MBD-2 Operating Manual
6
15-00167, Rev 1
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.