Wide range radioactive gas concentration detector

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

G - Physics

01

T

358/21

G01T 1/185 (2006.01) G01T 7/02 (2006.01) H01J 47/02 (2006.01)

Patent

CA 1185018

ABSTRACT OF THE DISCLOSURE 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 migra- tion 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 con- tamination 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 mini- mize contamination effects.

414718

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