Dose estimation and radon action level problems due to nanosize radon progeny aerosols in underground manganese ore mine |
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Authors: | Kávási Norbert Vigh Tamás Kovács Tibor Vaupoti? Janja Jobbágy Viktor Ishikawa Tetsuo Yonehara Hidenori |
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Institution: | a Research Center for Radiation Protection, National Institute of Radiological Sciences, Environmental Radiation Effects Research Group, Anagawa 4-9-1, Inage-ku, Chiba 263 8555, Japan b Mangán Mining and Processing Ltd., Külterület 1, 8409 Úrkút, Hungary c Institute of Radiochemistry and Radioecology, University of Pannonia, Egyetem 10, 8200 Veszprém, Hungary d Department of Environmental Sciences, Radon Center, Jo?ef Stefan Institute, Jamova 39, 1000 Ljubljana, Slovenia e Social Organization for Radio Ecological Cleanliness, Egyetem 10, 8200 Veszprém, Hungary |
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Abstract: | One of the essential parameters influencing of the dose conversion factor is the ratio of unattached short-lived radon progeny. This may differ from the value identified for indoor conditions when considering special workplaces such as mines. Inevitably, application of the dose conversion factors used in surface workplaces considerably reduces the reliability of dose estimation in the case of mines.This paper surveyed the concentration of radon and its short-lived radon progeny and identified the unattached fraction of short-lived radon progeny. As well equilibrium factor during the month of August was calculated simultaneously at two extraction faces in a manganese ore mine.During working hours the average radon concentrations were 220 Bq m−3 and 530 Bq m−3 at Faces 1 and 2; the average short-lived progeny concentration was 90 Bq m−3 and 190 Bq m−3, the average equilibrium factors were 0.46 and 0.36, and the average unattached fractions were 0.21 and 0.17, respectively. The calculated dose conversion factor was between 9 and 27 mSv WLM−1, but higher values could also be possible. |
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Keywords: | Radon Radon progeny Unattached fraction Dose conversion factor Dose estimation Manganese ore mine |
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