The MONITOR 4 and MONITOR 4EC 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 4EC offers a more accurate linear reading for gamma and x-rays (above 40 keV).

Specifications:

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.

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