the concept of equivalent radon concentration for practical consideration of indoor exposure to thoron等效的概念为实际考虑室内氡浓度钍射气.pdfVIP

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the concept of equivalent radon concentration for practical consideration of indoor exposure to thoron等效的概念为实际考虑室内氡浓度钍射气.pdf

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the concept of equivalent radon concentration for practical consideration of indoor exposure to thoron等效的概念为实际考虑室内氡浓度钍射气

Int. J. Environ. Res. Public Health 2012, 9, 286-293; doi:10.3390/ijerph9010286 OPEN ACCESS International Journal of Environmental Research and Public Health ISSN 1660-4601 /journal/ijerph Article The Concept of Equivalent Radon Concentration for Practical Consideration of Indoor Exposure to Thoron Jing Chen * and Deborah Moir Radiation Protection Bureau, Health Canada, 2720 Riverside Drive, Ottawa K1A 0K9, Canada; E-Mail: deborah.moir@hc-sc.gc.ca * Author to whom correspondence should be addressed; E-Mail: jing.chen @hc-sc.gc.ca; Tel.: +1-613-941-5191; Fax: +1-613-960-5604. Received: 14 December 2011; in revised form: 6 January 2012 / Accepted: 16 January 2012 / Published: 18 January 2012 Abstract: To consider the total exposure to indoor radon and thoron, a concept of equivalent radon concentration for thoron is introduced, defined as the radon concentration that delivers the same annual effective dose as that resulting from the thoron concentration. The total indoor exposure to radon and thoron is then the sum of the radon concentration and the equivalent radon concentration for thoron. The total exposure should be compared to the radon guideline value, and if it exceeds the guideline value, appropriate remedial action is required. With this concept, a separate guideline for indoor thoron exposure is not