (Zone) Settings.......................................................................................................116
F3 – Calibration.............................................................................................................121
Shift+F3 – Calibration Settings......................................................................................127
F5 – Group Settings........................................................................................................129
Shift+F5 – Global Settings.............................................................................................131
F7 – Alarm Test Settings................................................................................................133
F9 – Edit Calibration Source List...................................................................................137
F4 – Out of Service Causes....................................................................................................141
F5 – Configuration.................................................................................................................148
F6 – Operation Voice & Screen.............................................................................................151
F7 – Data Log ........................................................................................................................155
Alarm Test Data Log......................................................................................................162
Service Data Log............................................................................................................162
Events Data Log.............................................................................................................164
Background Trend Data Log..........................................................................................165
Contaminated Results Data Log.....................................................................................166
Clean & Contaminated Results Data Log.......................................................................167
Raw Background Data Log ............................................................................................167
Calibration Trend Log....................................................................................................168
Verification Test Trend Log...........................................................................................168
F8 – Printout...........................................................................................................................169
F9 – Data Transfer (Network) Setup......................................................................................174
F11 – (Operation) Instruction Menu ......................................................................................181
F1 – Ready Instructions..................................................................................................183
Shift+F1 – Background Instructions...............................................................................184
F2 – Position Instructions...............................................................................................185
F3 – Go Back Instructions..............................................................................................186
F4 – Clean Instructions...................................................................................................187
F5 – Contaminated Instructions......................................................................................188
F6 – Turn Instructions ....................................................................................................189
F7 – Out of Service Instructions.....................................................................................190
F8 – Messages Instructions.............................................................................................191
F10 – Banner(s) Instructions ..........................................................................................192
F11 – Alarm Test Instructions........................................................................................193
6. Diagnostics/Maintenance .......................................................... 194
Using Test Screens.....................................................................................................................194
F2 – Test Menu...........................................................................................................................196
F1 – Rate Meter......................................................................................................................197
F2 – HVPS Meter...................................................................................................................200
F3 – Counter Test...................................................................................................................201

iv Gem-5 User’s Manual
F4 – Amplifier Pulse Test...................................................................................................... 202
Specific Information for Bench Test Models only......................................................... 204
F6 – Sensor Board Tests........................................................................................................ 205
F7 – Timer Tests.................................................................................................................... 207
F10 – Detector Board ID....................................................................................................... 208
F11 – Carrier Board Tests ..................................................................................................... 209
F12 – Background Trend Graph............................................................................................ 212
Shift+F2 – Additional Test Menu.............................................................................................. 213
F2 – Optimize Self Shield Factors......................................................................................... 213
Procedure....................................................................................................................... 215
F3 – Test Auxiliary Sensor Board......................................................................................... 218
F7 – Barrier Exerciser ........................................................................................................... 219
F4 – Faults ................................................................................................................................. 221
Determining Faults................................................................................................................ 223
Failure to Return to Service................................................................................................... 225
General Information....................................................................................................... 225
Troubleshooting Guide .................................................................................................. 228
F8 – Maintenance Log............................................................................................................... 233
F9 – Recent Event Log.............................................................................................................. 234
7. Retrieving Information ............................................................... 236
F5 – Information Menu.............................................................................................................. 236
F1 – Monitor History............................................................................................................. 236
F2 – Service History.............................................................................................................. 239
F3 – Background History...................................................................................................... 242
F4 – Monitor Time vs. Bkg Rate........................................................................................... 246
Shift+F4 - Monitor Time vs. Bkg Time ................................................................................ 247
F5 – Monitor Time vs. Alarm Value..................................................................................... 249
F6 – Monitor Zone Status...................................................................................................... 250
F7 – System Status................................................................................................................ 252
F6 – Printout Menu.................................................................................................................... 253
F1 – Monitor History Printout............................................................................................... 255
F2 – Service History Printout................................................................................................ 256
F3 – Calibration Printout....................................................................................................... 257
F4 – Calibration Data Printout .............................................................................................. 258
F5 – Contamination Check Results Printout......................................................................... 259
F6 – Calibration Source List Printout.................................................................................... 265
F7 – All Setup Values Printout.............................................................................................. 267
F8 – Calibration Check Results Printout............................................................................... 268
A. Algorithms .................................................................................. 270
Probability Theory..................................................................................................................... 270

Gem-5 User’s Manual v
Counting Statistics......................................................................................................................270
Confidence Levels..................................................................................................................270
K Alpha - False Alarm Due to Background Rate...................................................................274
K Beta - Positive Alarm Due to Contamination.....................................................................275
K Delta - Change in Background Rate...................................................................................275
Background Rate ........................................................................................................................275
Background Rate Calculations...............................................................................................275
Background Variance Ratio...................................................................................................277
Background Rate Reset..........................................................................................................278
High Background Rate Settings and Strategy........................................................................279
Low Background Rate Setting and Strategy..........................................................................282
Measurement Variance Ratio Setting and Strategy (Background Change Tracking)............284
Alarm Settings and Strategy.......................................................................................................285
Alarm Trip Points...................................................................................................................286
Counting Time Strategy.........................................................................................................289
Background FALSE Alarm Rate (FAR)................................................................................290
Confidence of Alarm..............................................................................................................291
Efficiency Calculation (and Derived Efficiencies).....................................................................291
B. Operating Files and Directory Structure .................................. 294
Basic Structure............................................................................................................................294
Custom Files...............................................................................................................................295
Driver Files.................................................................................................................................297
SetupTXT Files ..........................................................................................................................297
Settings Files ..............................................................................................................................297
Setup Menu............................................................................................................................297
Test Menu ..............................................................................................................................299
Additional Test Menu ............................................................................................................300
Factory Setup Menu...............................................................................................................301
History Files ...............................................................................................................................301
Temporary Files..........................................................................................................................302
Viewing Datalog Files with Excel..............................................................................................303
Sound Files.................................................................................................................................304
Voice Files..................................................................................................................................304
Creating Wave Files...................................................................................................................307
C. Special Information.................................................................... 309
Alarm Test vs. Occupant Alarm.................................................................................................309
Case 1.....................................................................................................................................309
Case 2.....................................................................................................................................310
Initial Setup............................................................................................................................310
Self Shielding.........................................................................................................................310

vi Gem-5 User’s Manual
F7 – Demonstration Display Menu............................................................................................ 311
F1 – Ready............................................................................................................................. 312
Shift+F1 – Background......................................................................................................... 312
F2 – Position.......................................................................................................................... 312
F3 – Count Down.................................................................................................................. 312
F4 – Clean ............................................................................................................................. 312
F5 – Contaminated ................................................................................................................ 312
F6 – Turn............................................................................................................................... 312
F7 – Out of Service ............................................................................................................... 313
F8 – Messages....................................................................................................................... 313
F10 – Cold Side..................................................................................................................... 313
F11 – Alarm Test................................................................................................................... 313
Demonstration Mode ................................................................................................................. 313
Simulator Mode ......................................................................................................................... 316
D. Isotope Library ........................................................................... 317
E. Further Information.................................................................... 318
Numeric Notation ...................................................................................................................... 318
Special Character Codes............................................................................................................ 319
Support for Non-US Keyboards................................................................................................. 320
F. Specifications – Standard Models ............................................ 323
Operating Modes........................................................................................................................ 324
Alarms........................................................................................................................................ 324
Parameter Setting....................................................................................................................... 324
Occupant Specifications ............................................................................................................ 325
Height of Occupant........................................................................................................ 325
Weight of Occupant....................................................................................................... 325
Radiological............................................................................................................................... 325
Radiation Detected................................................................................................................ 325
Typical Efficiencies............................................................................................................... 325
Detector Types ...................................................................................................................... 326
Mechanical................................................................................................................................. 326
Handling................................................................................................................................ 326
Cabinet................................................................................................................................... 326
Dimensions............................................................................................................................ 326
Weights.................................................................................................................................. 326
Electronics ................................................................................................................................. 326
Computer............................................................................................................................... 326
Display Screen....................................................................................................................... 327
Environmental............................................................................................................................ 327
Pollution Degree.................................................................................................................... 327

Gem-5 User’s Manual vii
Temperature...........................................................................................................................327
Relative Humidity..................................................................................................................327
Power Requirements ..............................................................................................................327
Power Consumption...............................................................................................................327
Sensors........................................................................................................................................328
Detector Numbers and Positions ................................................................................................328
G. Specifications – Options ........................................................... 329
(ID) Card Reader Options...........................................................................................................329
Magnetic Card Reader............................................................................................................330
Barcode Card Reader .............................................................................................................330
HID Compatible Proximity Card Reader...............................................................................330
CRemote Option (SCN 7062263)...............................................................................................330
Local Database Support Option..................................................................................................330
Models............................................................................................................................331
Source Calibration Fixture Options .......................................................................................332
Access Control Options..........................................................................................................332
Exit Control....................................................................................................................333
Barrier Arms...................................................................................................................333
Doors ..............................................................................................................................334
IPCAM212 Camera................................................................................................................334
Entrance/Exit Ramps..............................................................................................................335
2nd Layer of Lead Kit For Sides.............................................................................................335
Lead Kit For Top....................................................................................................................335
Lead Kit For Bottom..............................................................................................................335
H. Component Details – Standard Models .................................... 336
General Description....................................................................................................................336
Detectors.....................................................................................................................................337
Gamma Scintillation Detectors ..............................................................................................337
Computer Box (SCN 7079642)..................................................................................................337
Carrier Board (SCN 7078120)....................................................................................................337
Detector Boards..........................................................................................................................339
Board Settings........................................................................................................................340
Gamma Detector Board (SCN 816112).................................................................................342
Gamma Detector Digital Board (SCN 816102)..............................................................342
Gamma Detector Analog Board (SCN 816107).............................................................343
Sensor Boards.............................................................................................................................344
Four-Relay Sensor Board (SCN 816540)...............................................................................344
Serial Bus Terminator Board (SCN 816546)..............................................................................349
Sensors........................................................................................................................................349
Approach Sensor....................................................................................................................350

viii Gem-5 User’s Manual
Occupied Sensor.................................................................................................................... 350
Body-In Sensors .................................................................................................................... 351
I. Component Details – Options ................................................... 352
Other Optional Boards............................................................................................................... 352
Auxiliary Sensor Board (SCN 816696)................................................................................. 352
J. Routine & Preventative Maintenance – Standard Models ....... 356
Routine and Preventive Maintenance ........................................................................................ 356
Cleaning................................................................................................................................. 356
Decontamination ................................................................................................................... 357
Testing for Alarms................................................................................................................. 358
Repair of Detectors.................................................................................................................... 358
Replacing a Damaged Detector............................................................................................. 359
Scintillation Detectors.................................................................................................... 360
Replacing a Damaged Photomultiplier Tube......................................................................... 363
Sensor Setup .............................................................................................................................. 364
Motion Sensor ....................................................................................................................... 364
Photoelectric Sensors ............................................................................................................ 365
Through-Beam Infrared Photo Sensor........................................................................... 365
Background Suppression Infrared Photo Sensor ........................................................... 366
Computer Box............................................................................................................................ 367
Computer Windows 7 (or XP) Embedded Operating System............................................... 368
Solid State Drive Maintenance.............................................................................................. 369
Reinstalling or Updating Monitor Software.......................................................................... 370
Updating Monitor Software........................................................................................... 370
Reinstalling Monitor Software....................................................................................... 370
Reinstalling or Updating Windows 7 Image......................................................................... 370
BIOS Setup............................................................................................................................ 370
SOM 4463/4463N (SCN 7071914) BIOS Setup Procedure.......................................... 370
K. Preventative Maintenance – Options ........................................ 371
Barrier Arms Option.................................................................................................................. 371
Installation............................................................................................................................. 371
Adjustment/Maintenance....................................................................................................... 371
DC Motor Controller for Access Control Options..................................................................... 371
Inputs and Outputs................................................................................................................. 372
Switches................................................................................................................................. 373
Overview........................................................................................................................ 373
LED Functionality ......................................................................................................... 374
Operation............................................................................................................................... 374
Overview........................................................................................................................ 374

Gem-5 User’s Manual ix
Description of the Learning Phase..................................................................................374
Description of the Normal Operation Phase...................................................................375
Safety features........................................................................................................................375
Technical characteristics........................................................................................................375
Barrier Arms Option.......................................................................................................375
L. Detectors & Preamplifiers – Standard Models ......................... 376
M. Spare Parts Lists – Standard odels .......................................... 377
GEM-5........................................................................................................................................377
Spare Parts for the Construction and Commissioning Period (1-2 years)..............................377
Spare Parts for 3-5 years Operation.......................................................................................377
Spare Parts As Needed...........................................................................................................378
N. Spare Parts Lists – Options ...................................................... 379
Barrier Arms...............................................................................................................................379
Spare Parts for up to Five Years Operation............................................................................379
O. Block Diagrams – Standard Models ......................................... 380
GEM-5 General Arrangement....................................................................................................381
GEM-5 Serial..............................................................................................................................383
P. Block Diagrams – With Options ................................................ 385
GEM-5W93 General Arrangement ............................................................................................387
GEM-5W100 General Arrangement ..........................................................................................389
GEM-5W80-W93-W100............................................................................................................391
Q. WebRemote ................................................................................ 393
WebRemote Overview ...............................................................................................................393
Summary of Features .............................................................................................................393
Web Browser Connectivity and Status Monitoring....................................................................394
Prerequisites ...............................................................................................................................395
Touch screen Kit (Optional)...................................................................................................395
Computer Model ....................................................................................................................397
Software Upgrade...................................................................................................................397
Installation of WebRemote, Monitor 9.0 (or above) , and DashBoard.......................................399
DashBoard Status Monitoring....................................................................................................400
Configuration of Contamination Monitors.............................................................................402
Plan Your Network Connection .................................................................................................403
How to Assign a Static IP......................................................................................................404
Windows 7 Operating System........................................................................................404
Remote Connection to WebRemote ...........................................................................................407
LAN Access...........................................................................................................................407
Direct Link Access.................................................................................................................408

x Gem-5 User’s Manual
How to Use WebRemote ........................................................................................................... 409
WebRemote Layout and Controls......................................................................................... 410
Index ................................................................................................. 417

Gem-5 User’s Manual xi
Preface
All Mirion Technologies (Canberra CA) Ltd. contamination monitors are based on
similar detectors, sensors, counting and control electronics and computer hardware.
Most changes in the modular hardware have evolved from technological
enhancements, which were then incorporated into all newly manufactured monitors.
In addition, the software, which controls the operation of the unit and the built-in
diagnostics, is similar on all models. As a result, much of the Installation and
Maintenance information andthe procedures for Setup, Operation, Calibration and
Diagnostics provided in this manual apply to several models similarly.
The software is adapted to reflect the actual configuration of each model, such as the
type, number and location of detectors and the applicable options. As a result, the
screens displayed on different models may differ slightly from those in this manual;
however, the procedures described apply to all units, except where noted.
•The intended use of Personnel Contamination Monitors is for contamination
monitoring for persons. Any other use is considered prohibited.
This manual describes the Mirion Technologies (Canberra CA) Ltd. Monitor
Software Version 9.00.1, including information on Setup, Operation and Calibration
as well as the extensive diagnostic and testing capability usingthe Test menus. The
software revision number is displayed onseveral screens, including the “READY”
and the “FAULTS” screens.The following typographic conventions are used
throughout this manual.
Names of Keys on the Keyboard
This manual shows the names of the keyboard keys as they usually appear on a
keyboard and are seen in capital letters (for example, ESC, ENTER, CTRL).
Key Sequences
If a comma ( , ) separates the names of the keys, this means they must be pressed in
sequence. For example, “Press ALT, SPACEBAR” means that you should press ALT
and release it, then press and release the SPACEBAR.
Key Combinations
A plus sign (+) between two key names means that these keys must be pressed at the
same time. For example, “Press ALT+ESC” means that you should press the ALT key
and hold it down while you press the ESC key.
Dialog Box Elements
Dialog Box Elements are shown in Bold type. Elements of a dialog box include:
check boxes, check boxes, combo boxes, drop down lists, group boxes, radio options,
tabs, text boxes, field names, etc. Note that the font is different from that used for
menu commands, soft keys, and buttons.

xii Gem-5 User’s Manual
Window Names, Menu Commands, Window Command Buttons, and Soft
Keys/Buttons
Menu items are shown in Special Bold type. Note that the font is different from that
used for dialog box elements.
Cascading items (such as menu steps and sub-steps) are separated by a space, a pipe
(|), and a second space, and in a special bold typeface, e.g., File | Save.
User Entries
Text you are expected to type in is shown in Courier New (monospaced style)
type.
File Names/Path Names
Names of files and directory path names are shown in Arial (C:\GENIE2K).
Titles
Titles of books and of manual chapters and section are shown in italics.
Each of its chapters covers specific functions and are divided into the following
arrangement:
Chapters
Chapter 1, Introduction, is an introduction to the product and an overview of the
product’s features. In addition, it provides selected safety information.
Chapter 2, Installation - First Use of System, includes information on how to
prepare the product upon receipt as well as a preliminary check-out (both basic
hardware and software setups are discussed).
Chapter 3, Principle of Operation, discusses the main modes of operation and Out
of Service descriptions.
Chapter 4, Unit Setup, provides information on the different types of plots
available for High Voltage (including Figure of Merit Optimization) and
Discrimination setup as well as calibration requirements and methodology.
Chapter 5, Parameters Definition, provides information on software parameters
including an extensive review of the majority of the software setup menus not
discussed in Chapter 4, Unit Setup, Chapter 6, Diagnostics/Maintenance or
Chapter 7, Retrieving Information.
Chapter 6, Diagnostics/Maintenance, gives help on maintaining the unit by
discussing the Test menus and how to handle Faults by troubleshooting.
Chapter 7, Retrieving Information, describes how to obtain useful information
and data from the monitor.

Gem-5 User’s Manual xiii
Appendices
The appendices offer useful information not usually needed in day-to-day
operation including descriptions of the monitor’s hardware and special software
information. This includes such information as the number and location of
detectors and sensors, detailed descriptions of the Mirion Technologies
(Canberra CA) Ltd. proprietary electronic boards, along with instructions for
installation and routine maintenance.

xiv Gem-5 User’s Manual
Important Safety Considerations
Read Carefully
General Safety
Indicates warning of mains or high voltage present at output labelled HV.
Risk of electrical shock if covers are removed.
Caution - risk of danger. Refer to documentation for detailed explanation of caution
symbol wherever marked.
Earth tree symbol - indicates the connection point for the primary earth (ground)
supply.
Product complies with appropriate current EU directives.
Product complies with appropriate current FCC UL/CSA 61010-1 directives.
Mechanical Safety: Caution - risk of injury due to moving parts.
Personal Safety: Protective gear is required.
Environmental Safety: Caution surfaces hot/cold.
Manufacturer's Address

Features
Gem-5 User’s Manual 1
1. Introduction
Thank you for ordering the Mirion Technologies (Canberra CA) Ltd. GEM™-5
Gamma Exit Monitor. The GEM-5 gamma exit monitor provides power plants and
nuclear facilities the very latest gamma detection capability tomonitor pedestrians
leaving areas of potential radioactive contamination. Operation of the monitor is
straightforward and reliability is assured with both audible and visual aids to support
monitoring activities. The easy to see color LCD screen provides visual cues and
readily displays contaminated areas. Additionally, users are guided through the
monitor with a voice annunciator, which provides clear voice prompts necessary for
dependable unassisted operation during normal conditions.
Access to the installed computer is through a single convenient panel on the front of
the monitor. Computer connections inside this access door also include an on/off
switch, VGA port, serial port, Ethernet port and USB ports. This door is lockable to
limit access to these connections.
Figure 1 GEM-5 Gamma Exit Monitor
All Mirion Technologies (Canberra CA) Ltd. Contamination Monitors provide fast
sensitive monitoring. Due to modularity of components and extensive diagnostics,
direct reductions in consumable and workforce maintenance costs can be realized.
Modern appearance and reliable industrial embedded PC-based operation with better
tracking of contamination and faster, more thorough item throughput at boundary
points can further enhance a facility’s contamination control program.
In addition, these monitors use the same “fast following” background trending and
release-limit algorithms consistent with the Mirion Technologies (Canberra CA)
Ltd. Argos, Sirius and Cronos families providing the best possible performance in
stable or varying radiation fields.

Chapter 1 Introduction
2 Gem-5 User’s Manual
The very low detection threshold is optimized by the quantity and sensitivity of the
detectors, the thickness of the lead shielding and the measuring time, so that stringent
user requirements can be met.
The devices are rugged and reliable; and they are extremely easy to use, even for non-
specialists.
All Mirion Technologies (Canberra CA) Ltd. personnel monitors use industrial-
grade plug-in computers with internal solid-state drive, high-resolution color LCD
displays, and digitized sound for prompts and instructions. All computer
components are readily available through Mirion Technologies (Canberra CA) Ltd.,
simplifying repair and replacement of parts. For ease of setup, calibration and
maintenance, access to the installed computer is through a conveniently located
locked access door. Computer connections inside this access door include an on/off
switch, VGA port, serial port, Ethernet port and USB ports.1
The GEM-5 provides power plants and nuclear facilities the very latest gamma
detection capability to monitor pedestrians leaving areas of potential radioactive
contamination.
User friendly – no user interface required during normal operation.
Voice annunciator guides individuals through the monitoring process.
An audible alarm notifies individuals of contamination and a new larger easy to see
color LCD screen readily displays contaminated areas.
The monitor is designed to be operated in one of three different modes depending
upon the level of detection capability needed. These are:
1. Walkthrough (monitor determines MDA based on user settable parameters).
2. Pause-and-count (enter the monitor, wait for a user settable length of time, then
exit).
3. Two-step (stand facing the detectors for a short period (time user settable or
calculated by monitor), turn 180º and repeat count, and then exit).
The user interaction with the unit for contamination monitoring is intuitive and
uncomplicated. The underlying analysis and control software is both sophisticated
and flexible. The built-in data logging and diagnostic reporting capability along with
the integral comprehensive test routines are usually the only tools needed by the
service technician.
1A bootable Setup USB Flash Memory Stick is exclusively used as the Bootable Flash Memory device. Obtain the serial
number of the unit in question and contact your local Mirion Technologies (Canberra CA) Ltd.Service affiliate for more information.

Features
Gem-5 User’s Manual 3
Features
Use the following list and table to understand the features of the GEM-5 Gamma Exit
Monitor:
• “Best in Industry” sensitivity
• Eight identical large plastic scintillators
− Three per side
− One top/bottom
• 25 mm (1 in.) lead shielding
• Lead is provided as ingots for easy field installation
• Additional second set of lead shielding available for areas with higher
background conditions
• Integral (Embedded Windows 7) computer
− Requires no external PC for setup/calibration
− Fully LAN ready (networkable)
• Color LCD screen and annunciator lights
• Voice prompts for ease of use
• Bi-directional operation (i.e., approach from either direction)
• Continuous automatic background subtraction
• Built in support for “Optimize Gamma HV”
• High Voltage Optimization using Figure-of-Merit (FOM) calculations for
models with Gamma scintillation detectors (Argos Zeus, GEM-5 and Cronos)
• Fixed or variable count times (calculated and optimized as a function of the
alarm level set, the background and the desired accuracy of measurement).

Chapter 1 Introduction
4 Gem-5 User’s Manual
Table 1 Current Serial BusPC (SCN 7079642)
Whole BodyGamma Exit Contamination Monitors
MODEL
TYPES
of
RAD’N
Steps
DETECTORS RECOMMENDED
APPLICATION
Type Model /
SCN
Number Area
(cm2)
GEM-5 Gamma 1-Step
or
2-Step
Scintillator 815436 8 16,832 Gamma Exit Monitor
Safety First
Electrical Safety
Dangerous voltage levels are present inside the cabinet of the monitor. Service
personnel should exercise appropriate safety precautions around live electrical
circuits. This may include, but is not limited to, various power supplies enclosed
within the computer box and external to say box located on the roof or lower section
of utility panel etc. (like those connected to optional barriers or IP cameras).
WARNING:
Since there may or may not be an externally
accessible electrical switch or circuit breaker
device on this monitor, electrical isolation is
achieved by disconnecting the 3-prong IEC 320
power inlet connector if supplied (it would be
located on the roof) and/or by using the customer’s
branch circuit electrical breaker/lockout switch.
The monitor should also be disconnected from the
facility’s AC supply.
CAUTION: Mirion Technologies (Canberra CA) Ltd.
recommends that a safety ladder be used
every time access to any roof-mounted AC cords,
plugs and sockets is required