Alpha Beta Detector - Model 43-68
CE Seal
Specifications

INDICATED USE: alpha beta survey
SUGGESTED INSTRUMENTS: Models 12, 16, 18, 2000, 2200, 2221, 2224-1, 2241-2, 2350-1, 2360
DETECTOR TYPE: rechargeable gas proportional
RECOMMENDED COUNTING GAS: P-10 (10% methane, 90% argon)
GAS RECHARGE: will operate on static charge for at least 15 hours with 1 m (39 in.) cable; 5-hour static charge if connected to a simultaneous alpha/beta measuring instrument
WINDOW: 0.8 mg/cm² metalized polyester (other thicknesses available)
WINDOW AREA: 126 cm² (19.5 in²) active, 100 cm² (15.6 in²) open
EFFICIENCY (4π): 20% for 239Pu; 15% for 14C; 30% for 99Tc; 20% for 90Sr/90Y, less than 1% for gamma
SIMULTANEOUS ALPHA/BETA COUNTING: 17.5% for 239Pu; 20% for 99Tc; 20% for 90Sr/90Y
BACKGROUND:
alpha: < 3 cpm (when operating at alpha-only plateau region)
beta-gamma: typically 350 cpm (10 µR/hr field)
OPERATING VOLTAGE:
 alpha: typically 1100–1400 volts
beta-gamma: typically 1600–1800 volts
COUNTER THRESHOLD SETTING: typically 2–5 mV
GAS CONNECTORS: double-end quick disconnect
SIZE: 10 x 11.7 x 19.8 cm (3.9 x 4.6 x 7.8 in.) (H x W x L), with handle
WEIGHT: 0.9 kg (2 lb)