Radiant energy – Invisible radiant energy responsive electric signalling
Patent
1989-05-25
1991-01-29
Hannaher, Constantine
Radiant energy
Invisible radiant energy responsive electric signalling
250253, 250376, G01T 114
Patent
active
049888765
ABSTRACT:
A system for measuring the cumulative amount of radiation received by a person includes a radiation monitoring electret. This electret is supported on a first conductive plate and preferably is positioned within a protective cavity such that it is not discharged by non-radiation sources. Measurement of the charge decrease on the electret over time is achieved by a null method. In particular, a second plate in the monitoring device located over the electret, or the electret itself, is vibrated and an A.C. amplitude modulation detector produces an output signal created by the alternating electric field due to the vibration. A D.C. voltage of opposite charge is then applied to the first conducting plate on which the electret is supported. This field is increased until it cancels the A.C. field above the electret. When this null occurs, the applied D.C. voltage is equal to the charge on the electret. Using this null technique the electret charge can be accurately measured without contacting the electret.
REFERENCES:
patent: 4227086 (1980-10-01), Dreyfus et al.
patent: 4355235 (1982-10-01), Lewiner et al.
patent: 4451736 (1984-05-01), Cameron
P. Kotrappa, J. C. Dempsey, J. R. Hickey and L. R. Stieff, "An Electret Passive Environmental .sup.222 Rn Monitor Based on Ionization Measurement," Health Physics, vol. 54, No. 1 (Jan. 1988), pp. 47-56; .COPYRGT.1988, Health Physics Society.
G. Pretzsch, B. Dorschel and A. Leuschner, "Investigation of Teflon Electret Detectors for Gamma Dosimetry," Radiation Protection Dosimetry, vol. 4, No. 2, (1983), pp. 79-84.
M. Ikeya and T. Miki, "Electret Dosimeter Utilizing Gas Multiplication," Health Physics, vol. 39, No. 11 (Nov. 1980), pp. 797-799.
H. Bauser and W. Ronge, "The Electret Ionization Chamber: A Dosimeter for Long-Term Personnel Monitoring," Health Physics, vol. 34, No. 1 (Jan. 1978), pp. 97-102.
Hannaher Constantine
Radon Testing Corporation of America
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