The hand held unit measures alpha, beta, gamma, and x-rays. Its digital display shows readings in your choice of counts per minute (CPM), CPS, μSv/hr, mR/hr, or in accumulated counts. With USB and the included Observer USB Software, you can download your accumulated data from the internal memory, set alarms, and calibrate your instrument!

It uses a Halogen-quenched GM tube with thin mica end window detector. The mica window density is: 1.5-2.0 mg/cm2. Effective window diameter is .360 inch. Side wall is .012 inch thick.

Operating Range:

mR/hr - .001 (1μR) to 200 mR/hr

μSv/hr - .01 to 2000

CPM - 0 to 214,000

CPS - 0 to 3575

Total/ Timer - 1 to 9,999,000 counts

Accuracy

±10% typical (NIST), Typically ±15% of reading.

Energy Sensitivity

1070 CPM/mR/hr referenced to 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.

Detects 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.