Monitor 4EC

Monitor 4EC


Monitor 4EC

Monitor 4EC

Monitor 4 Radiation DetectorThe Monitor 4EC is an energy compensated, ergonomic radiation survey meter capable of detecting alpha, beta, gamma, and x-rays over 3 selectable ranges. This detector is great for getting a linear response to gamma and x-ray. A red count light flashes and a beep sounds with each event detected. The Monitor 4EC offers a linear response for gamma and x-rays (above 40 keV).

Applications & Uses: Checking accelerator & x-ray shielding for leakage, Linear Response needs with Energy Compensation, Checking industrial gauges, such as moisture, density, or level gauges containing Cesium-137, Locating Sources, Personal protection, General surveying


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 or 0-5, 0-50, 0-500 μSv/hr (SI Scale Meter Option)

Energy Sensitivity

1000 CPM/mR/hr (Cs137). 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 and beta at 150 keV with typical 75% detection efficiency. Detects gamma and x-rays down to 10 keV typical through the window (non-compensated), 40 keV through the sidewall.


Typically ±15% of reading (Cs137)

Monitor 4EC Energy Response Graph

Audio Indicator

Internally mounted beeper (can be turned off for silent operation).

Range Switch

X1, X10, X100, Battery Check.


Analog Meter holds full scale in fields as high as 100X maximum reading. CPM & mR/hr scale. Optional SI Scale Meter Available




Headphone, 3.5 mm jack with pulse out.


Carrying Case w/ Belt Clip


SI Meter Option, Observer Software

Limited Warranty

1 year limited warranty

Power Requirements

9-volt alkaline battery (included). Approx. 2,000 hrs. at normal background

Temperature Range

-20° to 55°C (-4° to 131°F)


M4: 200 g (7.1 oz) M4EC: 224 g (7.9 oz)


3.5 mm jack with pulse out.


209 x 71 x 50 mm (8.2 x 2.8 x 1.9 in.)

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