辐射防护 ›› 2015, Vol. 35 ›› Issue (2): 123-128.

• 经验交流 • 上一篇    

牦牛坪稀土矿区土壤天然放射性水平评价

张琮1,2, 施泽明1,3, 阚泽忠4, 杨伟河1, 张峻基1, 魏菲1   

  1. 1.成都理工大学核技术与自动化工程学院,成都 610059;
    2.平项山市瑞平煤电有限公司德平热电厂,河南 平顶山 467000;
    3.四川省地学核技术重点实验室,成都 610059;
    4.四川省地质调查院,成都 610059
  • 收稿日期:2013-10-22 出版日期:2015-03-20 发布日期:2024-10-21
  • 通讯作者: 施泽明。E-mail:shizm@cdut.edu.cn
  • 作者简介:张琮(1988—),女,2014年毕业于成都理工大学辐射防护与环境保护专业,获硕士学位。E-mail:zhangcong0807@sina.com
  • 基金资助:
    四川省地勘基金“四川省安宁河流域湖泊及矿山生态地球化学环境调查”;四川高等学校科技创新重大培育项目“四川省西昌市邛海湖泊沉积速率及环境演化研究” 。

Evaluation of soil natural radioactive level in Maoniuping REE deposit

Zhang Cong1,2, Shi Zeming1,3, Kan Zezhong4, Yang Weihe1, Zhang Junji1, Wei Fei1   

  1. 1. Chengdu University of Technology,The College of Nuclear Technology and Automation Engineering,Chengdu 610059;
    2. Deping Thermal Plant Ruiping Coal & Electricity, Henan Pingdingshan 467000;
    3. Key Laboratory of Applied Nuclear Techniques in Geosciences of Sichuan Province,Chengdu 610059;
    4. Sichuan Institute of Geological Survey, Chengdu 610059
  • Received:2013-10-22 Online:2015-03-20 Published:2024-10-21

摘要: 利用γ能谱仪对牦牛坪稀土矿区土壤的天然放射性核素进行了现场测量,计算了γ射线空气吸收剂量率和年有效剂量,并与白云鄂博稀土矿区以及广东下庄铀矿田进行对比。研究结果显示,该地区土壤中放射性核素238U、232Th和40K的含量,分别为52.36(5.55~201.06) Bq/kg、122.33(38.04~723.70) Bq/kg、1 010.09(125.20~1 705.85) Bq/kg;γ射线空气吸收剂量率平均值177.16 Gy/h,高于全国(81.50 nGy/h)和世界(80.00 nGy/h)的平均值,也高于白云鄂博稀土矿区(120.00 nGy/h)以及广东下庄铀矿田(124.00 nGy/h)的平均值。但γ外照射有效剂量在国家标准限量控制的范围内,因此,研究区天然放射性水平尚属正常范围内。该地区稀土的开采利用造成土壤天然放射性水平较高;大面积出露上三叠统冕西花岗岩体,导致研究区土壤的天然放射性水平高于白云鄂博稀土矿区以及广东下庄铀矿田。

关键词: 能谱, γ射线空气吸收剂量率, 年有效剂量, 放射性水平

Abstract: The natural radioactivities of radionuclides in the soil of Maoniuping REE deposit were measured using gamma ray spectroscopy with its internal and external exposure index, γ exposure rate and γ external exposure effective dose calculated accordingly and then compared with that of the Baiyun Obo rare earth mining area and Xiazhuang uranium ore field in Guangdong. Results show that the main value of γ exposure rate (177.16 Gy/h) is higher than the national reference value (81.50 nGy/h), international reference value (80.00 nGy/h), Baiyun Obo rare earth mining area reference value (120.00 nGy/h) and Xiazhuang uranium ore field reference value (124.00 nGy/h)in Guangdong as well. The natural radioactivity level of study area still lies within normal range because its internal and external exposure index, γ exposure rate and gamma external exposure effective dose are within the national referenced range. Rare earth mining contributes to the higher soil natural radioactivity level of the study area; Large area exposed in Triassic crown west granite rock mass in the study area also leads to a higher natural radioactivity level of soil than Baiyun Obo rare earth mining area and Xiazhuang uranium ore field in Guangdong.

Key words: energy spectrum, γ exposure rate, annual effective dose, radioactivity level

中图分类号: 

  • X830.7