Monitor 4 and Monitor 4EC Compact Portable Analog Radiation Detectors

The Monitor 4 and Monitor 4EC are compact, ergonomic, general purpose analog radiation detectors / survey meters suited to the detection of alpha, beta, gamma and X-rays. They offer three detection ranges to suit most applications.

In addition to the analog meter, these units also offer visible and audible assistance via a blinking count light and beeping sound that correspond to the detection of an event.

The Monitor 4EC provides a more linear reading for gamma and X-rays above 40keV.

Detectors

  • Monitor 4 – Halogen-quenched uncompensated GM tube with thin mica window 1.5-2.0 mg/cm2 thick. Effective diameter of window is 9.1 mm (.36 in.).
  • Monitor 4EC – Halogen-quenched GM tube, energy compensated sidewall 2mm thin filter. Thin mica window 1.5-2.0 mg/cm2 thick. Effective diameter of window is 9.1 mm (.36 in.).

Operating Range

  • 0-.5, 0-5, 0-50 mR/hr
  • 0-500, 0-5,000, 0-50,000 CPM
  • 0-5, 0-50, 0-500 μSv/hr (SI Scale Meter Option)

Energy Sensitivity

1000 CPM/mR/hr (Cs137)

M4EC is the same as M4 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.

Monitor 4 and Monitor 4EC detect beta at 50 keV with typical 35% detection efficiency and beta at 150 keV with typical 75% detection efficiency.

Accuracy

Typically ±15% of reading (Cs137)

Specifications

PropertyValue
Audio indicatorInternally mounted beeper
Power requirements9V alkaline battery.
Approx. 2000hrs at background
Temperature range-20 to 55°C
OutputsHeadphone 3.5mm jack to log counts to computer or datalogger
WeightMonitor 4 - 200g
Monitor 4EC - 224g
Size209 x 71 x 50mm
IncludesCarrying case with belt clip
OptionsSI meter option
Observer software
NIST calibration
SE International Monitor 4 Energy Response Graph

Monitor 4 – Detects alpha down to 2.5 MeV; typical detection efficiency at 3.6 MeV is greater than 80%. Detects gamma and x-rays down to 10 keV typical through the window, 40 keV minimum through the case.

SE International Monitor 4EC Energy response graph

Monitor 4EC – Detects alpha down to 2.5 MeV; typical detection efficiency at 3.6 MeV is greater than 80%. Detects gamma and x-rays down to 10 keV typical through the window (non-compensated), 40 keV through the sidewall.

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