Alpha Detector - Model 43-65
CE Seal
Specifications

INDICATED USE: alpha survey
SCINTILLATOR: ZnS(Ag)
WINDOW: typically 0.8 mg/cm² metalized polyester (1.2 mg/cm² recommended for outdoor use)
BACKGROUND: 3 cpm or less
NON-UNIFORMITY: less than 10%
SUGGESTED INSTRUMENTS: general purpose survey meters, ratemeters, and scalers
OPERATING VOLTAGE: typically 500 to 1200 volts
WINDOW AREA: 63 cm² active; 50 cm² open
PHOTOMULTIPLIER TUBE: 3.8 cm (1.5 in.) diameter
CONNECTOR:  series "C" (others available)
EFFICIENCY (4π): 17% for 239Pu; 17% for 230Th
SIZE: 10.2 x 10.2 x 24.8 cm (4 x 4 x 9.8 in.) (H x W x L)
WEIGHT: 0.6 kg (1.2 lb)