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Radiation Protection Dosimetry Advance Access published online on September 23, 2009
Radiation Protection Dosimetry, doi:10.1093/rpd/ncp177
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Published by Oxford University Press 2009. All rights reserved. For Permissions, please email: journals.permissions@oxfordjournals.org

AN INVESTIGATION ON RADON AND THORON RESPONSE OF ALPHA-TRACK DETECTORS USED IN THE WINNIPEG CASE–CONTROL STUDY

Jing Chen1,*, Bill Walker1, Atsuyuki Sorimachi2, Hiroyuki Takahashi2 and Shinji Tokonami2

1 Radiation Protection Bureau, Health Canada, 775 Brookfield Road, Ottawa, Canada K1A 1C1
2 Research Center for Radiation Protection, National Institute of Radiological Sciences, 4-9-1 Anagawa, Inage-ku, Chiba 263-8555, Japan

* Corresponding author: jing_chen{at}hc-sc.gc.ca

Received May 13, 2009, amended July 29, 2009, accepted August 25, 2009

The alpha-track detector was well designed for long-term radon measurements in the 1992 Winnipeg case–control study. However, its diffusion characteristic for thoron in comparison to radon was yet unknown. An investigation on radon and thoron response of these detectors was undertaken. The results showed that the relative sensitivity between thoron and radon is 2 %, i.e. the detector sensitivity to radon is about 50 times higher than the sensitivity to thoron. It can be concluded that there was no significant influence of thoron on the radon measurements with these detectors.


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