Manufacturer: Ludlum
Part Number: 47-1532
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The Model 44-2 sodium iodide (NaI) gamma scintillator is primarily used for detecting low levels of gamma radiation in the range of 60 keV–1.25 MeV. It consists of a 2.54 x 2.54 cm (1 x 1 in.) (Dia. X thickness) NaI crystal coupled to a photomultiplier tube and is housed in a 0.157 cm (0.062 in.) thick aluminum housing. The front entrance window has a total thickness of 2.3 cm (0.90 in.) of aluminum. The detector is energy dependent, over-responding by a factor of 10 or greater in the 100keV range and under-responding by a factor of 0.5 above 1 MeV when normalized to 137Cs.
The Model 44-2 will operate with any Ludlum instruments or equivalent instruments that provide 500–1200 volts. The recommended instrument input sensitivity is approximately 10 mV or higher.
Indicated Use
- Low-level, wide-energy
Suggested Instruments
- General purpose survey meters, ratemeters, and scalers
Detector Type
- Scintillator, 2.5 x 2.5 cm (1 x 1 in.) (Dia x L) thick NaI
Sensitivity
- Typically 175 cpm/μR/hr (137Cs gamma)
Background
- 1900 cpm
Efficiency
- 125I-7.0%
Recommended Energy Range
- 50 KeV–1.5 MeV
Energy Response
- Energy dependent, see graph below
Photomultiplier Tube
- 2.86 cm (1.125 in.) diameter
Operating Voltage
- 500–1200 volts
Connector
- Series "C"
Temperature Range
- -15 to 50 ° C (5 to 122 ° F), may be certified for -40 to 65 ° C (-40 to 150 ° F)
Size
- 5.1 x 18.5 cm (2 x 7.3 in.) (Dia x L)
Weight
- 0.5 kg (1 lb)
- Background radiation monitoring
- Low-level radiation detection
- Spectrum analysis, when used in conjunction with a single or multi-channel analyzer