Estimation of the indoor external γ-dose rate from decorative stones
10.3760/cma.j.issn.0254-5098.2014.05.016
- VernacularTitle:装饰装修用石材所致室内γ外照射剂量率的估算方法研究
- Author:
Qiang WANG
;
Weihai ZHUO
;
Yan KONG
;
Chao ZHAO
;
Dunhuang FAN
- Publication Type:Journal Article
- Keywords:
Building material;
Monte Carlo;
Dose rate;
External exposure
- From:
Chinese Journal of Radiological Medicine and Protection
2014;34(5):376-380
- CountryChina
- Language:Chinese
-
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.
