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Radiation Protection Dosimetry Advance Access originally published online on April 22, 2009
Radiation Protection Dosimetry 2009 134(2):75-78; doi:10.1093/rpd/ncp065
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Published by Oxford University Press 2009. All rights reserved. For Permissions, please email: journals.permissions@oxfordjournals.org

Simultaneous 222Rn and 220Rn measurements in Winnipeg, Canada

Jing Chen1,*, Eveline Schroth2, Esther MacKinlay3, Ingvar Fife3, Atsuyuki Sorimachi4 and Shinji Tokonami4

1 Radiation Protection Bureau, Health Canada, 775 Brookfield Road, Ottawa, Canada
2 Manitoba Regional Office, Health Canada, 510 Lagimodiere Boulevard, Winnipeg, Canada
3 CancerCare Manitoba, 675 McDermot Avenue, Winnipeg, Canada
4 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 February 18, 2009, amended March 23, 2009, accepted March 26, 2009

Naturally occurring isotopes of radon in indoor air are identified as the second leading cause of lung cancer after tobacco smoking. Winnipeg had the highest radon (222Rn) concentration among 18 Canadian cities surveyed in the past. There is great interest to know the current radon as well as thoron (220Rn) concentrations in Winnipeg homes. Therefore, radon–thoron discrimination detectors were deployed in 117 houses for a period of 3 months. The results confirmed that thoron is present at detectable levels in about half of the Winnipeg homes and radon remains significantly higher than the national average. In this study, radon concentrations ranged from 20 to 483 Bq m–3 with a geometric mean of 112 Bq m–3 and a geometric standard deviation of 2.07. It is estimated that 20% of Winnipeg homes could have radon concentrations above the Canadian indoor radon guideline of 200 Bq m–3. This conclusion is similar to the previous estimation made 20 y ago. Thoron concentrations were below the detection limit in 60 homes. Among the homes with detectable thoron concentrations, the values varied from 5 to 297 Bq m–3, the geometric mean and standard deviation were 21 Bq m–3 and 2.53, respectively.


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 Radiat Prot DosimetryHome page
J. Chen, B. Walker, A. Sorimachi, H. Takahashi, and S. Tokonami
AN INVESTIGATION ON RADON AND THORON RESPONSE OF ALPHA-TRACK DETECTORS USED IN THE WINNIPEG CASE-CONTROL STUDY
Radiat Prot Dosimetry, September 23, 2009; (2009) ncp177v1.
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