Model 44-7 End Window G-M Probe

Ludlum Model 44-7 End Window G-M probe

The Model 44-7 is an end window G-M that can be used with several different instruments including survey meters, scalers, ratemeters, and alarm ratemeters.


Indicated Use Alpha, beta, gamma survey; Sample counting
Detector Type End window, halogen-quenched G-M
Window 2.0 ± 0.3 mg/cm2 mica
Window Area Active: 6 cm2 (0.93 in2)
Open: 5 cm2 (0.78 in2)
Efficiency (4π)
14C: 2%
90Sr/90Y: 10%
99Tc: 7%
239Pu: 7%
125I: 0.1%
Typical Sensitivity
(137Cs gamma) 2100 cpm per mR/hr
Energy Response Energy dependent
Typical Background (10 µR/hr field) 40 cpm
Typical Dead Time 200 μs
Operating Voltage 900 V
Connector Series "C" (others available)
Construction Anodized aluminum housing
Size (D x L) 4.6 x 14.7 cm (1.8 x 5.8 in)
Weight 0.5 kg (1 lb)