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Monitor 4 Radiation Meter

The Monitor 4 Radiation Detector (M4) are compact, general purpose survey meters 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. The monitor senses ionizing radiation by means of a GM (Geiger Mueller) tube with a thin mica window.

The tube is enclosed inside the instrument. When a ray or particle of ionizing radiation enters or passes through the tube, it is sensed electronically and displayed by a red count light. When the switch is in the AUDIO position, the instrument will also beep with each radiation event. About 5 to 25 counts at random intervals (depending on your location and altitude) can be expected every minute from naturally occurring background radiation.

Monitor 4: Halogen-quenched uncompensated GM tube with thin mica window 1.5-2.0 mg/cm2 thick.
Monitor 4EC: Halogen-quenched GM tube, energy compensated sidewall 2mm tin filter. Thin mica window 1.5-2.0 mg/cm2 thick.
Monitor 4 Energy Sensitivity: 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 75% typical detection efficiency. Detects gamma and x-rays down to 10 keV typical through the window, 40 keV minimum through the sidewall of the detector. Normal background is approximately 10-20 CPM.
Gamma Sensitivity: 1000 CPM/mR/hr
Monitor 4EC Energy Sensitivity Same as Monitor 4 except: The energy response for gamma and x-rays through the detector sidewall is flat within +61% or -26% over the range of 40 keV to 100 keV, and within +35% or -17% over the range of 100 keV to 1.3 MeV (referenced to Cs-137)
Range Switch: X1, X10, X100, Battery Check.
Operating Range: 0-.5, 0-5, 0-50 mR/hr and 0-500, 0-5,000, 0-50,000 CPM
Accuracy: ±10% of full scale (referenced to Cs-137).
Audio Indicator: Internally mounted beeper (can be switched off for silent operation).
Anti-Saturation: Meter will hold at full scale in fields as high as 100 times the maximum reading.
Power Requirements: One 9-volt alkaline battery. Battery life is up to 2,000 hours at normal background radiation levels.
Temperature Range: -20° C to 55° C (-4° F to 131° F).
Weight of the Monitor 4: 178 grams (6.3 oz.) without battery
Weight of the Monitor 4EC: 198.1 grams (7 oz.) without battery
Size: 145 x 72 x 38 mm (5.7 x 2.8 x 1.5 inches).
Includes: Carrying Case, 1 year limited warranty, and CE mark
Options: Belt Clip

Energy Sensitivity:

Detects alpha down to 2.5 MeV
Typical alpha 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
Detects gamma and x-rays down to 40 keV minimum through the sidewall
Normal background is approximately 10-20 CPM

Gamma Sensitivity:

1000 CPM/mR/hr (referenced to Cs-137)