Radiation Survey Meter, Alpha, Beta, Gamma and X-rays



Monitor 4, Radiation Alert Quality Handheld Detector This is a general purpose survey meter capable of detecting alpha, beta, gamma, and x-rays over 3 selectable ranges.  A red count light flashes and a beep sounds with each event detected. Specifications:

  • Detector: Halogen-quenched uncompensated GM tube with thin mica window 1.5-2.0 mg/cm2 thick.
  • Display: Analog Meter holds full scale in fields as high as 100X maximum reading.
  • Monitor 4 Energy Sensitivity: Detects alpha down to 2.5 MeV; typical detection efficiency at 3.6 MeV > 80%.
    Detects beta at 50 keV with 35% efficiency.  Detects beta at 150 keV with 75% efficiency.  Detects gamma and
    x-rays down to 10 keV through the window, 40 keV minimum through the sidewall.  Normal background is approximately 10-20 CPM.
  • Battery: Comes complete with 9V battery
  • Calibration: Calibrated for 12 months from date of sale


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