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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.广西乐业天坑群中苔藓的放射性核素分析[J].广西科学院学报,2023,39(2):206-212. [点击复制]
- WANG Liang,JING Qiaoyan,YAO Binglan,GUO Yining,KUANG Pan,HU Yisu,CHEN Wu,GUO Zichen,HE Xianwen,GUAN Yongjing.Radionuclide Analysis of Moss in the Leye Tiankeng Group in Guangxi[J].Journal of Guangxi Academy of Sciences,2023,39(2):206-212. [点击复制]
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| 广西乐业天坑群中苔藓的放射性核素分析 |
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王靓1, 荆巧嫣1, 姚冰栏1, 郭怡宁1, 匡盼1, 胡一粟1, 陈武1, 郭子辰1, 何贤文2, 管永精1
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| (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) |
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| 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7Be、40K、238U、232Th、226Ra、210Pb和137Cs的放射性比活度进行测量与分析。结果表明：在苔藓植物中, 7Be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]；40K为33.7-159.9 Bq/kg [平均值：(91.6±44.1) Bq/kg, n=7]；238U为检测限(3.0 Bq/kg)至54.4 Bq/kg [平均值：(16.9±23.6) Bq/kg，n=7]；232Th为1.2-42.5 Bq/kg [平均值：(14.7±15.9) Bq/kg, n=7]；226Ra为0.7-48.4 Bq/kg [平均值：(16.9±20.3) Bq/kg，n=7]；210Pb为284.1-950.5 Bq/kg [平均值：(555.5±231.0) Bq/kg, n=7]； 137Cs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。 |
| 关键词: 放射性活度 苔藓 喀斯特地貌 核素示踪 7Be 137Cs |
| DOI：10.13657/j.cnki.gxkxyxb.20230517.011 |
| 投稿时间：2022-10-30修订日期：2022-12-16 |
| 基金项目: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”和大学生创新创业训练计划(202110593321)资助 |
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| Radionuclide Analysis of Moss in the Leye Tiankeng Group in Guangxi |
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WANG Liang1, JING Qiaoyan1, YAO Binglan1, GUO Yining1, KUANG Pan1, HU Yisu1, CHEN Wu1, GUO Zichen1, HE Xianwen2, GUAN Yongjing1
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| (1.School of Physical Science and Technology, Guangxi University, Nanning, Guangxi, 530004, China;2.Radiation-Environment Management and Monitoring Station of Guangxi Zhuang Autonomous Region, Nanning, Guangxi, 530222, China) |
| Abstract: |
| 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, 40K, 238U, 232Th, 226Ra, 210Pb and 137Cs 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]. 40K: 33.7-159.9 Bq/kg [mean: (91.6±44.1) Bq/kg, n=7];238U was the detection limit (3.0 Bq/kg) to 54.4 Bq/kg [mean: (16.9±23.6) Bq/kg, n=7]. 232Th was 1.2-42.5 Bq/kg [mean: (14.7±15.9) Bq/kg, n=7]. 226Ra was 0.7-48.4 Bq/kg [mean: (16.9±20.3) Bq/kg, n=7]. 210Pb was 284.1-950.5 Bq/kg [mean: (555.5±231.0) Bq/kg, n=7];137Cs 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. |
| Key words: radioactivity moss karst landform nuclide tracing 7Be 137Cs |
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