Features
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:
- 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
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*
*Calibrated to 137Cs.
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)
Product Number: 90-12
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