Ludlum Model 44-3 Low Energy Gamma Scintillator

The Model 44-3 is a 1" X 1mm NaI(Tl) Gamma Scintillator for low energy gamma that can be used with several different instruments including survey meters, scalers, ratemeters, and alarm ratemeters.

Indicated Use: I-125 and x-ray survey
Scintillator: 1" (2.5 cm) diameter X 1mm thick sodium iodide (NaI)Tl scintillator
Entry Window: 15 mg/cm²
Window Area: 5 cm² active and open
Recommended Energy Range: Approximately 10 - 60 keV
Background: Typically 40 cpm/microR/hr
Sensitivity: Typically 675 cpm/microR/hr (I-125)
Efficiency(4pi geometry): Typically 19% - I-125
Compatible Instruments: General purpose survey meters, ratemeters, and scalers
Tube: 1.5:(3.8cm) diameter magnetically shielded photomultiplier
Operating Voltage: Typically 500 - 1200 volts
Dynode String Resistance: 100 megohm
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 to operate from -40° F(-40° C) to 150° F(65° C)
Size: 2" (5.1 cm) diameter X 7" (17.8 cm)L
Weight: 1 lb (0.5kg)                                      

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Energy Response Characteristics