Thermo Scientific RIIDEye X-G User manual

Handheld Radio-Isotope Identification Device
Model RIIDEye
X-G, -H, -GN, -HN
Operator and Technical Manual
DB-099 E
Revision I December 2016

Thermo Scientific 12/22/2016 RIIDEye DB-099E Operator Manual ii
© 2016 Thermo Fisher Scientific Inc. All rights reserved.
Thermo Fisher Scientific Inc. provides this document to its customers with a product purchase to use
in the
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The contents of this document are subject to change without notice. All technical information in this
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supersede
all previous information received by the purchaser.
Thermo Fisher Scientific Inc. makes no representations that this document is complete, accurate or
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Rev. Rev.
State
Dept.
Resp
Name Rev. page Cat.* Explanation
A 10/28/2013 PGT/RM&SI
-E
Tr
B 04/23/2014 RM&SI Mas/Tr Complete A Complete revision V 3.9.6
C 04/28/2014 RM&SI JW/LD
Gr/Tr
xv A Revision contact information
D 06/13/2014 RM&SI SM/LD 22-
25,46,67,70
A Corrections
E 08/05/2014 RM&SI Tr 76, 78 I Spec Correction: “R” to “rem”,
QCC
F 09/12/2014 RM&SI-E Tr 78 A Radiation Measurements
Specifications added
G 08/28/2015 RM&SI-E
ECN 80160
Tr 19, 20
75, 76
complete
A
C, I
New Battery compartment
Recall of factory settings
Small corrections in whole
document
H 06/24/2016 RM&SI-EH Winter 3 A ECN 80844
I 12/22/2016 RM&Si-EH Winter 17, 18 A ECN 80755
Category C: editorial correction
I: clearing improvement
A: substantial amendment
Explanations must be given, at least with Category A.
Microsoft is either a registered trademark or trademarks of Microsoft in the United States and
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Other trademarks and trade names that may be used in this document to refer to either the entities
claiming the marks and names or their products.

Thermo Scientific 12/22/2016 RIIDEye DB-099E Operator Manual iii
Regulatory Compliance
Thermo Fisher Scientific performs complete testing and evaluation of its products to ensure full compliance
with
applicable domestic and international regulations. When the system is delivered to you, it meets all
pertinent
electromagnetic compatibility (EMC) and safety standards as described in the next section or
sections by product name.
Changes that you make to your system may void compliance with one or more of these EMC and safety
standards.
Changes to your system include replacing a part or adding components, options, or peripherals not
specifically
authorized and qualified by Thermo Fisher Scientific. Toensure continued compliance with EMC and
safety standards,
replacement parts and additional components, options, and peripherals must be ordered
from Thermo Fisher Scientific
or one of its authorized representatives.
EMC Directive
2004/108/EC
This device complies with EMC directive 2004/108/EC and harmonized standard IEC EN 61326-1:2006 Class A.
Low Voltage Safety
Compliance
This device complies with Low Voltage Directive 2006/95/EC and harmonized standard EN 61010-1:2001.
FCC Compliance
Statement
THIS DEVICE COMPLIES WITH PART 15 OF THE FCC RULES. OPERATION IS SUBJECT TO THE FOLLOWING TWO
CONDITIONS: (1) THIS DEVICE MAY NOT CAUSE HARMFUL INTERFERENCE, AND (2) THIS DEVICE MUST
ACCEPT ANY INTERFERENCE RECEIVED, INCLUDING INTERFERENCE THAT MAY CAUSE UNDESIRED
OPERATION.
CAUTION
Read and understand the various precautionary notes, signs, and symbols
contained inside this manual pertaining to the safe use and operation of this
product before using the device.

Thermo Scientific 12/22/2016 RIIDEye DB-099E Operator Manual iv
WEEE Compliance
This product is required to comply with the European Union’s Waste Electrical & Electronic Equipment
(WEEE)
Directive 2002/96/EC. It is marked with the following symbol:
Thermo Fisher Scientific has contracted with one or more recycling or disposal companies in each European
Union
(EU) Member State, and these companies should dispose of or recycle this product. See
www.thermoscientific.com/rohsweee for further information on Thermo Fisher Scientific’s compliance with
these Directives and the recyclers in your country.
WEEE Konformität
Dieses Produkt muss die EU Waste Electrical & Electronic Equipment (WEEE) Richtlinie 2002/96/EC
erfüllen.
Das Produkt ist durch folgendes Symbol gekennzeichnet:
Thermo Fisher Scientific hat Vereinbarungen mit Verwertungs-/Entsorgungsfirmen in allen EU-
Mitgliedsstaaten
getroffen, damit dieses Produkt durch diese Firmen wiederverwertet oder entsorgt
werden kann. Mehr Information
über die Einhaltung dieser Anweisungen durch Thermo Fisher Scientific,
über die Verwerter, und weitere Hinweise,
die nützlich sind, um die Produkte zu identifizieren, die unter
diese RoHS Anweisung fallen, finden sie unter
www.thermoscientific.com/rohsweee.
Conformité DEEE
Ce produit doit être conforme à la directive européenne (2002/96/EC) des Déchets d'Equipements
Electriques et
Electroniques (DEEE). Il est marqué par le symbole suivant:
Thermo Fisher Scientific s'est associé avec une ou plusieurs compagnies de recyclage dans chaque état
membre de
l’union européenne et ce produit devrait être collecté ou recyclé par celles-ci. Davantage
d'informations sur la
conformité de Thermo Fisher Scientific à ces directives, les recycleurs dans votre
pays et les informations sur les
produits Thermo Fisher Scientific qui peuvent aider la détection des
substances sujettes à la directive RoHS sont
disponibles sur www.thermoscientific.com/rohsweee.

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Thermo Scientific 12/22/2016 RIIDEye DB-099E Operator Manual v
Contents
Preface xii
Manual Conventions................................................................................ xii
Related Documentation ........................................................................... xii
Safety and Special Notices........................................................................ xii
Safety Instructions...............................................................................xiii
Contacting Us ........................................................................................ xiv
Introduction 1
About Your RIIDEye ...................................................................................1
What’s in the Box ..................................................................................2
Quick Reference Guide ..............................................................................3
Getting Ready .......................................................................................3
Basic Operation.....................................................................................5
Identification (ID) ..................................................................................7
Menus..................................................................................................9
Turn Off RIIDEye....................................................................................9
Description of Keypad................................................................................9
Description of the Soft Keys .....................................................................10
Display Conventions ................................................................................10
Color Meanings...................................................................................11
Count Rate Information .......................................................................11
Nuclide Classes ...................................................................................11
Soft Keys ............................................................................................11
Menus................................................................................................12
Self Test and Status Screen.......................................................................12
Entering a Password ............................................................................13
User or Administrator Operation ..............................................................14
Connections 15
RIIDEye Assembly ....................................................................................15
Connecting AC Power ..............................................................................16
Batteries.................................................................................................17

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Spare Battery Holder ...........................................................................18
Optimizing Battery Life ........................................................................18
Data Storage and Reachback Options ........................................................19
Compact Flash Card.............................................................................19
Satellite Telephone using Reachback Cable............................................20
USB to PC using PC Interface Cable .......................................................24
General Operation.......................................................................................................27
Connecting the Shoulder Strap .................................................................27
Turning the Power On and Off ..................................................................27
Enforced Power Down .........................................................................28
Safety of Data and Date/Time Information ............................................28
Detector Stabilization Period................................................................28
Search Screens........................................................................................29
Dial Search Screen...............................................................................30
Finder Search Screen ...........................................................................31
Bars Search Screen ..............................................................................32
Search Screen Spectrum ......................................................................33
Audible Search Setting .........................................................................33
Radiation Alarms.....................................................................................33
Identifying Sources of Radiation ...............................................................34
Trigger list ..........................................................................................34
Starting the Nuclide ID.........................................................................35
Colored Areas in the Spectra ................................................................36
Yellow Peaks (UNC) .............................................................................36
Red Peaks (UNK) .................................................................................36
Analysis Report .......................................................................................37
Storing, Reviewing, and Erasing Spectra ....................................................38
Taking a Background................................................................................39
General Concept of Use ...........................................................................42
Calibration 45
AutoCal ..................................................................................................45
Coarse Calibration (Gain, Offset)...............................................................47

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Fine Energy Calibration (Linearity) ............................................................49
Dose Rate Calibration ..............................................................................49
System Menus.............................................................................................................51
Using the Menus .....................................................................................51
Entering the Menu ..............................................................................51
Moving Through the Menu Headers and Entering a Menu ......................51
Moving in the Menu and Changing Values .............................................53
User Menus ............................................................................................55
Spectral Data ......................................................................................55
Field Settings ......................................................................................57
Configuration......................................................................................59
Help Menu..........................................................................................62
Admin ................................................................................................63
Factory Settings ..................................................................................67
Help & Troubleshooting...............................................................................................69
RIIDEye Does Not Power-up .....................................................................69
White Screen Flash Only ......................................................................69
No Reaction at All................................................................................69
Zero Count Rate ......................................................................................70
If You Drop RIIDEye .................................................................................70
RIIDEye Does Not Switch Off ....................................................................70
Coarse Calibration Cs-137 Fails .................................................................70
Generic Timeout .....................................................................................71
Unable to Write to File.............................................................................71
Low ID Counts.........................................................................................71
Recall Factory Settings and Calibration ......................................................73
Maintenance & Service................................................................................................77
Spare Parts .............................................................................................77
Cleaning the Instrument ..........................................................................78
Regular Maintenance ..............................................................................78
Specifications79
General Specifications .............................................................................79

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Thermo Scientific 12/22/2016 RIIDEye DB-099E Operator Manual viii
Radiation Measurement Specifications .....................................................80
Nuclide Identification Specifications..........................................................81
Peak Efficiency for NaI Specifications ........................................................81
Peak Efficiency for LaBr Specifications.......................................................82
Specifications of Components ..................................................................83
Preamplifier........................................................................................83
ADC....................................................................................................83
Pulse Processing..................................................................................83
Spectrum Conversion ..........................................................................83
System Controller................................................................................83
Power ................................................................................................84
Gamma Detector RIIDEye X-G and GN ...................................................84
Gamma High Resolution RIIDEye X-H, RIIDEye X-HN ...............................84
Neutron Detector RIIDEye X-GN, RIIDEye X-HN ......................................84
Appendix 1 – Menu Structure Summary........................................................................85

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Thermo Scientific 12/22/2016 RIIDEye DB-099E Operator Manual ix
Figures
Figure 1. RIIDEye X .........................................................................................................2
Figure 2. CF card orientation ...........................................................................................3
Figure 3: Status screen followed by Dial screen.................................................................4
Figure 4. Soft key control showing Background, Identify, and Finder...................................5
Figure 5: Available search modes.....................................................................................6
Figure 6: Dial mode, signal strength .................................................................................6
Figure 7: Finder mode, signal strength .............................................................................7
Figure 8: Soft key Identify starts nuclide ID.......................................................................8
Figure 9: SNM Assist.......................................................................................................9
Figure 10: RIIDEye keypad...............................................................................................9
Figure 11: Soft keys ......................................................................................................10
Figure 12: Navigation through the menu ........................................................................12
Figure 13: Successful POST screen .................................................................................12
Figure 14: Login screen .................................................................................................13
Figure 15: Main components.........................................................................................15
Figure 16: Lower front face of RIIDEye ...........................................................................16
Figure 17: Charging the internal batteries with the AC adapter ........................................16
Figure 18: Battery holder with assembled batteries....................................................17
Figure 19: CF card with label .........................................................................................19
Figure 20: USB Compact Flash card adapter to USB with CF card connector details ............20
Figure 21: RIIDEye Reachback cable and serial port .........................................................21
Figure 22: Selecting Reachback in Admin menu ..............................................................22
Figure 23: Reachback Phone # in Admin menu................................................................22
Figure 24: Spectral Data menu ......................................................................................23
Figure 25: Satellite connection verification .....................................................................23
Figure 26: Send or view report ......................................................................................23
Figure 27: RIIDEye PC Interface cable and serial port.......................................................24
Figure 28: Selecting Reachback in Admin menu ..............................................................25
Figure 29: Spectral Data menu ......................................................................................25
Figure 30: Send or view report ......................................................................................25
Figure 31: Status screen................................................................................................28
Figure 32: AutoCal information text ...............................................................................29
Figure 33: Common screen elements on search screens ..................................................30
Figure 34: Dial search screens – gamma only on left, gamma and neutron on right............30
Figure 35: Finder search screen .....................................................................................31
Figure 36: Bars search screen ........................................................................................32
Figure 37: Search screen spectrum – no radiation on left, radiation present on right .........33
Figure 38: Alarm on Dial screen and on Finder screen .....................................................34
Figure 39: Spectra acquisition – Standard on left, Simple on right.....................................35
Figure 40: Screen ID of isotopes – Ba-133, Co-57, Co-60, and Mn-54 ................................36
Figure 41: Report screen (top section on left, scroll down center and right) ......................37
Figure 42: RIIDView screen ...........................................................................................39
Figure 43: AutoCal complete message............................................................................40
Figure 44: Collecting background - instructions to remove sources...................................40
Figure 45: Collecting background – typical spectrum .......................................................41
Figure 46: AutoCal screens – startup on left, complete on right........................................46
Figure 47: AutoCal paused ............................................................................................47

Figures
Thermo Scientific 12/22/2016 RIIDEye DB-099E Operator Manual x
Figure 48: Field Settings menu and Coarse Calibrate selection screen ...............................48
Figure 49: Coarse Calibrate source placement dialog.......................................................48
Figure 50: Coarse Calibrate collecting data .....................................................................48
Figure 51: Keypad and location of the MENU button ........................................................51
Figure 52: Moving through the menu headers ................................................................52
Figure 53: Moving through the menu and values ............................................................53
Figure 54: Slider adjustments and static options .............................................................54
Figure 55: Spectral Data menu ......................................................................................55
Figure 56: Spectrum Search Criteria submenu ................................................................56
Figure 57: Select Spectra submenu ................................................................................56
Figure 58: Review mode of spectra ................................................................................57
Figure 59: User's Field Settings menu.............................................................................57
Figure 60: Self Test report.............................................................................................59
Figure 61: Administrator Configuration menu.................................................................60
Figure 62: Setting date and time....................................................................................61
Figure 63: Help menu ...................................................................................................62
Figure 64: Admin menu ................................................................................................63
Figure 65: Access Controls submenu ..............................................................................63
Figure 66: Changing password.......................................................................................67
Figure 67: Generic timeout screen .................................................................................71
Figure 68: Low ID counts text ........................................................................................72
Figure 69: Relative response of gamma dose rate, ambient equivalent, H*(10),
RIIDEye X-G and -X-GN .................................................................................................81

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Thermo Scientific 12/22/2016 RIIDEye DB-099E Operator Manual xi
Tables
Table 1: Color meanings ...............................................................................................11
Table 2: Count Rate information....................................................................................11
Table 3: Nuclide classes color codes...............................................................................11
Table 4: User overview .................................................................................................14
Table 5. Legend of report's line items ............................................................................38
Table 6. Three-steps concept ........................................................................................42
Table 7. Calibration methods ........................................................................................45
Table 8. Moving through the menu headers ...................................................................52

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Thermo Scientific 12/22/2016 RIIDEye DB-099E Operator Manual xii
Preface
The RIIDEye™ is a portable Radio-Isotope Identification Device (RIID) that detects
and identifies multiple nuclides, providing quantified results using time-slice
analysis.
This manual describes the functionality and operation of the RIIDEye.
Manual Conventions
This manual uses the following typographic conventions:
Identify, User Soft key names are shown in bold mixed case.
New background is recommended Messages and on-screen prompts are shown in
italics.
ENTER,MENU,UPKeypad key names are shown in small capital letters.
Related Documentation
In addition to this guide, Thermo Fisher Scientific provides the following documents
for RIIDEye:
•RIIDEye Quick Start Guide (COMD000687)
Safety and Special Notices
Make sure you follow the precautionary statements presented in this guide. The
safety and other special notices appear in boxes.
Safety and special notices include the following:
CAUTION Highlights hazards to humans, property, or the environment. Each
CAUTION notice is accompanied by an appropriate CAUTION symbol.
IMPORTANT Highlights information necessary to prevent damage to software, loss
of data, or invalid test results; or might contain information that is critical for
optimal performance of the system.
Note Highlights information of general interest.

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Thermo Scientific 12/22/2016 RIIDEye DB-099E Operator Manual xiii
Tip Highlights helpful information that can make a task easier.
Safety Instructions
CAUTION Use RIIDEye instruments only within their specified measurement range
and operational limits. Using an instrument in exceeding conditions may cause
malfunction of the device.
CAUTION Do not use the instrument in an explosive atmosphere.
CAUTION Do not use the instrument if a critical error message appears on the
screen.
CAUTION Maintain the mechanical integrity of a RIIDEye instrument at all times
with the exception of the connections described below for external devices such as
the DC power supply and data exchange interfaces.
CAUTION Only charge the RIIDEye’s battery pack inside the RIIDEye device with the
supplied battery charging equipment and only if the pack contains rechargeable
batteries.
CAUTION You can operate the RIIDEye using non-rechargeable alkaline batteries
but you must not charge the device when these batteries are installed.
CAUTION Radioactive objects found or identified with RIIDEye instruments may
emit hazardous levels of radiation. Never use the displayed dose rate value to
estimate hazards to exposed persons.
Note Thermo Fisher Scientific shall not be taken accountable for any displayed
data such as nuclide identification information. This applies also for actions taken as
consequence of the displayed information.

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Thermo Scientific 12/22/2016 RIIDEye DB-099E Operator Manual xiv
Contacting Us
There are several ways to contact Thermo Fisher Scientific for the information you
need.
To contact Technical Support for North and south America and Canada
Phone [phone]
International 508-553-1700 (International, +1)
Support Fax [phone]
E-mail [email protected]
Web www.thermo.com
Address Thermo Fisher Scientific RM & SI
One Thermo Fisher Way
Oakwood Village, OH 44146
USA
To contact Technical Support for customers outside of North and South America and Canada
Phone [phone]
Support Fax [phone]
E-mail [email protected]
m
RGA process www.thermoscientific.com/servicerepair
Web www.thermofisher.com
Address Thermo Fisher Scientific Messtechnik GmbH
Frauenauracher Straße 96
D-91056 Erlangen, Germany
Post Address P.O Box 16 60
D-91051 Erlangen, Germany

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Thermo Scientific 12/22/2016 RIIDEye DB-099E Operator Manual 1
Introduction
The RIIDEye can be operated either in a very simple mode requiring no previous
experience (see Quick Reference Guide starting on page 3) or in a more advanced
operating mode that takes advantage of the comprehensive set of advanced
features.
Contents
•About Your RIIDEye
•Quick Reference Guide
•Description of Keypad
•Description of the Soft Keys
•Display Conventions
•Self Test and Status Screen
•User or Administrator Operation
The RIIDEye offers two modes of operation: User and Administrator. User functions
allow first line responders to perform all the tasks needed in the line of duty without
a logon. Administrator functions require a logon and password; they allow a Health
Physicist or other expert to set up the device for specific applications and to perform
additional detection and maintenance functions. This manual will cover aspects of
both, but places an emphasis on User functions. These are discussed in detail in
General Operation on page 27 and Calibration on page 45.
The device powers up in an initial search mode. Several different views of this mode
are available, but all are based on data collected in real time. In addition to the
search modes, you can also access the setup, alarm review, and calibration functions
through the menu system. These are discussed in General Operation on page 27.
The instrument has a simple user interface (described in Description of Keypad on
page 9) and a wide range of setup functions and utilities (described in System Menus
on page 51. Depending on the mode, RIIDEye uses 256 or 512 channel Quadratic
Compression Conversion (QCC), including the saving of spectra. Measurement data
is stored on a Compact Flash (CF) card and formatted in ANSI standard (N42.42-
2006) format for processing on external devices.
About Your RIIDEye
Congratulations on purchasing your new RIIDEye. RIIDEye represents the latest in
portable gamma spectroscopy. Your RIIDEye is designed to detect and identify a

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wide range of gamma radiation (20 keV to 3 MeV). Its reliable design provides
virtually maintenance free operation for five years and a long service life.
RIIDEye units consist of:
•Spectrometer electronics
•Gamma ray detector (underneath the display)
•Optional neutron detector (in the handle)
•Battery pack (installed in the rear end of the instrument)
•AC power adapter
•CF-card USB reader
RIIDEye X-G, order No 42508/80, is the standard instrument using a 2x2” NaI(Tl)
gamma detector with a typical resolution of 7.5% (@662 keV). Its large detector is
excellent for searching for and locating gamma radiation sources. The position of the
gamma detector is marked with a red colored spot at the front of the housing.
RIIDEye X-GN, order No.: 42508/85 offers an internal neutron detector in the handle
of the instrument in addition to the gamma detector. The position of the internal
neutron detector is marked with a blue dot.
RIIDEye X-H, order No. 42508/82, uses a 1.5” Lanthanum Bromide detector and with
its typical 3.0% (@662 keV) energy resolution is especially suitable to identify
multiple nuclides in difficult identification scenarios.
RIIDEye X-HN, order No.: 42508/86, offers an internal neutron detector in the
handle of the instrument in addition to the Lanthanum Bromide detector. The
position of the internal neutron detector is marked with a blue dot.
Figure 1. RIIDEye X
What’s in the Box
Your RIIDEye X comes with a suite of accessories to meet your mission. Below is a list
of components that ship with RIIDEye X:
1. Hard sided case that stores all components for RIIDEye – Case is suitable for
transportation and adds further shock protection to the RIIDEye.

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2. RIIDView SW – Software that allows offline viewing and reporting of
spectrum
3. RIIDEye Reachback cable – Cable that facilitates Reachback through USB and
Satellite phone (optional)
4. RIIDEye PC Interface cable – Cable that facilitates data push from RIIDEye to
PC
(optional)
5. Battery charging cable and AC/DC power converter
6. USB memory reader for Compact Flash cards
7. Shoulder Strap
8. Quick Start Guide (COMD000687)
9. RIIDEye Operator manual (DB-099E)
Quick Reference Guide
Getting Ready
Before using the RIIDEye for the first time, we highly recommend that you backup
the contents of the CF card completely, charge the battery to 100%, and setup an
Administrator password.
Backing up the CF Card
To backup the CF card, do the following:
1. Locate the access panel at the back of the unit (see Figure 16 on page 16).
Turn the thumb screw lock on the access panel a quarter turn counter
clockwise to unlock. Remove the access panel.
2. With the unit turned off, remove the CF card and backup the contents
completely using the supplied USB adapter, a PC, and Windows™ Explorer;
store the files in a safe place.
3. Re-insert the CF card (see Figure 2 for correct orientation).
4. Replace and lock the access panel by turning the thumb screw a quarter turn
clockwise.
Figure 2. CF card orientation
For additional information, see Compact Flash Card on page 19.

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Loading and Charging the Batteries
You can charge the rechargeable battery pack inside the RIIDEye unit using the AC
adapter supplied with the instrument. Although you can operate the RIIDEye while
the batteries are charging, the necessary charging time will be longer.
1. Connect the AC charger (see Figure 16 on page 16) and plug the charger into
a wall outlet.
2. To confirm that the unit is fully charged, power-up the device (see Starting-
up below) and watch for the battery charging bars to change to the AC
mains symbol
(), which indicates a full charge.
For additional information, see Connecting AC Power on page 16.
Starting-up
To turn on the RIIDEye, press and hold down the BACK/POWER key for at least one
second. Release when the Status screen displays (Figure 3). You will hear the
"welcome" sound during this start-up phase.
Note New units come with no password, which must be entered by an
administrator or expert user. With no password, the unit automatically boots up in
Administrator mode (see User or Administrator Operation on page 14. With a
password, the system automatically boots up in User mode. In either case, the unit
displays the Dial search screen (Figure 3).
Figure 3: Status screen followed by Dial screen
The User-mode Dial search screen displays the AutoCal progress. This may take 1-3
minutes and up to four passes to resolve in high background areas.
If the text message “New background is recommended” appears on the screen
during or after the auto calibration process, then initiate a background procedure by
using the Background soft key function (see Figure 4). Use the keypad to highlight
Background and then press the BACK/POWER key . Always collect a new background
before you start scanning.
CAUTION Wait until AutoCal is 100% complete before taking a new
background.

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Figure 4. Soft key control showing Background, Identify, and Finder
Basic Operation
The right-most soft key “Finder/Bars/Spectrum/Dial” lets you select between the
available search modes. Figure 5 shows the order in which each screen displays.
Pressing the BACK/POWER key key selects the highlighted soft key. Pressing
BACK/POWER repeatedly will scroll through the search screens.
Note The “Bars” and “Spectrum” modes are not available in the User mode
according to the factory setting. They must be enabled by an administrator to be
accessible by a user.

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Figure 5: Available search modes
Dial Mode
The Dial provides count rate information in the form of a speedometer. When
radioactive material gives an indication in the green region, the intensity of the
source is sufficient to allow identification with gamma and neutron count rates (with
optional neutron counter). The other colored regions indicate that the source is
either too far (gray) or too close (red).
Figure 6: Dial mode, signal strength