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Model 44-183

Shielded Gamma Detector

Part Number: 47-3758

The Model 44-183 facilitates gamma surveys in high-background environments and in areas where elevated fields are directional. The detector design incorporates lead shielding that results in a 10:1 reduction in sensitivity from gammas entering in any direction but the bottom face.

The dynamic range is greatest with instruments equipped with DTC (Dead Time Correction) resulting in measurements of 10 μSv/h to 100 mSv/h (1mR/hr to 10 R/hr). The detector is a halogen quenched, energy-compensated GM.

The front plate and handle are constructed from aluminum. All exterior surfaces are protected by a durable, splatter-finish, beige colored paint. Reference markings on the detector housing indicate the internal position of the embedded GM tube.

Specifications
Documents

Specifications
Documents

Specifications

Indicated Use	Gamma survey
Detector Type	Energy-compensated GM with lead shielding
Linear Range	*Without DTC: 10 μSv/h to 20 mSv/h (1 mR/hr to 2 R/hr) With DTC:* 10 μSv/h to 100 mSv/h (1 mR/hr to 10 R/hr)
Typical Sensitivity (¹³⁷Cs)	0.17 cps per μSv/h (100 cpm per mR/hr)
Energy Response (60 keV - 3 MeV)	Within 15% of true value
Front to Back Shield Ratio	10 : 1
Typical Dead Time	50 µs
Operating Voltage	550 V (reccomended)
Input Sensitivity	-30 mV ±10 mV
Connector	Series "C"
Construction	Aluminum and lead with painted exterior
Temperature Range	-20 to 50 °C (-4 to 122 °F)
Size (H x W x L)	10.7 x 12.2 x 12.7 cm (4.2 x 4.8 x 5.0 in.)
Weight	3.3 kg (7.3 lb)

*Dead Time Correction, available on some instruments