Mirion Technologies MBD-2 User manual

OPERATING MANUAL
MBD-2 (IM-278/U)
Personal Dosimeter
Document # 15-00167
Revision 1
December 2018

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Table of Contents
1. Preparation for Storage or Shipment....................................................................................................5
2. Introduction............................................................................................................................................6
3. Description ............................................................................................................................................6
3.1 Physical Description..........................................................................................................................6
4. Operation...............................................................................................................................................8
4.1 Principle of Operation........................................................................................................................8
4.2 Installing the Wrist Strap...................................................................................................................9
4.3 Batteries ..........................................................................................................................................11
4.3.1 Removal/Replacement of the Main Battery ................................................................................11
4.3.1.1 Main Battery Replacement......................................................................................................11
4.3.1.2 Battery Display Indications:.....................................................................................................13
4.4 Start-up and Diagnostics.................................................................................................................15
4.4.1 Start-up........................................................................................................................................15
4.4.2 Diagnostics..................................................................................................................................15
4.4.3 Operation.....................................................................................................................................16
4.4.4 Display Messages.......................................................................................................................16
5. Reading Data from the MBD-2............................................................................................................17
6. Maintenance........................................................................................................................................17
6.1 O-Ring.............................................................................................................................................17
6.1.1. Inspection and Replacement.......................................................................................................17
6.2 Internal Battery (Detector & RTC) Replacement.............................................................................18
6.3 C-Rings ...........................................................................................................................................20
7 Troubleshooting ..................................................................................................................................22
7.1 Display Messages...........................................................................................................................22
7.1.1 Display Messages: Problems and Resolutions...........................................................................22
7.1.2 Parameter Error Codes: Problem and Resolution ......................................................................23
8. Technical Specifications......................................................................................................................27
8.1 Radiological Characteristics............................................................................................................27
8.2 Physical Characteristics..................................................................................................................27
8.3 Environmental Characteristics ........................................................................................................27
8.4 Electrical Characteristics.................................................................................................................27
9. Parts....................................................................................................................................................28
10. Dimensional Drawing ......................................................................................................................29

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List of Figures
Figure 1: MBD-2 Personal Dosimeter System..............................................................................................7
Figure 2: MBD-2 Physical Features..............................................................................................................7
Figure 3: MBD-2 Board with Detector Placement (relative to case).............................................................7
Figure 4: MBD-2 Wrist Strap.........................................................................................................................9
Figure 5: Wrist Strap Orientation & Assembly ..............................................................................................9
Figure 6: Preparing the Wrist Strap ............................................................................................................10
Figure 7: Donning the MBD-2 and Securing the Wrist Strap......................................................................10
Figure 8: MBD-2 Battery Cover Removal ...................................................................................................11
Figure 9: O-Ring Location...........................................................................................................................11
Figure 10: MBD-2 Battery Compartment and Markings..............................................................................12
Figure 11: MBD-2 Correctly Installed Battery Position ...............................................................................12
Figure 12: MBD-2 and Main Battery Cover Thread Stops..........................................................................13
Figure 13: Battery Power Icon ....................................................................................................................13
Figure 14: MBD-2 with Active Display.........................................................................................................16
Figure 15: MBD-2 with O-Ring Removed ...................................................................................................18
Figure 16: MBD-2 without O-Ring and Inspection ......................................................................................18
Figure 17: MBD-2 with Installed O-Ring .....................................................................................................18
Figure 18: Internal Battery Cover and Compartment..................................................................................19
Figure 19: Installing the Internal Battery Cover...........................................................................................20
Figure 20: C-Ring Removal.........................................................................................................................21
Figure 21: C-Ring Replacement ................................................................................................................21
Figure 22: MBD-2 Replacement Parts........................................................................................................28
List of Tables
Table 1: MBD-2 Detector and Range Table..................................................................................................8
Table 2: MBD-2 Battery Icon Segments .....................................................................................................13
Table 3: MBD-2 Battery Display Messages................................................................................................14
Table 4: MBD-2 Start-up & Diagnostics......................................................................................................15
Table 5: MBD-2 Display Messages.............................................................................................................16
Table 7: Display Message Table.................................................................................................................22
Table 8: Parameter Error Code Table.........................................................................................................23

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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.
Modifications: Any modifications made to this device that are not approved by Mirion Technologies Oy
may void the authority granted to the user by the FCC to operate this equipment.
Note: This equipment has been tested and found to comply with the limits for a Class B digital device,
pursuant to Part 15 of the FCC Rules. These limits are designed to provide reasonable protection against
harmful interference in a residential installation. This equipment generates, uses and can radiate radio
frequency energy and, if not installed and used in accordance with the instructions, may cause harmful
interference to radio communications. However, there is no guarantee that interference will not occur in a
particular installation. If this equipment does cause harmful interference to radio or television reception,
which can be determined by turning the equipment off and on, the user is encouraged to try to correct the
interference by one or more of the following measures:
•Reorient or relocate the receiving antenna.
•Increase the separation between the equipment and receiver.
•Connect the equipment into an outlet on a circuit different from that to which the receiver is
connected.
•Consult the dealer or an experienced radio/television technician for help.
Precautions concerning the use of 3V Lithium
Batteries
•Do not attempt to recharge or reenergize batteries.
•Exhausted batteries immediately shall be removed as soon as practical to prevent damage from
leaking batteries
oIf batteries have leaked (dry or wet white residue), use personnel protective equipment such as
hand and eye protection to remove and clean.
•Do not dispose of batteries in fire.
•Do not dismantle batteries.

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1. Preparation for Storage or
Shipment
The following procedure is to be used if your MBD-2 must be stored or shipped for any
reason. First, remove the main battery (Section 3.2.1.1). Pack the complete MBD-2 along
with the proper maintenance documentation and turn it in to your Property Book Officer
(PBO) for shipment. PBO confirms the MBD-2 is packed properly.
1.1 Preparation for Long Term Storage
In hot, humid climates, the MBD-2 should be carefully cleaned with a small amount of
isopropyl alcohol on a clean cloth to remove any skin oils that could support fungal growth.
Wipe down all visible surfaces.

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2. Introduction
The MBD-2 Personal Dosimeter is a device which incorporates the benefits of passive
radiation detection with active, self-reading and recording functionality. The MBD-2 has no
pushbuttons, switches, speaker, or LED and requires no user intervention for operation. The
MBD-2 is pre-configured for rapid issue from storage. The battery powered device includes
on-board digital processing to provide a self-reading, accurate and reliable dose
measurement on an integrated, non-reflective LCD display. Battery power level is reported on
the display using an interactive icon found in commercial electronics. Radiation
measurement data is recorded in device memory every 12 hours.
The MBD-2 provides radiation dose information to the wearer in the field. The MBD-2
displays the total deep absorbed dose D(10) (sum of deep gamma and deep neutron) and is
displayed in measurement units of cGy and Gy.
The MBD-2 uses Direct Ion Storage (DIS), Pin Diode and MOSFET detector technology
passive detectors. The passive DIS radiation detectors are continuously responsive to
radiation, with or without the field-replaceable main battery. The internal electronics provide
self-reading measurement display, digital memory, data logging, on-board diagnostic testing
during startup and NFC (Near Field Communication) read-only wireless communication. All
data resides in non-volatile memory for dose-of-record processing so there is no any danger
of losing stored data or configuration settings on main battery failure. The diagnostics
measure and display battery conditions and fault conditions of the device.
The MBD-2 is a sealed device for durability and hardness. There are no serviceable internal
parts. Maintenance parts are accessible and replaceable.
3. Description
3.1 Physical Description
The MBD-2 personal dosimeter system is designed to be worn on the wrist with a 15- inch
hook and loop wrist strap. The MBD-2 can also be worn on the trunk of body (clipped to
lanyard, pocket, etc.). In this use case, the proper MBD-2 orientation is the display facing
away from the body.
The MBD-2 features a non-backlit LCD display, wireless (NFC read-only) communication,
adjustable wristband, and replaceable batteries.
The main battery compartment is accessible through a removable, self-securing battery cover
located on the back of the device. A sealed compartment below the main battery contains
additional batteries used to provide power to the DIS detectors and real-time clock (RTC).
The main battery compartment incorporates an O-ring seal to secure the battery from the
external environment.

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Figure 1: MBD-2 Personal Dosimeter System
Figure 2: MBD-2 Physical Features
Figure 3: MBD-2 Board with Detector Placement (relative to case)
1. LCD Display
3. C-Ring (2) for Wrist strap
2. Screen Protector and Label
4. Battery Compartment Cover

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The MBD-2 includes six separate detector elements:
•Three (3) elements for gamma measurements,
•Three (3) elements for neutron measurements.
Each detector element is listed below in Table 1, MBD-2 Detector and Range Table.
Displayed results including gamma (DA) or neutron (NA) accident detector elements are
provided in centigray (cGy) measurement units.
Table 1: MBD-2 Detector and Range Table
Detector Type
Detector Code
Range
Deep
–
Gamma
DIS Low Range DL 0.001 cGy – 60 cGy
DIS High Range
DH
0.1 cGy – 600 cGy
Tactical MOSFET DA 1 cGy – 2500 cGy
Deep
–
Neutron
ɣ+ n DIS
NL
0.001 cGy – 60 cGy
ɣ DIS
NG
0.001 cGy – 60 cGy
Calculational Neutron Dose NG/NL
0.01 cGy – 14 cGy Cf-252 Moderated
0.01 cGy – 36 cGy Cf-252 Unmoderated
Tactical Pin Diode
NA
0.001 – 1250 cGy
4. Operation
4.1 Principle of Operation
When the main battery is installed, the MBD-2 will power on, activate the LCD display,
initialize and perform diagnostics and operate according to its configuration. See Section
4.4.2.
During operation, the MBD-2 continuously displays total absorbed dose (as measured),
battery status and periodic self-diagnostic checks. In the event of a device malfunction, an
error message will be displayed on the LCD as shown in Section 4.4.4, Common Display
Messages.
The MBD-2 will alert the wearer to the status of battery life by display battery icon and
message, as shown in Section 4.3.1.3, Battery Display Indication.
When the main battery is depleted or removed, the MBD-2 detector elements continue to
respond to a radiation field. The detector elements remain active as they are powered by two
internal batteries. When restoring the main battery power, the MBD-2 will display the dose
measurement(s) including any exposure received during the time it was without main battery
power, however, the internal history will not account for the date and time of the
measurements while the main battery power was off.

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4.2 Installing the Wrist Strap
The Wrist Strap is a simple, durable accessory for affixing the MBD-2 to a wrist. The Wrist
Strap uses hook and loop material with a C-shaped ring to facilitate easy donning and
securing to an outer garment sleeve.
a. Inspect the Wrist Strap seams for visibly loose stitching and frayed edges. Set aside any
Wrist Strap that appears worn.
Figure 4: MBD-2 Wrist Strap
b. Install the Wrist Strap by feeding the coarse “Hook” end through the bottom (6 o’clock
position) C-ring.
c. Loop the Wrist Strap through C Rings in the orientation as shown below – smooth side
facing away from the back case as shown in Figure 5: Wrist Strap Orientation and
Assembly.
Figure 5: Wrist Strap Orientation and Assembly

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d. Feed the Wrist Strap through its own ring to form a loop as shown below.
e. Pull the strap all the way through until it stops at the black metal loop. Feed the course
hook end back though the metal loop as shown below in Figure 6,Preparing the Wrist
Strap.
Figure 6: Preparing the Wrist Strap
f. Insert hand through the loop, pull the strap around itself and securely fasten as shown
below in Figure 7, Donning the MBD-2 and Securing the Wrist Strap
Figure 7: Donning the MBD-2 and Securing the Wrist Strap
E
F

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4.3 Batteries
4.3.1 Removal/Replacement of the Main Battery
4.3.1.1 Main Battery Replacement
a. Prior to replacing the battery, remove the wristband from at least one C-Ring so that the
battery cover is accessible.
NOTE: Battery change should not take place under direct rain-like conditions as water inside
the battery compartment may cause premature battery discharge.
b. Turn the battery cover counter-clockwise to remove.
Figure 8: MBD-2 Battery Cover Removed
c. Verify the presence of the O-Ring. Inspect for integrity. See Section 6, Maintenance, for
additional O-Ring information.
Figure 9: O-Ring Location
d. Remove the main battery
e. Dispose the used battery in accordance with site requirements.

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Figure 10: MBD-2 Battery Compartment and Markings
f. The battery compartment features imprints of battery orientation and model number.
g. Insert a new battery (Model CR2450, Renata brand preferred) into the compartment,
positive (+) side facing up, as shown below in Figure 11, MBD-2 Correctly Installed
Battery Position.
Figure 11: MBD-2 Correctly Installed Battery Position
h. Confirm the presence of the O-ring prior to installing the battery cover. Ensure the O-Ring
is not twisted, warped or worn and that it lays flush on the surface flange. Refer to
Section 6.1,O-Ring for guidance.
i. Install the battery cover by turning clockwise.
The MBD-2 case and battery cover are designed with thread stops, as shown below in
Figure 12, MBD-2 and Main Battery Cover Thread Stop, to prevent wear and stripping
of the threads and also ensure a secure fit.
When installed and turned clockwise, the battery cover will stop in place when the thread-
stop is engaged.
Battery Orientation:
Positive (+) Side Up
Battery Model: CR2450N
(Renata brand recommended)

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Figure 12: MBD-2 and Main Battery Cover Thread Stops
4.3.1.2 Battery Display Indications:
The MBD-2 reports Main Battery power status with a standard battery icon:
Figure 13: Battery Power Icon
The icon segments, as shown below in Table 2, MBD-2 Battery Icon Segments, represent
the following power status:
Table 2: MBD-2 Battery Icon Segments
Segments
Status
Voltage
100% to 51% range Max to 2601 mV
51% to 26% range 2600 to 2401 mV
25% to 1% range 2400 to 2201 mV

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When the battery voltage is below 25% (approximately < 2400 mV), the MBD-2 will report
battery low power status on the display in the following conventions as shown below in Table
3: MBD-2 Battery Display Messages:
Table 3: MBD-2 Battery Display Messages
Battery Display Message Condition
Main PbAtpermanent on display Main Battery exhausted, replace
Detector dbAt cycles display screen
dbAt permanent on display Detector Batteries are critically low (<25%)
Detector Batteries are exhausted, replace
Real-Time Clock No message Change with Detector Batteries
Note: there is no Low Battery message for the Main Battery. The battery icon provides visual
status.

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4.4 Start-up and Diagnostics
4.4.1 Start-up
When the battery is installed, the MBD-2 powers on. There are no switches to power on or off
the MBD-2.
4.4.2 Diagnostics
During start-up, the MBD-2 performs diagnostics and then becomes active with a live display.
Table 4below describes the visual start-up operation:
Table 4: MBD-2 Start-up & Diagnostics
Start-up Operation and Effect LCD Display Indication
All LCD Segments illuminate for 3 seconds
Installed Firmware version (example)
Diagnostics Check OPEr (Operating Mode)
no.Er message indicates no errors have been identified.
If the MBD-2 becomes operational following an Error
during start-up, the PA.Er message will appear on the
Display, indicating an Error was recorded.
Initialization init
Measurement display: Dose Value (measurement value).
The Deep Total value displayed is a sum of the Gamma
and Neutron dose measurements.
NOTE: The MBD-2 may be stored with or without a main battery. When storing with a battery,
background radiation will accumulate dose to the detectors and record data to memory.

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4.4.3 Operation
The default LCD configuration displays Total Deep Dose (sum of Gamma and Neutron) and
cGy measurement units.
Figure 14: MBD-2 with Active Display
4.4.4 Display Messages
The MBD-2 may display messages or characters on the LCD under certain conditions of
operation:
Table 5: MBD-2 Display Messages
Message Condition
Lo.t Operating temperature is below the lower temperature threshold (-10°C)
Hi.t Operating temperature is above the upper temperature threshold (+50°C)
PbAt The Main Battery voltage is exhausted
dbAt The Detector Batteries voltage is low or exhausted
PA.Er A parameter error has been detected.
OF:t
OF:G
OF:n
One or more detectors is over-range or has been saturated
See Section 7, Troubleshooting for Display Message information.

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5. Reading Data from the MBD-2
The MBD-2 is a read-only device. Measurement data that is recorded and stored in the
MBD-2 memory can be transferred using a “smart” reader device (i.e.; smartphone with
software application [“App”]).
Measurement data is saved in MBD-2 resident memory and the newest values over period of
15 days is maintained in the NFC chip memory. The MBD-2 is configured to perform two daily
“reads”, where a dose or measurement record is saved to memory including a date and time
stamp. These records are maintained on the MBD memory and the NFC memory chip until
the space allotment is filled. Once the data is transferred, new data records are recorded into
the available space (i.e.; cyclic memory).
“Instant” data can be transferred from the MBD-2. When a reader device communicates with
the MBD-2 NFC chip, an instant read is initiated and the most current log data recorded will
be transferred with current total dose measurement. This can take place only when there is
dose value given on the display. So during ‘init’ phase or if the main battery is removed /
exhausted, no current dose value is available.
When an external NFC reader device is used, the data is transferred from the dosimeter over
the air in binary format. Using Mirion standard reader application, the results can be sent as
text files and transferred from the Smartphone to a computer for further action.
Data formats and NFC protocol information is available in external documentation.
6. Maintenance
6.1 O-Ring
The O-Ring provides the battery compartment a barrier and protection from moisture and
dust intrusion. The O-Ring should be:
a. Confirmed to be in place whenever the main battery cover is opened
b. Inspected for condition when replacing the main battery.
6.1.1. Inspection and Replacement
a. Remove and inspect the O-Ring for indications of wear and degradation, to include, cuts,
shedding, twisting, or uneven placement.

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Figure 15: MBD-2 with O-Ring Removed
b. Ensure surface area for the O-Ring is clean.
Figure 16: MBD-2 without O-Ring and Inspection
c. Install the O-Ring on the flange. Run a fingertip around the top of the O-Ring to ensure it
is seated properly as shown in Figure 17, MBD-2 with Installed O-Ring below.
Figure 17: MBD-2 with Installed O-Ring
6.2 Internal Battery (Detector & RTC) Replacement
The internal battery cover should be opened only under a controlled environment.
Careful maintenance shall be ensured to prevent:
•misplacement of parts (screws securing the internal battery cover)
•contamination of the battery contact springs, which have direct access to the internal
electronics.
a. Remove the main battery cover and main battery in accordance with Step 3.2.1.1.
b. The Internal battery cover has three “Torx” pattern, size T6 screws.

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c. Remove the screws and set the cover aside on a clean surface.
NOTE: the screws can be withdrawn without removal where the elastomer gasket material on
the battery cover will hold the screw in place permitting removal, thus minimizing the risk of
screw misplacement.
Figure 18: Internal Battery Cover and Compartment
1
Internal Battery Cover
4
Detector Battery CR1025, 2 each
2
Torx (T6) screw 3each
5
Real Time Clock (RTC) Battery, 1 each
3
Main Battery Compartment
6
Battery Orientation Markings
d. Replace two detector batteries and one RTC battery using Model CR1025, Renata
preferred. Ensure battery orientation is Positive (+) side up. The internal battery case
features imprints for battery orientation and model number.
e. Dispose the used batteries in accordance with site requirements.
Note: the detector and real-time clock batteries shall be replaced together during scheduled
maintenance.
WARNING
If the batteries appear to have leaked, i.e.; there is white residue on the battery
and/or internal battery compartment surfaces; use personnel protective
equipment (i.e.; gloves, safety glasses, etc.) as applicable.
1
2
4
5
3
6

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f. Prior to installing the battery cover:
•Inspect the battery cover for cracks.
•Inspect the gasket for wear or missing segments.
g. Install the internal battery cover by positioning over the compartment and installing the
three Torx head screws. The screws are secure when the battery cover is seated and
flush with the case surface as shown below in Figure 19, Installing the Internal Battery
Cover
Figure 19: Installing the Internal Battery Cover
h. Install the main battery in accordance with 3.2.1.1, steps f-h.
6.3 C-Rings
The C-Ring is 1.9mm thick stainless steel ‘C” shaped loop which is affixed to the MBD-2 by
two insertion holes on opposite ends of the device case. The C-Rings are used for attaching
a wrist strap or other accessory. To remove and/or replace the C-Ring:
WARNING
Both detector batteries must be replaced.
WARNING
The internal battery cover must be replaced if there is evidence of damage
and/wear that would preclude protection of the internal batteries.
WARNING
•Do not overtighten the screws as damage can occur to the battery cover and
case threads.
•Use only the prescribed Torx T6 screw, use of screw types will damage the
threads.
•Never use power tools to install the screws.