44-2 Probe (Gamma)

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

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