Alpha/Beta Detector - Model 43-147
Specifications

INDICATED USE: alpha beta survey
SUGGESTED INSTRUMENTS: Ludlum Model 2224-1, Model 2360
DETECTOR TYPE: ZnS(Ag) adhered to 0.025 cm (0.010 in.) thick plastic scintillation material
EFFICIENCY (4π): 20% of 239Pu; 13% of 99Tc; 20% of 90Sr/90Y
WINDOW: 1.2 mg/cm² metalized polyester
PROTECTIVE SCREEN: removable, 0.79 mm (0.03 in.) thick, 6.5 mm (0.26 in.) square openings, 88% open
SCREEN OUTER DIMENSIONS: 225.4 x 113.7 mm (8.875 x 4.75 in.) (L x W)
WINDOW AREA:
     Open: 176 cm² (27.3 in²) open
     Active: 200 cm² (31.0 in²) active
NON-UNIFORMITY: less than 10%
BACKGROUND: alpha: 3 cpm or less; beta; 400 cpm or less
CROSS TALK:
     alpha to beta: < 10%
     beta to alpha: < 1%
PHOTOMULTIPLIER TUBE: 2.9 cm (1.12 in.) diameter
OPERATING VOLTAGE: typically 500–1200 volts
CONSTRUCTION: aluminum with beige powder coat
TEMPERATURE RANGE: -20 to 50 °C (-4 to 122 °F)
CONNECTOR: series “C”, unless specified otherwise
OVERALL SIZE: 10.7 x 12.1 x 35.6 cm (4.2 x 4.76 x 14 in.) (H x W x L)
WEIGHT: 0.7 kg (1.5 lb)