Radiant energy – Invisible radiant energy responsive electric signalling
Patent
1989-07-31
1991-04-16
Fields, Carolyn E.
Radiant energy
Invisible radiant energy responsive electric signalling
250374, G01T 114
Patent
active
050085409
ABSTRACT:
A small enclosed ion chamber with an electrostatically charged electret attached to the inner chamber wall. Positive or negative ions (depending on the polarity of the electret charge) formed in the chamber air by the passing of gamma radiation or X-rays move to and collect on the electret surface by virtue of its electrostatic attraction to ions of opposite polarity. These ions neutralize the ions of opposite polarity on the electret and cause a measurable reduction in its surface voltage which reduction is proportional to the dose of gamma and/or X-ray incidence on the chamber. The reduction of the electret surface voltage is used to calculate the dose of gamma or X-ray radiation incident upon the chamber during a known exposure period. In the preferred embodiment, filtered holes in the chamber permit radon to diffuse out of the ion chamber. A sealed outer container containing an absorbent such as activated charcoal surrounds the inner ion chamber to remove any radon captured within the container and to prevent any ambient radon from entering the ion chamber. Removal of this radon removes its undesirable contribution to the gamma/X-ray dose signal and thereby enhances the accuracy of the monitor.
REFERENCES:
patent: 2695363 (1954-11-01), Marvin
Fields Carolyn E.
Rad Elec Inc.
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