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 ?Sv/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.

Similar Products

Frisker
Handheld Radiation Detector

Frisker radiation monitor form SE International

Ranger
Handheld Radiation Detector

Ranger radiation monitor form SE International

Related Products

No menu locations found.