Preliminary assessment of thoron exposure in Canada

被引：9

作者：

Chen, J. ^{[1
]}

Dessau, J. C. ^{[2
]}

Frenette, E. ^{[3
]}

Moir, D. ^{[1
]}

Cornett, R. J. ^{[1
]}

机构：

[1] Hlth Canada, Radiat Protect Bur, Ottawa, ON K1A 0L2, Canada

[2] Environm Hlth, Laurentian Reg Publ Hlth Dept, St Jerome, PQ, Canada

[3] Hlth Canada, Quebec Reg Off, Longueuil, PQ, Canada

来源：

RADIATION PROTECTION DOSIMETRY | 2010年 / 141卷 / 04期

关键词：

D O I：

10.1093/rpd/ncq226

中图分类号：

X [环境科学、安全科学];

学科分类号：

08 ; 0830 ;

摘要：

Radon has been identified as the second leading cause of lung cancer after tobacco smoking. Rn-222 (radon gas) and Rn-220 (thoron gas) are the most common isotopes of radon. In this study, thoron exposure in Canada was assessed based on three community radon/thoron surveys conducted recently. It was confirmed that thoron was detectable in most homes and thoron progeny were present in every home surveyed. Results demonstrated that thoron concentrations varied more widely than radon. No clear correlation between Rn-222 and Rn-220 concentrations was observed in simultaneous measurements. It is estimated that thoron contributes to about 7 % of the radiation dose due to indoor radon exposure based on measurements in about 260 individual homes. Because indoor measurements and geological gamma-ray surveys did not support a reasonable association between Rn-222 and Rn-220, thoron concentrations could not be predicted from widely available indoor radon information. In order to better assess thoron exposure in Canada and thoron risk to the Canadian population in various geographic locations, more thoron progeny measurements are required.

引用

页码：322 / 327

页数：6

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