MBD-2 Operating Manual 8
15-00167, Rev 1
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
0.01 cGy – 14 cGy Cf-252 Moderated
0.01 cGy – 36 cGy Cf-252 Unmoderated
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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