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Radiation Alert Monitor 200

    Radiation Alert Monitor 200


    The Monitor 200 measures alpha, beta, gamma, and x-rays. Its digital display shows readings in your choice of CPM, CPS, µSv/hr, mR/hr, or in accumulated counts.

    It has a digital display, a red count light, and a beeper that sounds with each count detected. Other features include an adjustable timer and selectable alert. With the free Observer USB Software Family, you can set computer alarms, calibrate your instrument, and download your collected data from the internal memory for easy reporting!


    Halogen-quenched GM tube with thin mica end window. Mica window density 1.5-2.0 mg/cm2. Effective window diameter is .360 inch. Side wall is .012 inch thick.

    Operating Range

    mR/hr – .001 (1µR) to 200 mR/hr
    µSv/hr – .01 to 2000
    CPM – 0 to 214,000
    CPS – 0 to 3575
    Total Counts – 1 to 9,999,000 counts


    Typically ±15% from factory, ±10% (NIST)

    Energy Sensitivity

    1070 CPM/mR/hr referenced to Cs137
    Detects alpha down to 2.5 MeV; typical detection efficiency at 3.6 MeV is greater than 80%.
    Detects beta at 50 keV with typical 35% detection efficiency.
    Detects beta at 150 keV with typical 75% detection efficiency.
    Detects gamma and x-rays down to 10 keV typical through the window, 40 keV minimum through the case.


    Readout will OVERRANGE in radiation fields as high as 100 times the maximum reading.


    Pulsating beeper sounds the alert.


    Graphic LCD with Backlight.

    Count Light

    Red LED flashes with each count.

    Audio Indicator

    Sounds with each count (can be switched off for silent operation)


    USB for use with Observer USB Software Family

    Power Requirements

    Two AA alkaline batteries (included)


    140 X 68 X 33 mm (3.5 X 2.7 X 1.3 in.)