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Geiger Mueller Probe
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Geiger Mueller Probe

The Geiger-Mueller (GM) detectors fulfill a wide variety of radiation measurement needs. Probes are available for detection of alpha, beta, and gamma radiation. Some probes are provided with a 360° shield to permit discrimination between penetrating and non-penetrating radiation.

Categories: Fluke Biomedical, Raysafe

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  • Description
  • Features
  • Specifications

The Geiger-Mueller (GM) detectors fulfill a wide variety of radiation measurement needs. Probes are available for detection of alpha, beta, and gamma radiation. Some probes are provided with a 360° shield to permit discrimination between penetrating and non-penetrating radiation.

Reliability and ruggedness are built into the GM detectors, with uniformity of construction and field-proven design to assure dependable performance with all the GM survey instruments. Standard MHV type connectors readily allow interchange of all detector probes. The GM counters are fastened to the Model 190 Count Rate and Survey Meter by a Velcro® strap. The life expectancy of the counters ranges from 108 total counts to unlimited life depending on the type of quench gas utilized.

The scintillation detectors are carefully selected and optically coupled to photomultiplier tubes. The photomultipliers are magnetically shielded with mu-metal and specially shock mounted to provide trouble-free performance. The entire detector, crystal and photomultiplier, are secured in sturdy, cylindrical, aluminum housing. Where appropriate, a thin window has been utilized to provide alpha or low energy gamma response.

Key Features:

The GM probes provide a qualitative assessment for radiation detection. The following probe selection guide lists various probes and suggested applications. Applications include nuclear medicine counter top surveys, leakage detection from diagnostic x-ray and linear accelerators, geological surveys, scrap metal yards and unknown wells.

The scintillation detectors provide a quantitative assessment for radiation detection in counts/minutes. Applications outlined in this guide include nuclear medicine labs, HAZMAT spills, radiation safety office surveys, industrial hygiene, industrial x-ray manufacturing, and geological surveys.

GM probes for qualitative radiation detection
Scintillation probes for quantitative radiation assessment
All probes are direct read when married with Models 190 and 290 meters
Rugged and reliable designs
Scintillators are test selected and optically coupled to PMT
GM probes re available in pancake style, energy compensated and with beta discrimination

Features


Key Features

The GM probes provide a qualitative assessment for radiation detection. The following probe selection guide lists various probes and suggested applications. Applications include nuclear medicine counter top surveys, leakage detection from diagnostic x-ray and linear accelerators, geological surveys, scrap metal yards and unknown wells.

The scintillation detectors provide a quantitative assessment for radiation detection in counts/minutes. Applications outlined in this guide include nuclear medicine labs, HAZMAT spills, radiation safety office surveys, industrial hygiene, industrial x-ray manufacturing, and geological surveys.

  • GM probes for qualitative radiation detection
  • Scintillation probes for quantitative radiation assessment
  • All probes are direct read when married with Models 190 and 290 meters
  • Rugged and reliable designs
  • Scintillators are test selected and optically coupled to PMT
  • GM probes re available in pancake style, energy compensated and with beta discrimination

Specifications

Product Specifications
Type:
Beta, gamma, and x-ray with sliding 360° metal shield for beta discrimination
Radiation detected
Gamma above 12 keV and beta above 200 keV
Applications:
Beta, gamma probe is more sensitive than 491-40 or 493-50, but has max. rate of 100 mR/hr
Typical background (shielded):
20 CPM
Maximum exposure rate:
100 mR/h (1 mSv/hr)
Nominal sensitivity to 1 mR/hr of 60Co:
2200 CPM
Replacement GM tube part number:
35-150
Wall material:
Stainless steel
Wall thickness:
30 to 40 mg/cm2
Active length:
2.25 in (57.2 mm)
Quenching gas:
Neon & halogen
Diameter of probe:
1.1875 in (30 mm)
Length of probe:
5.375 in (136 mm)
Cable length:
48 in(122 cm)
Weight:
Approx. 1.0 lb (0.45 kg)
Operating voltage:
900 V
Humidity range:
0 to 95%
Operating temperature range:
– 65° to + 185°F (- 56° to + 85°C)
Pressure range:
To 15 psig

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