Ludlum 43-20 Gas Proportional Detector

The Model 43-20 is very similar to the Model 43-68 which replaced it. You get these at a slight discount. A large area gas proportional detector for use in simultaneous alpha/beta surveys as well as alpha or beta survey

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INDICATED USE: Alpha-beta survey
RECOMMENDED COUNTING GAS: P-10 (10% methane, 90% argon)
GAS RECHARGE: Will operate on a static charge for over 15 hours with a 39" cable
WINDOW: Typically 0.8 mg/cm² aluminized mylar (other thicknesses available)
WINDOW AREA:
Active - 181 cm²
Open - 143 cm²
EFFICIENCY (4pi geometry): Typically 20% - Pu-239; 30% - Tc-99; 15% - C-14; less than 1% - gamma
BACKGROUND:
Alpha - Less than 5 cpm (when operating on the alpha only plateau region)
Beta - Typically 400 cpm or less (10 micriR/hr field)
COMPATIBLE INSTRUMENTS: Model 12, 16, 18, 2000, 2200, 2221, 2224, 2225, 2241, 2350-1
OPERATING VOLTAGE:
Alpha - Typically 1000 - 1500 volts
Beta-gamma - Typically 1600 - 1800 volts
COUNTER THRESHOLD SETTING: Typically 2 - 5 mV
GAS CONNECTORS: Double end quick disconnect
CONNECTOR: Series "C" (others available)
CONSTRUCTION: Anodized aluminum housing
TEMPERATURE RANGE: -4° F(-20° C) to 122° F(50° C)
May be certified for operation from -40° F(-40° C) to 150° F(65° C)
SIZE: 3"(7.6cm)H X 5"(12.7cm)W X 8"(20.3cm)L
WEIGHT: 2 lbs (0.9kg)X