Ludlum Model 44-9-18
Alpha, Beta, Gamma GM Detector
Part Number  47-2940

INDICATED USE: Alpha, beta, gamma survey; sample counting
DETECTOR: Pancake type halogen quenched GM
WINDOW: 1.7 + 0.3 mg/cm² mica
WINDOW AREA: 15 cm² active, 12 cm² open
EFFICIENCY (4pi): 5%-¹⁴C; 22%-⁹⁰Sr/⁹⁰Y; 19%-⁹⁹Tc; 32%-³²P; 15%-²³⁹Pu
SENSITIVITY (¹³⁷Cs gamma): 3300 cpm/mR/hr
ENERGY RESPONSE: Energy dependant
BACKGROUND: 60 cpm
DEAD TIME: 80 microseconds
OPERATING VOLTAGE: 900 volts
CONSTRUCTION: Painted aluminum housing
SIZE: 1.8" H x 2.7" W x 23" L (4.6 x 6.9 x 58.4 cm) 36" fully extended
WEIGHT: 1.5 lb (0.7 kg)

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