广西乐业天坑群中苔藓的放射性核素分析  

Radionuclide Analysis of Moss in the Leye Tiankeng Group in Guangxi

作　　者：王靓 荆巧嫣 姚冰栏 郭怡宁 匡盼 胡一粟 陈武 郭子辰 何贤文 管永精[1] WANG Liang;JING Qiaoyan;YAO Binglan;GUO Yining;KUANG Pan;HU Yisu;CHEN Wu;GUO Zichen;HE Xianwen;GUAN Yongjing(School of Physical Science and Technology,Guangxi University,Nanning,Guangxi,530004,China;Radiation Environment Management and Monitoring Station of Guangxi Zhuang Autonomous Region,Nanning,Guangxi,530222,China)

机构地区：[1]广西大学物理科学与工程技术学院,广西南宁530004 [2]广西壮族自治区辐射环境监督管理站,广西南宁530222

出　　处：《广西科学院学报》2023年第2期206-212,共7页Journal of Guangxi Academy of Sciences

基　　金：国家自然科学基金项目(12175046);广西自然科学基金项目(2021GXNSFBA196001);广西高校引进海外高层次人才“百人计划”;大学生创新创业训练计划(202110593321)资助

摘　　要：为探究广西喀斯特地貌对放射性核素分布及当地环境放射性的影响,利用高纯锗探测器对广西喀斯特地区的大曹天坑和邓家坨天坑采集来的苔藓样品中7 Be、40 K、238 U、232 Th、226 Ra、210 Pb和137 Cs的放射性比活度进行测量与分析。结果表明:在苔藓植物中,7 Be的放射性比活度为202.3-698.8 Bq/kg[平均值:(430.7±169.7)Bq/kg,n=7];40 K为33.7-159.9 Bq/kg[平均值:(91.6±44.1)Bq/kg,n=7];238 U为检测限(3.0 Bq/kg)至54.4 Bq/kg[平均值:(16.9±23.6)Bq/kg,n=7];232 Th为1.2-42.5 Bq/kg[平均值:(14.7±15.9)Bq/kg,n=7];226 Ra为0.7-48.4 Bq/kg[平均值:(16.9±20.3)Bq/kg,n=7];210 Pb为284.1-950.5 Bq/kg[平均值:(555.5±231.0)Bq/kg,n=7];137 Cs为检测限(0.1 Bq/kg)至2.3 Bq/kg[平均值:(1.1±0.9)Bq/kg,n=7]。对比后发现所有测得的数据均在正常范围内,表明天坑这一喀斯特地貌对放射性核素的分布并没有显著影响,该地区也不存在其他污染来源,同时为我国南方喀斯特地区大气示踪提供数据支撑。In order to explore the influence of karst landform on the distribution of radionuclides and the radioactivity of local environment in Guangxi,the specific activities of 7Be,40 K,238 U,232 Th,226 Ra,210 Pb and 137 Cs in moss samples collected from Dacao Tiankeng and Dengjiatuo Tiankeng in karst area of Guangxi were measured and analyzed for the first time by using high purity germanium detector.The results showed that the specific activity of 7Be in bryophytes ranged from 202.3 to 698.8 Bq/kg[mean:(430.7±169.7)Bq/kg,n=7].40 K:33.7-159.9 Bq/kg[mean:(91.6±44.1)Bq/kg,n=7];238 U was the detection limit(3.0 Bq/kg)to 54.4 Bq/kg[mean:(16.9±23.6)Bq/kg,n=7].232 Th was 1.2-42.5 Bq/kg[mean:(14.7±15.9)Bq/kg,n=7].226 Ra was 0.7-48.4 Bq/kg[mean:(16.9±20.3)Bq/kg,n=7].210 Pb was 284.1-950.5 Bq/kg[mean:(555.5±231.0)Bq/kg,n=7];137 Cs was the detection limit(0.1 Bq/kg)to 2.3 Bq/kg[mean:(1.1±0.9)Bq/kg,n=7].After comparison,it is found that all the measured data are within the normal range,indicating that the karst landform of the Tiankeng has no significant effect on the distribution of radionuclides,and there are no other sources of pollution in the area.At the same time,it provides data support for atmospheric tracing in the karst area of southern China.

关 键 词：放射性活度 苔藓 喀斯特地貌 核素示踪 7 Be 137 Cs 

分 类 号：O615.3[理学—无机化学]