Ludlum Model 44-7
Alpha, Beta, Gamma GM Detector
Part Number 47-1536

INDICATED USE: Alpha, beta, gamma survey; sample counting
DETECTOR: End window halogen quenched GM
WINDOW: 1.7 + 0.3 mg/cm² mica
WINDOW AREA: 6 cm² active; 5 cm² open
EFFICIENCY (4pi): 2%-¹⁴C; 10%-⁹⁰Sr/⁹⁰Y; 7%-⁹⁹Tc; 7%-²³⁹Pu
SENSITIVITY (¹³⁷Cs gamma): 2100 cpm/mR/hr
ENERGY RESPONSE: Energy dependent
BACKGROUND: 40 cpm
DEAD TIME: 250 microseconds
OPERATING VOLTAGE: 900 volts
CONSTRUCTION: Anodized aluminum housing
SIZE: 1.8" diameter x 5.8" L (4.6 x 14.7 cm)
WEIGHT: 1 lb (0.5 kg)

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