【摘要】 以新疆哈密、托里两地的大型石材企业为研究对象,初步调查了新疆石材资源花岗岩的天然放射性水平,包括矿坑、原料和产品、废品堆场的表面吸收剂量率、氡浓度以及固体样品及加工废水中的天然放射性核素浓度,监测了建材生产企业相关区域的γ辐射剂量率。结果表明,约有20%～25%的花岗岩样品超过国家环保部关于伴生矿的γ辐射剂量率认定值,其余基本上处于当地本底范围。更多还原

【Abstract】 This paper reports the measurement methods and results of natural radioactivity level in large-sized granite stone factories in Hami and Tuoli in Xinjiang Autonomous Region,such as mine pit,materials,finished productions and waste pile.Surface gamma exposure rate of materials and products,radon concentration,as well as specific activity of natural radionuclides in solid samples and process wastewater are detected,and for part of building materials,gamma radiation dose rate in buildings is also measured.It is concluded that the results of measurement fall in the range of the local background except for 20%-25% granite samples in excess of the level specified by National Environmental Protection Agency with respect to gamma radiation dose rate.更多还原