摘要
本研究采用实验室模拟的研究方法,对青岛城市规划区岩芯样品进行了^(222)Rn释放量测试,根据岩芯中^(222)Rn的深度分布特征,进一步测定了岩芯的^(226)Ra含量。结果表明岩芯中^(222)Rn活度范围为0.1~16.8 kBq·m^(-3),平均值为(1.9±2.6)kBq·m^(-3)(n=180),不同类型样品的^(222)Rn释放能力表现为闪长岩>粉质黏土>砂质泥岩>中粗砂>花岗岩。岩芯中^(226)Ra含量范围为6.0~44.0 Bq·kg^(-1),平均值为(12.1±11.3)Bq·kg^(-1)(n=40),其中^(226)Ra在砂质泥岩和中粗砂中含量最低,在闪长岩中含量最高。对于成岩样品,^(226)Ra含量和孔隙率可能是影响其^(222)Rn释放量及深度分布的重要因素。
The authors used the laboratory simulation experiment to detect radon concentrations in cores collected in Qingdao urban planning area.According to the spatial distribution characteristics of radon concentrations in vertical profiles,the ^(226)Ra concentrations of cores were further measured.The main results indicate that,radon concentrations ranged from 0.1 to 16.8 kBq·m^(-3),and the average concentration was(1.9±2.6)kBq·m^(-3)(n=300).According to different lithology of samples,radon concentrations released from cores were shown as diorite>silty clay>sandy mudstone>medium coarse sand>granite.The^(226)Ra concentrations ranged from 6.0 to 44.0 Bq·kg^(-1),the average concentration was(12.1±11.3)Bq·kg^(-1)(n=40).Among these samples,^(226)Ra concentrations were the lowest in sandy mudstone and medium coarse sand,while the highest concentration was in diorite.For diagenetic samples,the ^(226)Ra concentrations and rock porosity are important influence factors for radon release property and spatial distribution characteristics from cores.
作者
张晓洁
窦衍光
肖柳
赵世彬
张涵
所芳屹
Zhang Xiaojie;Dou Yanguang;Xiao Liu;Zhao Shibin;Zhang Han;Suo Fangyi(The Key Laboratory of Marine Chemistry Theory and Technology, Ministry of Education, Ocean University of China, Qingdao 266100, China;College of Chemistry and Chemical Engineering, Ocean University of China, Qingdao 266100, China;Qingdao Institute of Marine Geology, China Geological Survey, Qingdao 266100, China;China SGS-Cstc Standard Technical Service Co., LTD, Qingdao 266100, China)
出处
《中国海洋大学学报（自然科学版）》
CAS
CSCD
北大核心
2022年第4期97-104,共8页
Periodical of Ocean University of China
基金
中国地质调查局项目(DD20189230)资助。
