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Monitor 4 Radiation Detector

The Monitor 4 Radiation Detector (Mon-4) 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.

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
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.
Gamma Sensitivity:	1000 CPM/mR/hr (referenced to Cs-137)
Operating Range:	0-.5, 0-5, 0-50 mR/hr 0-500, 0-5,000, 0-50,000 CPM or 0-500 µSv/hr 0-50 mR/hr.
Range Switch:	X1, X10, X100, Battery Check
Accuracy:	Typically ±15% of reading (referenced to Cs-137)
Audio:	Internally mounted beeper (can be turned off for silent operation)
Power Requirements:	9-volt alkaline battery up to 2,000 hrs at normal background
Temperature Range:	-20° C to 55° C
Weight:	223.9 grams without battery
Outputs:	3.5 mm headphone jack with pulse out
Size:	210 x 70 x 48 mm

Links and Brochures
Download a printer-friendly version of Monitor 4 Radiation Detector
Neutron Probes page Download a printer-friendly version of 503DR information
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