OPERATING MANUAL
MBD-2 (IM-278/U)
Personal Dosimeter
Document # 15-00167
Revision 1
December 2018
Table of Contents
1. Preparation for Storage or Shipment .................................................................................................... 5
2. Introduction ............................................................................................................................................ 6
3. Description ............................................................................................................................................ 6
3.1 Physical Desc r iption .......................................................................................................................... 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 Dos imeter 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 Displa y ......................................................................................................... 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 S t atement
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 us ed in acc or dance w ith the instr uct ions, 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
o If 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 caref ul l y clean ed 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 Descri ption
The MBD-2 personal dosimeter system is designed to be worn on the wrist w ith 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 LC D dis play, 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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1. LCD Display
3. C-Ring (2) for Wrist strap
2. Screen Protector and Label
4. Battery Compartment Cover
Figure 1: MBD-2 Personal Dosimeter System
Figure 2: MBD-2 Physical Features
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Figure 3: MBD-2 Board with Detector Placement (relative to case)
Detector Type
Detector Code
Range
Deep
Gamma
DIS High Range
DH
0.1 cGy – 600 cGy
Deep
Neutron
ɣ+ n DIS
NL
0.001 cGy – 60 cGy
ɣ DIS
NG
0.001 cGy – 60 cGy
0.01 cGy – 14 cGy Cf-252 Moderated
0.01 cGy – 36 cGy Cf-252 Unmoderated
Tactical Pin Diode
NA
0.001 – 1250 cGy
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
DIS Low Range DL 0.001 cGy – 60 cGy
–
Tactical MOSFET DA 1 cGy – 2500 cGy
–
Calculational Neutron Dose NG/NL
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 configurati on. 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 malfunc tion, 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 eas y 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 app ears wor n.
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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