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Model 44-89

Alpha-Beta-Gamma Detector

Indicated Use	Alpha, beta, gamma survey
Detector Type	4 pancake type, halogen quenched GMs
Window	1.7 ± 0.3 mg/cm² mica
Window Area	Active: 62 cm² (9.6 in²) Open: 50 cm²(7.8 in²)
Efficiency (4π)	¹⁴C: 5% ⁹⁰Sr/⁹⁰Y: 22% ⁹⁹Tc: 19% ³²P: 32% ²³⁹Pu: 15%
Energy Response	Energy dependent
Typical Sensitivity	13200 cpm per mR/hr
Typical Background (10 µR/hr field)	240 cpm
Operating Voltage	900 V
Construction	Black ABS plastic with stainless steel protective screen
Size (H x W x L)	2.3 x 12.9 x 12.9 cm (0.9 x 5.1 x 5.1 in.)
Weight	0.9 kg (1.9 lb)

Description	Part Number
GM Tube	01-5008
Protective Screen	7241-008

Model	Description	Part Number
44-89-1	Two pancake GM version	47-2918
44-89-3	Four pancake GM straight version	47-3471