Wide range radioactive gas concentration detector

Details Wide range radioactive gas concentration detector Wide range radioactive gas concentration detector

1981-11-16

1984-04-03

Howell, Janice A.

Radiant energy

Invisible radiant energy responsive electric signalling

Including a radiant energy responsive gas discharge device

G01T 118

Patent

active

044410247

ABSTRACT:
A wide range radioactive gas concentration detector and monitor which is capable of measuring radioactive gas concentrations over a range of eight orders of magnitude. The device of the present invention is designed to have an ionization chamber which is sufficiently small to give a fast response time for measuring radioactive gases but sufficiently large to provide accurate readings at low concentration levels. Closely spaced parallel plate grids provide a uniform electric field in the active region to improve the accuracy of measurements and reduce ion migration time so as to virtually eliminate errors due to ion recombination. The parallel plate grids are fabricated with a minimal surface area to reduce the effects of contamination resulting from absorption of contaminating materials on the surface of the grids. Additionally, the ionization chamber wall is spaced a sufficient distance from the active region of the ionization chamber to minimize contamination effects.

REFERENCES:
patent: 3621238 (1971-11-01), Jalbert et al.
patent: 3746861 (1973-07-01), Gant et al.
Belovodskii et al., "Ionization Chamber for Measurement of High Tritium Concentrations," translated from Pribory i Teknika Eksperimenta, No. 4, pp. 88-90, Jul.-Aug. 1971.
Anderson et al., "Management of Gaseous Wastes from Nuclear Facilities," International Atomic Energy Agency, Vienna, 1980.

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