The Model 44-21 is a dual crystal scintillation detector utilizing a thin plastic scintillator and 1" X 1mm NaI(Tl) crystal for beta and gamma measurements.


INDICATED USE: Beta, low energy gamma detection
SCINTILLATOR: 1" (2.5 cm) diameter X 1 mm thick NaI(Tl) crystal coupled to a 1" (2.5 cm) diameter X 0.01" (0.03 cm) thick plastic scintillator
WINDOW: 1.2 mg/cmē aluminized mylar
WINDOW AREA: Active and Open - 5.1 cmē
EFFICIENCY(4pi geometry): Typically 19% - I-125; 5%-C-14; 28%-P-32
SENSITIVITY: Typically 40 cpm/microR/hr (Cs-137 gamma )
ENERGY RESPONSE: Energy dependent
COMPATIBLE INSTRUMENTS: General purpose survey meters, ratemeters, and scalers
TUBE: 1.5:(3.8cm) diameter magnetically shielded photomultiplier
OPERATING VOLTAGE: Typically 500 - 1200 volts
CONNECTOR: Series "C" (others available )
CONSTRUCTION: Aluminum housing with beige polyurethane enamel paint
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: 2" (5.1 cm) diameter X 7.3" (18.5 cm)L
WEIGHT: 2 lb (0.9kg)


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