Radiant energy – Geological testing or irradiation
Patent
1987-03-04
1989-01-24
Howell, Janice A.
Radiant energy
Geological testing or irradiation
250255, 250337, G01T 111
Patent
active
048002720
ABSTRACT:
A passive device for measuring environmental radioactivity employs three radiation detectors enclosed in a small shielded housing. A first radiation detector generates a first signal responsive to an amount of radioactivity produced over a period of time by radioactive gas diffused in the volume of air inside the housing. The first radiation detector includes at least one thermoluminescence dosimeter mounted in close proximity to an electret. A second radiation detector generates a second signal responsive to an amount of environmental gamma radiation over the period of time, and also includes at least one thermoluminescence dosimeter. A third radiation detector generates a third signal indicative of an amount of fading of the second signal over the period of time, the third radiation detector also including at least one thermoluminescene dosimeter having an initially predetermined third signal.
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Maiello, et al., "EGARD: An Environmental Gamma-Ray and Radon 222 Detector", Health Physics vol. 53, No. 3, Sep. 1987, pp. 301-305.
Harley Naomi H.
Maiello Mark L.
Howell Janice A.
New York University
Rauchholz William F.
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