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Radiation Protection Dosimetry Advance Access originally published online on January 29, 2008
Radiation Protection Dosimetry 2008 130(2):253-256; doi:10.1093/rpd/ncm503
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© The Author 2008. Published by Oxford University Press. All rights reserved. For Permissions, please email: journals.permissions@oxfordjournals.org

Preliminary results of simultaneous radon and thoron tests in Ottawa

Jing Chen1,*, Shinji Tokonami2, Atsuyuki Sorimachi2, Hiroyuki Takahashi2 and Renato Falcomer1

1 Radiation Protection Bureau, Health Canada, 775 Brookfield Road, Ottawa, Canada K1A 1C1
2 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 September 24, 2007, amended December 13, 2007, accepted December 26, 2007

Ottawa is the capital city of Canada. In the previous cross Canada radon survey, Ottawa was not included. There is great interest to know radon level as well as thoron concentration in Ottawa homes. Therefore, radon/thoron discrimination detectors developed at the National Institute of Radiological Sciences in Japan were deployed in 93 houses for a period of 3 months. As expected, thoron is present in Ottawa homes. Radon concentrations ranged from 8 to 1525 Bq m–3 while thoron concentrations varied from 5 to 924 Bq m–3. The arithmetic mean of radon and thoron concentrations were found to be 110 ± 168 and 56 ± 123 Bq m–3, respectively.


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