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Radiation Protection Dosimetry Advance Access originally published online on August 21, 2008
Radiation Protection Dosimetry 2008 131(4):444-448; doi:10.1093/rpd/ncn211
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© The Author 2008. Published by Oxford University Press. All rights reserved. For Permissions, please email: journals.permissions@oxfordjournals.org

A method for the determination of thoron and thoron progeny concentration at workplaces and thoron concentration in calibration chambers

R. Falk*,{dagger}, G. Åkerblom{dagger} and Leif Nyblom

Swedish Radiation Protection Authority (SSI), SE-171 16 Stockholm, Sweden

* Corresponding author: r.a.falk{at}bredband.net

{dagger} Former employer of SSI, now retired

Received April 1, 2008, amended July 13, 2008, accepted July 21, 2008

A new method to determine the air concentration of 220Rn, commonly referred to as thoron, has been developed. The method is insensitive to the presence of any concentration of 222Rn. Air turbulence, humidity and temperature do not influence the measurement. This method was primarily developed for field measurement of 220Rn and 212Pb concentrations at workplaces in underground environments with high (222Rn) concentration, but has the potential to be used for reference measurement of 220Rn concentration in a calibration facility. The sampling and measurement devices are traceable to international standards. The proposed measuring technique has the potential to contribute to easy and accurate measurements of 220Rn. This paper describes the method and an example of its use in underground workplaces.


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