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Radiation Therapy Area Monitor, Model 375/2

Radiation Therapy Area Monitor, Model 375/2
Radiation Therapy Area Monitor, Model 375/2
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Radiation Therapy Area Monitor, Model 375/2


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Radiation Therapy Area Monitor, Model 375/2



  • Affordable Area Monitor

  • Easy Setup and Use

  • Internally Mounted, Energy Compensated GM Detector

  • Operating Range: 1µSv/h-10 mS/h (0.1 mR/hr-1 R/hr)

  • User-Programmable Alarms

  • User-Programmable Units of Measurement

  • Integrated Design

  • Built-in Rechargeable Backup Battery Backup

  • Networkable

  • Audio & Visual Alarms

  • 48-Hour Battery Backup

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. Audible tones provide additional alerts.

Parameters are protected under a calibration cover. Calibration is easily accomplished by moving the cal DIP switch to the right, and using the push buttons 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.

With the addition of  the optional Remote Display/Annunciator, Item 337-105 or 337-106, the Model 375/2 can be used to provide continuous monitoring of (normal) background radiation in radioactive material preparation and work areas (ie. 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.


Indicated Use: gamma monitoring

Display: 4-digit LED, 0.8" H (2 cm) character height

Display Range: 000.0 to 9999

Operating Range: 1 µSv/h to 10 mSv/h (0.1 mR/hr to 1 R/hr)

Display Units: can be made to display in µR/hr, mR/hr, R/hr, µSv/h, mSv/h, Sv/h, µrem/hr, mrem/hr, rem/hr, cpm, cps, and others

Linearity: readings within 10% of true value with detector connected 

Response: typically 3 seconds from 10% to 90% of final reading


  • Status: (green light) instrument functioning properly

  • Low Alarm: (yellow light and slow [1 per second] beep) can be set at any point from 0.0 to 9999

  • High Alarm: (red light and fast [4 per second] beep) can be set at any point from 0.0 to 9999

  • Det Fail: (red light and audible tone) for conditions of detector overload, no count from detector, or instrument failure

  • Low Bat: (yellow light) indicates less than 2 hours of battery power remaining

  • Overload: display reading of -OL- and audible FAIL alarm indicate detector saturation

  • Over-Range: display reading of “----” and activated low and high alarms indicate that the radiation field being measured has exceeded the counting range of the instrument (or when dead time correction accounts for more than 75% of the displayed reading)

Calibration Controls: accessible from the front of instrument (protective cover provided)

High Voltage: user-adjustable from 450 to 2500 volts

Dead Time: user-adjustable to compensate for dead time of the detector and electronics (can be read off the display)

Audio: can vary from approximately 68 dB to 100 dB through operation of the external rotary baffle and the internal voltage connection

RS-232 Output: a 2-second dump for computer data logging

Power: 9 Vdc wall-mount adapter with four sets of prongs for almost any style wall receptacle

Battery Life: Typically 48 hours in non-alarm condition; 12 hours in alarm condition

Battery Charger: Battery is continuously trickle charged when instrument is connected to line power and turned on

Construction: aluminum housing with ivory powder-coat finish
Temperature Range: -15 to 50 °C (5 to 122 °F); may be certified for operation from -40 to 65 °C (-40 to 150 °F)

Size: 7.4" H x 9.7" W x 2.5" D (18.7 x 24.6 x 6.4 cm)

Weight: 4.7 lb (2.1 kg)


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