| Wang Qiang,Zhuo Weihai,Kong Yan,Zhao Chao,Fan Dunhuang.Estimation of the indoor external γ- dose rate from decorative stones[J].Chinese Journal of Radiological Medicine and Protection,2014,34(5):376-380 |
| Estimation of the indoor external γ- dose rate from decorative stones |
| Received:December 24, 2013 |
| DOI：10.3760/cma.j.issn.0254-5098.2014.05.016 |
| KeyWords:Building material Monte Carlo Dose rate External exposure |
| FundProject:上海市公共卫生优秀学科带头人培养计划（GWDTR201206） |
| Author Name | Affiliation | E-mail | | Wang Qiang | Institute of Radiation Medcine, Fudan University, Shanghai 200032, China | | | Zhuo Weihai | Institute of Radiation Medcine, Fudan University, Shanghai 200032, China | whzhuo@fudan.edu.cn | | Kong Yan | Institute of Radiation Medcine, Fudan University, Shanghai 200032, China | | | Zhao Chao | Institute of Radiation Medcine, Fudan University, Shanghai 200032, China | | | Fan Dunhuang | Institute of Radiation Medcine, Fudan University, Shanghai 200032, China | |
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| Abstract:: |
| Objective To establish an accurate method for estimating the indoor gamma dose rate from decorative stones.Methods Combining a room model with decorating conditions, the gamma dose rates and dose rate conversion factors (DCF) at 1 m above the floor in the room center were calculated with the Monte Carlo simulations, and the calculation results were verified through experiments.Based on the results, the limit of radionuclide contents in stone materials was further discussed.Results The DCF increases with the increase of area or thickness of decorative stones in the same room.The increase of DCF with the thickness of decorative stone is approximately linear.The DCF also increases with the area of decorative stones, but the increasing trend slows down.For the same decorative stones, the smaller the room, the larger the increase of gamma dose rate.Experimental results were consistent with the simulation results within ±20%.Conclusions The increase of indoor gamma dose rate depends not only on the radionuclide contents, but also on the area and thickness of the decorative stones as well as the room size.The method used in this study can be used to estimate, more accurately than ever, the additional external exposure to residents due to decorative stones, and it provides a theoretical basis for revising the limit standard on radionuclide contents in decorative materials. |
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