Alpha Detector - Model 43-90
CE Seal
Specifications

INDICATED USE: alpha survey
SUGGESTED INSTRUMENTS: general purpose survey meters, ratemeters, and scalers
SCINTILLATOR: ZnS(Ag)
EFFICIENCY (4π): 20%–239Pu
WINDOW: 0.8 mg/cm² aluminized Mylar
WINDOW AREA
: approximately 125 cm²(19.4 in²) active, 100 cm² (15.5 in²) open
UNIFORMITY:  ±10% from average reading
BACKGROUND: alpha 3 cpm or less
PHOTOMULTIPLIER TUBE: 3.8 cm (1.5 in.) diameter
OPERATING VOLTAGE: typically 500-1000 volts (1500 maximum)
CONSTRUCTION: aluminum with beige powder coating
TEMPERATURE RANGE: -20 to 50 °C (-4 to 122 °F)
CONNECTOR: series "C"
SIZE: 33 x 10 x 10 cm (12.25 x 4 x 4 in.) (H x W x L)
WEIGHT: 0.68 kg (1.5 lb)