Energy Compensated GM.  The Standard probe for transportation surveys.

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APPLICATION: beta gamma radiation survey

RADIATION DETECTOR: 30-45 mg/cm² stainless steel wall halogen quenched GM

DETECTION RANGE: ±10% up to 50 mR/hr without DTC and up to 500 mR/hr with DTC
SENSITIVITY: 1200 cpm/mR/hr (¹³⁷Cs gamma) with window closed

BACKGROUND: 20 cpm closed; 25 cpm open

ENERGY RESPONSE: ±15% of true value from 50 keV-1.25 MeV
BETA CUT OFF: approximately 200 keV (window open)
DEAD TIME: typically 95 microseconds
OPERATING VOLTAGE: 900 volts
COMPATIBLE INSTRUMENTS: general purpose radiation survey meters, ratemeters and scalers

CONNECTOR: series “C”
CONSTRUCTION: anodized aluminum housing

SIZE: 1.3 x 6.5 in. (3.3 cm x 16.5 cm) (Dia x L)
WEIGHT: 1 lb (0.5 kg)