Radon progeny monitor

Details Radon progeny monitor Radon progeny monitor

2007-12-25

2007-12-25

Porta, David (Department: 2884)

Radiant energy

Geological testing or irradiation

With sampling

C250SDIG001

Reexamination Certificate

active

10919526

ABSTRACT:
A new type of radon progeny monitor called an electret radon progeny integrating sampling unit (E-RPISU) using an electret ion chamber to measure radon progeny concentration. A conventional 1 LPM particulate air sampling system is used to collect the radon progeny on a roughly 3.5 cm2filter that is mounted on a side of an electret ion chamber such that the collected progeny are exposed to the inside of the chamber. Alpha radiation emitted by the progeny collected on the filter ionizes the air in the approximately 220 ml chamber. Ions of opposite polarity collect on the surface of the electret of suitable thickness and reduce its surface voltage. A specially built surface voltmeter is used to measure the electret voltage before and after sampling. The electret voltage drop that occurs during the sampling period is proportional to the time integrated progeny concentration. A similar unit with a screen in the place of filter is used to measure unattached progeny concentration. Another similar unit without filter is used to provide background response to compute net progeny concentration and also to compute radon concentration.

REFERENCES:
patent: 4385236 (1983-05-01), Hassib et al.
patent: 4518860 (1985-05-01), Alter et al.
patent: 4800272 (1989-01-01), Harley et al.
patent: 4847503 (1989-07-01), Tetley et al.
patent: 4853536 (1989-08-01), Dempsey et al.
patent: 4861985 (1989-08-01), Pai
patent: 4920263 (1990-04-01), Fimian et al.
patent: 4926053 (1990-05-01), Dempsey et al.
patent: 4963730 (1990-10-01), Tetley et al.
patent: 4975575 (1990-12-01), Perlman
patent: 4992658 (1991-02-01), Ramsey, Jr. et al.
patent: 5008540 (1991-04-01), Dempsey
patent: 5026986 (1991-06-01), Hurst
patent: 5026989 (1991-06-01), Merkel
patent: 5055674 (1991-10-01), Kotrappa
patent: 5068538 (1991-11-01), Harley
patent: 5128540 (1992-07-01), Stieff
patent: 5134297 (1992-07-01), Harley et al.
patent: 5204528 (1993-04-01), Hurst et al.
patent: 5225673 (1993-07-01), Pressianov et al.
patent: 5319208 (1994-06-01), Diamondis
patent: 6018985 (2000-02-01), Lane-Smith
patent: 6228400 (2001-05-01), Lee et al.
patent: 6288400 (2001-09-01), Negro
patent: 2002/0014596 (2002-02-01), Harley et al.
Voltmeter, The Columbia Encyclopedia 2006, Columbia University Press, 6th Edition.
Evans, Robley D.;Engineers' Guide to the Elementary Behavior of Radon Daughters; Health Physics, vol. 17; Pergamon Press; 1969; pp. 229-252.
Kotrappa et al.;A Practical E-PERM(Electret Passive Environmental Radon Monitor); Health Physics, vol. 58, No. 4; Pergamon Press; Apr. 1990; pp. 461-467.
Kotrappa et al.;Measurement of Potential Alpha Energy Concentration of Radon and Thoron Daughters Using an Electret Dosemeter; Radiation Protection Dosimetry, vol., No. 1; Nuclear Technology Publishing; 1983; pp. 49-56.
Kotrappa et al.;An Electret Passive Environmental222RN Monitor Based on Ionization Measurement; Health Physics, vol. 54, No. 1: Health Physics Society, Jan. 1988; pp. 47-56.
Kotrappa et al.;An E-RPISU(Electret Radon Progeny Integrating Sampling Unit)A New Instrument for Measurement of Radon Progeny Concentration in Air; Proceedings of the 1990 International Symposium on Radon and Radon Reduction Technology, vol. 58, No. 4; Apr. 1990; pp. 461-467.

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