Model 44-142 Beta Scintillator

Model 44-142 beta scintillation probe by Ludlum

The Model 44-142 is a beta scintillator. With an active area of 100 cm2, this detector is ideal for surveys for beta contamination.

Indicated Use Beta survey
Detector Type 0.25 mm (0.01 in.) thick plastic scintillator
Window 1.2 mg/cm2 metalized polyester
Window Area Active: 100 cm2 (15.5 in2)
Open: 88 cm2 (13.6 in2)
Protective Screen 0.76 mm (0.031 in.) thick stainless steel, 6.5 mm (0.26 in.) square openings, 88% open
Outer Dimensions (L x W): 168 x 92 mm (6.6 x 3.6 in.)
Efficiency (4π)
99Tc: 20%
90Sr/90Y: 30%
14C: 4%
Typical Background (10 µR/hr field) 300 cpm or less
Detector Uniformity 10% or less from average reading
Gamma Sensitivity approx. 20 cpm per µR/hr (137Cs)
Dead Time typically 5 µs or less
Photomultiplier Tube 29 mm (1.125 in.) diameter; magnetically shielded
Operating Voltage typically 500 to 1200 V (1500 V max.)
Temperature Range -20 to 50 °C (-4 to 122 °F)
Environmental Rating IP rating of 63
Connector Series "C" (others available)
Construction Aluminum with beige powder coating
Size (H x W x L) 6.4 x 9.5 x 31.1 cm (2.5 x 3.8 x 12.3 in)
Weight 0.5 kg (1 lb)