Alpha Detector - Model 43-40-3
CE Seal
Specifications

INDICATED USE: alpha survey
WORKING ENVIRONMENT: splashproof shields and desiccant-vented chamber for outdoor use
SUGGESTED INSTRUMENTS: Models 12, 16, 18, 2000, 2200, 2221, 2241, 2350-1
DETECTOR TYPE: air proportional
WINDOW: 0.4 mg/cm² aluminized mylar
WINDOW AREA: 320 cm² (49.6 in²) active; 253 cm² (39.2 in²) open
EFFICIENCY (4π): 10% for 239Pu
BACKGROUND: 3 cpm or less
OPERATING VOLTAGE: altitude sensitive
sea level - 2050 volts
610 m (2000 ft) - 2000 volts
1524 m (5000 ft) - 1925 volts
2134 m (7000 ft) - 1875 volts
COUNTER THRESHOLD SETTING: typically -2 mV
CONSTRUCTION: anodized aluminum body with aluminum screen (65% open)
CONNECTOR: series "C" (others available)
TEMPERATURE RANGE: