Radiation Alert Monitor 4

The Monitor 4 is compact, analog radiation detector. A general purpose survey meter capable of detecting alpha, beta, gamma, and x-rays over 3 selectable ranges.

Proven and reliable over decades of use in the industry, the Monitor 4 has evolved into one of the best analog radiation detectors of today. Simple and ergonomic , a red count light flashes and a beep sounds with each count detected. Battery check and silent operation with the flick of your thumb.

Detector

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.).

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)

Range Switch

X1, X10, X100, Battery Check.

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, 40 keV minimum through the case.Monitor 4 Energy Response

Accuracy

Reference to Cs137

Typically ±15% from factory, ±10% with NIST Source Calibration NIST Calibration Additional

Display

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

Weight M4: 200 g (7.1 oz) M4EC: 224 g (7.9 oz) Size 209 x 71 x 50 mm (8.2 x 2.8 x 1.9 in.)