DIGILERT 100 SURVEY METER

©JRT Associates 2008

The Digilert 100 Survey Meters measures alpha, beta, gamma, and x-rays. Its digital display shows readings in your choice of counts per minute (CPM) or mR/hr, or in accumulated counts. A red LED flashes and beeper sounds with each count detected and when the radiation reaches a user set alert level.

Detector
Halogen-quenched GM tube with mica end window. Mica window density 1.5-2.0 mg/cm2. Effective window diameter is .360 inch. Side wall is .012 inch thick.

Display
4-digit liquid crystal display with mode indicators. Display updates every 60 sec.

Operating Range
mR/hr: .001 (1 µR) to 100
CPM: 0 to 100,000
Total: 0 to 120,000 counts
Optional - µSv/hr: .01 to 1000

Accuracy
±10% typical (NIST), ±15% maximum.

Energy Response
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.

Gamma and x-rays down to 10 keV typical through the window, 40 keV minimum through the case. Normal background is 5-20 CPM.

Gamma Sensitivity
1000 CPM/mR/hr referenced to
Cs-137