Ionization chamber for monitoring radioactive gas

Radiant energy – Geological testing or irradiation

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Details

250255, 2503361, G01T 102

Patent

active

048535362

ABSTRACT:
A small enclosed chamber with an electrostatically charged electret attached to the inner chamber wall. A filtered hole in the chamber permits radon or other radioactive gas to enter by diffusion. Positive or negative ions (depending on the polarity of the electret charge) formed in the chamber air by the decay of the radioactive gas move to and collect on the electret surface by virtue of its electrostatic attraction to ions of opposite polarity. These ions accumulate and cause a measurable reduction in the surface voltage of the electret which reduction is proportional to the time integrated concentration of the radioactive gas in the chamber. The electret surface voltage of the reduction value is used to calculate the average concentration of the radioactive gas during the exposure period. The electret thickness and chamber volume can both be increased to increase the sensitivity of the invention to radioactive gases such as radon, tritium or carbon-14 dioxide or such other radioactive gases.

REFERENCES:
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patent: 4064436 (1977-12-01), Ward, III
patent: 4338523 (1982-07-01), Alter
patent: 4385236 (1983-05-01), Hassib et al.
patent: 4401891 (1983-08-01), Lewiner et al.
patent: 4451736 (1984-05-01), Cameron
patent: 4518860 (1985-05-01), Alter et al.
Gupta et al, "Electret Personnel Dosemeter", Radiation Protection Dosimetry, 11 (2), pp. 107-112, 1985.
Kotrappa et al, "Measurement of Potential Alpha Energy Concentration of Radon and Thoron Daughters using an Electret Dosemeter", Radiation Protection Dosimetry, 5 (1), 1983, pp. 49-56.
Kotrappa et al, "An Electret Passive Environmental .sup.222 Rn Monitor Based on Ionization Measurement", Health Physics, 54 (1), Jan. 1988, pp. 47.56.

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