Ludlum Model 43-68
Alpha Beta Gas Proportional Detector
Part Number 47-2005

INDICATED USE: Alpha beta survey
RECOMMENDED COUNTING GAS: P-10 (10% methane, 90% argon)
GAS RECHARGE: Will operate on static charge for at least 15 hours with 39" cable; 5 hours in alpha/beta mode
WINDOW: 0.8 mg/cm2 aluminized mylar (other thicknesses available)
EFFICIENCY (4pi): 20%-239Pu; 15%-14C; 30%-99Tc; 30%-90Sr/90Y less than 1% - gamma
Simultaneous Alpha/Beta Counting: 17.5%-239Pu; 20%-99Tc; 20%90Sr/90Y
BACKGROUND: Alpha - Less than 7 cpm (when operating at Alpha only plateau region)
Beta-Gamma - Typically 350 cpm (10 mR/hr field)
SUGGESTED INSTRUMENTS: Models 12, 16, 18, 2000, 2200, 2221, 2224-1, 2241-2, 2350-1, 2360
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
WINDOW AREA: 126 cm2 active, 100 cm2 open
SIZE: 3.9" H x 4.6" W x 7.8" L (10 x 11.7 x 19.8 cm)
WEIGHT: 2 lb (0.9 kg)

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