Model 44-21 Beta-Gamma Detector

The Model 44-21 is a dual crystal scintillation detector utilizing a thin plastic scintillator and 1" X 1mm NaI(Tl) crystal for beta and gamma measurements.

Indicated Use Beta; Low-energy gamma detection
Detector Type NaI(Tl) scintillator, 2.54 cm (1 in) dia. x 0.1 cm (0.04 in) thick, adhered to plastic scintillator, 0.03 cm (0.01 in) thick
Window 3.4 mg/cm²
Window Area Active: 5.1 cm² (0.8 in²)
Open: 5.1 cm² (0.8 in²)
Efficiency (4π)
¹⁴C: 4%
³²P: 28%
¹²⁵I: 38%
¹²⁹I: 19%
Typical Background (10 µR/hr field) 450 cpm
Non-Uniformity < 10%
Photomultiplier Tube 3.8 cm (1.5 in) diameter
Operating Voltage 500 to 1200 V (typical)
Connector Series "C" (others available)
Construction Aluminum housing with beige powder coat
Size (D x L) 5.1 x 18.5 cm (2 x 7.3 in) with connector cap
Weight 0.5 kg (1 lb)