Gamma Area Monitor - Model 375/2
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Introduction

The Model 375/2 Digital Wall-Mount Area Monitor is designed for visibility and ease of use. This monitor incorporates an internally-housed energy compensated GM detector with a range from 1 µSv/h to 10 mS/h (0.1 mR/hr to 1 R/hr). It features a wall-mount chassis and a four-digit LED display that is readable from 9 meters (30 feet) away. Backlit indicators warn of low radiation (yellow), high radiation (red), instrument failure (red), and low battery (yellow), along with an alarm. A green status light is a positive indication of instrument operation.
 
Parameters are protected under a calibration cover. Calibration is easily accomplished by moving the cal dipswitch to the right, and using the pushbuttons to increment or decrement the calibration constant, dead time correction, and alarm point parameters. Parameters are stored in non-volatile memory (retained even with power disconnected). A five-decade logarithmic analog output is provided. A battery backup provides 48 hours of additional use after the primary power is removed.

Medical Applications

With the addition of either of the optional Remote Alarm modules, the Model 375/2 can be used to provide continuous monitoring of (normal) background radiation in radioactive material preparation and work areas such as Nuclear Medicine Hot Labs. The system can also be used for monitoring of Teletherapy (Cobalt) Treatment rooms, notifying personnel that the source is exposed and in-use.

Alternate Instruments

Model 375/4: 10 µSv/hr to 100 mSv/hr (1.0 mR/hr to 10 R/hr)
Model 375-9: Any 5 consecutive decades between 1 µSv/hr to 10 Sv/hr (0.1 µR/hr to 1.0 kR/hr)
Model 375-10:  1.0 µSv/hr to 20 mSv/hr (100 µR/hr to 2.0 R/hr)