宁夏主要煤田原煤、煤灰中放射性核素水平调查及煤炭燃烧对室内放射性环境的影响  

Investigation of radionuclide levels of raw coal and coal ash in main coalfields of Ningxia and effect of coal combustion on indoor radioactive environment

作　　者：杨秀龙 李佐有 席建建 叶敏生 窦志娟 刘士杰 YANG Xiulong;LI Zuoyou;XI Jianjian;YE Minsheng;DOU Zhijuan;LIU Shijie(Nuclear Geological Survey Institute of Ningxia Hui Autonomous Region,Yinchuan 750021,Ningxia,China)

机构地区：[1]宁夏回族自治区核地质调查院(宁夏回族自治区放射性地质研究所),宁夏银川750021

出　　处：《矿产与地质》2024年第3期563-566,608,共5页Mineral Resources and Geology

基　　金：宁夏回族自治区自然科学基金项目(编号:2021AAC03476)资助。

摘　　要：选取宁夏主要煤田煤炭为研究对象,开展煤炭室内燃烧实验,研究各煤田原煤、煤灰中放射性核素比活度、富集效果,评价煤炭燃烧对室内放射性环境的影响。结果表明:①宁夏主要煤田原煤中放射性核素水平:石嘴山煤田>宁南煤田>宁东煤田。煤灰中石嘴山煤田煤灰放射性核素整体含量高于宁东煤田及宁南煤田,宁南煤田放射性核素^(40)K比活度略低于宁东煤田外,^(238)U、^(232)Th、^(226)Ra比活度均高于宁东煤田。②通过对比各煤田煤灰中放射性核素富集因子,可以发现香山煤田煤灰中放射性核素富集水平最低,石嘴山煤田次之,富集效果最好的为宁东煤田。③与未开展煤炭燃烧实验相比,煤炭燃烧可以提高居住房间室内放射性水平。The coal of main coalfields in Ningxia is selected as the research object,and the indoor combustion experiment of coal is carried out to study the specific activity and enrichment effect of radionuclides in raw coal and coal ash of each coalfield,and to evaluate the influence of coal combustion on indoor radioactive environment.The study result shows that firstly,the level of radionuclides in raw coal of main coalfields in Ningxia is in the order of Shizuishan coalfield>Ningnan coalfield>Ningdong coalfield.The overall content of radionuclides in coal ash of Shizuishan coalfield is higher than that of Ningdong coalfield and Ningnan coalfield.The specific activity of radionuclide^(40)K in Ningnan coalfield is slightly lower than that of Ningdong coalfield,and the specific activity of 238 U,232 Th and 226 Ra is higher than that of Ningdong coalfield.Secondly,by comparing the enrichment factors of radionuclides in coal ash of each coalfield,it can be found that the enrichment level of radionuclides in coal ash of Xiangshan coalfield is the lowest,followed by Shizuishan coalfield,and the best enrichment effect is Ningdong coalfield.Thirdly,compared with no coal combustion experiment,coal combustion can increase the indoor radioactivity level of living room.

关 键 词：天然放射性核素 原煤 煤灰 比活度 富集因子 

分 类 号：X131.1[环境科学与工程—环境科学]