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800-620-8803 
Ludlum Model 44-89 GM Detector
Specifications
INDICATED USE: alpha, beta, gamma survey
SUGGESTED INSTRUMENTS: general purpose survey meters, ratemeters, and scalers
DETECTOR: 4 pancake-type, halogen quenched GMs
SENSITIVITY: typically 13200 cpm/mR/hr
BACKGROUND: 240 cpm
WINDOW: 1.7 + 0.3 mg/cm² mica
WINDOW AREA: 62 cm² (9.6 in²) active; 50 cm² (7.8 in²) open
EFFICIENCY (4π): 5% for 14C; 22% for 90Sr/90Y; 19% for 99Tc; 32% for 32P; 15% for 239Pu
ENERGY RESPONSE: energy dependent
OPERATING VOLTAGE: 900 volts
CONSTRUCTION: black ABS plastic with stainless steel protective screen
SIZE: 2.3 x 12.9 x 12.9 cm (0.9 x 5.1 x 5.1 in.) (H x W x L)
WEIGHT: 0.9 kg (1.9 lb)
