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Energy Compensated GM Probe
Home / Fluke Biomedical

Energy Compensated GM Probe

The Model 90-12 is a rugged, lightweight, energy compensated, general-purpose Geiger-Mueller (GM) tube based hand held probe, with beta shields.

Categories: Fluke Biomedical, Raysafe

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  • Description
  • Features
  • Specifications

The Model 90-12 is a rugged, lightweight, energy compensated, general-purpose Geiger-Mueller (GM) tube based hand held probe, with beta shields. This probe is designed to fulfill a variety of radiation measurement needs. The adjustable beta shield is a 360º shield with a linear movement to permit is crimination between penetrating and non-penetrating radiation. The two windows expose an angle of 180º total in the most sensitive area of the GM tube. With the shield open, the probes measure beta, x-rays, and gamma rays. With the beta shield closed, the probes measure penetrating x-rays and gamma rays. A coiled coaxial cable connects these probes to a wide variety of Fluke Biomedical survey meters.

The energy compensation feature permits accurate exposure rate measurements from low to high energies, at rates less than 1 R/hr.

Features


Key Features

The Model 90-12 Energy Compensated GM probe when married with the Model 190 Count Rate Survey Meter is ideal for applications where discrimination of beta and gamma/x-rays is useful information. Typical applications for this probe include Nuclear Medicine laboratories and environmental surveys.

  • Energy compensated GM probe provides flat energy response for reduced GM tube over-response at low energy dose rates
  • Beta shield discriminates between beta rays and gamma/x-ray radiation
  • 360º beta shield
  • 2 beta windows expose 180º for optimum sweet spot
  • Rugged ABS plastic housing
  • Exposure rates up to 200 mR/hr

Specifications

Product Specifications
Radiation detected:
 Beta above 200 keV, Gamma above 12 keV
Operating voltage:
 900 V
Plateau length:
 100 V (min)
Plateau slope:
 0.1%/V (max)
Temperature range:
 40° to + 167°F (- 40° to + 75°C)
Relative humidity:
 0 to 95%, noncondensing
Wall thickness:
 30 mg/cm2 (tube)
Wall material:
 Stainless steel
Maximum background:
 15 CPM
Nominal sensitivity:
 720 CPM/mR/hr*
Maximum exposure rate:
 1 R/hr
Housing material:
 ABS plastic
Beta shield density:
 1890 mg/cm2
Beta window density:
 30 mg/cm2
Dimensions :
 1.38 in Ø x 6.7 in (l) (3.5 x 17 cm)
Weight:
 0.58 lb (0.26 kg)
*Calibrated to 137Cs.
 

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