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Radiation Alert Monitor 4

Release Time:  6/12/2017 16:24:38  Source:  Buu

Radiation Alert Monitor 4

The M4 and M4EC arecompact, ergonomic, general purpose survey meters capable of detecting alpha,beta, gamma, and x-rays over 3 selectable ranges. A red count light flashes anda beep sounds with each event detected. The Monitor 4EC offers a more linear readingfor gamma and x-rays (above 40 keV). Monitor 4 & 4EC QuickSpecs PDF


Monitor 4:

Halogen-quencheduncompensated 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 GMtube, energy compensated sidewall 2mm thin filter. Thin mica window 1.5-2.0mg/cm2thick. Effective diameter of window is 9.1 mm(.36 in.).

Operating Range

0-.5, 0-5, 0-50 mR/hr0-500, 0-5,000, 0-50,000 CPM or 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 throughthe detector sidewall is flat within +61% or -26% over the range of 40 keV to100 keV, and within +35% or -17% over the range of 100 keV to 1.3 MeV. M4 &M4EC meter scales shown below.
Both Detect beta at 50 keV with typical 35% detection efficiency and beta at150 keV with typical 75% detection efficiency.


Typically15% of reading (Cs137)


Range Switch

X1, X10, X100, BatteryCheck.


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

Audio Indicator

Internally mountedbeeper (can be turned off for silent operation).

Power Requirements

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

Temperature Range

-20 to 55C (-4 to131F)


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


3.5 mm jack with pulseout.


209 x 71 x 50 mm (8.2 x2.8 x 1.9 in.)


Carrying Case w/ BeltClip


SI Meter Option, Observer Software

Limited Warranty

1 year limited warranty

Monitor 4 Kits

Build your own Monitor4! Learn about how a geiger counter works!


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