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
Detector Type
Detector Code
Range
D
eep
–
G
a
mm
a
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
D
eep
–
N
e
u
tr
o
n
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.