秦欢欢^1,2,,,
高柏²,
黄碧贤²,
张诗倩²,
刘昕瑀²
1. 东华理工大学核资源与环境国家重点实验室, 南昌 330013;
2. 东华理工大学水资源与环境工程学院, 南昌 330013

作者简介: 秦欢欢(1986-),男,博士,副教授,研究方向为水体污染防治和地下水污染模拟,E-mail:qhhasn@126.com.

通讯作者: 秦欢欢,qhhasn@126.com ;

基金项目: 国家自然科学基金资助项目（41807179）；江西省科技厅项目“气候变化和人类活动下拉萨河水文地球化学特征及其环境影响研究与技术示范”


中图分类号: X820.4

Distribution and Health Risk Assessment of Radionuclides ²³⁸U and ²³²Th in Lhasa River

Qin Huanhuan^1,2,,,
Gao Bai²,
Huang Bixian²,
Zhang Shiqian²,
Liu Xinyu²
1. State Key Laboratory of Nuclear Resources and Environment, East China University of Technology, Nanchang 330013, China;
2. School of Water Resources and Environmental Engineering, East China University of Technology, Nanchang 330013, China

Corresponding author: Qin Huanhuan,qhhasn@126.com ;

CLC number: X820.4

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摘要:为了解拉萨河中放射性核素²³⁸U和²³²Th的污染水平及其对人类的致癌风险，利用拉萨河中下游和堆龙曲支流16个采样点水样的²³⁸U和²³²Th含量，采取美国环境保护局（U.S.Environmental Protection Agency，US EPA）推荐的放射性核素健康风险评价方法，评估不同年龄人群因饮水途径摄入核素的致癌风险。结果表明，拉萨河中²³⁸U和²³²Th平均活度浓度分别为（2.62±3.46）×10^-2 Bq·L^-1和（2.3±0.478）×10^-3 Bq·L^-1，比我国地表水平均值分别高31%和低61.7%；²³⁸U和²³²Th含量沿程分别呈波动稳定和波动变化的趋势；不同人群平均总致癌风险分别为（4.81±4.61）×10^-8（幼儿组）、（2.29±1.81）×10^-8（少年组）和（3.08±2.13）×10^-8 a^-1（成年组），均低于1×10^-6 a^-1（US EPA标准）和我国地表水平均致癌风险值，但对幼儿的致癌危害最大；²³⁸U和²³²Th的致癌风险贡献率随年龄的增长分别下降和上升；建议对羊八井镇附近河水进行持续监测，确保地热资源开发不会造成拉萨河放射性核素的污染。本研究不仅可以为拉萨河放射性核素污染的研究提供参考，而且可以为拉萨河未来的环境保护提供科学依据。
关键词: 放射性核素/
拉萨河/
健康风险评估/
分布特征

Abstract:In order to understand the pollution level of radionuclides ²³⁸U and ²³²Th and their carcinogenic risks to human beings in Lhasa River, the ²³⁸U and ²³²Th contents of water samples collected from 16 sampling points in the middle and lower reaches and the Doilungqu tributary of Lhasa River were measured. The radionuclide health risk assessment method recommended by the U.S. Environmental Protection Agency (US EPA) was used to assess the carcinogenic risk caused by the intake of radionuclides in drinking water by different age groups. The results showed that the average activity concentrations of ²³⁸U and ²³²Th in Lhasa River were (2.62±3.46)×10^-2 Bq·L^-1 and (2.3±0.478)×10^-3 Bq·L^-1, respectively. The contents of ²³⁸U and ²³²Th were 31% higher and 61.7% lower than the national average level of surface water, respectively. The content of ²³⁸U fluctuated steadily along the way while the content of ²³²Th fluctuated along the way. The average total risk of cancer in different populations was (4.81±4.61)×10^-8 (children group), (2.29±1.81)×10^-8 (juvenile group) and (3.08±2.13)×10^-8 a^-1 (adult group), respectively, all of which are lower than 1×10^-6 a^-1 (US EPA standard) and the national surface water carcinogenic risk average values. The carcinogenic risk of Lhasa River is the highest to children. The contribution rate of carcinogenic risk of ²³⁸U decreases with the increase of age, while that of ²³²Th increases with the increase of age. It is suggested to monitor the river water near Yangbajing Town continuously to ensure that the development of geothermal resources will not cause radionuclide pollution in Lhasa River. This study can not only provide a reference for the study of radionuclide pollution in Lhasa River, but also provide a scientific basis for the future environmental protection of Lhasa River.
Key words:radionuclide/
Lhasa River/
health risk assessment/
distribution characteristics.

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