Concentration and distribution characteristics of gross alpha, ²³⁸U, ²³⁴U and ²²⁶Ra in freshwater of some rivers and artificial lakes in southeast Vietnam.

IF 1.8 3区工程技术 Q3 CHEMISTRY, INORGANIC & NUCLEAR

Applied Radiation and Isotopes Pub Date : 2025-07-21 DOI:10.1016/j.apradiso.2025.112064

Minh An Dinh, Nhut Tan Tran, Van Thang Nguyen, Xuan Anh Dao Lam, Truc Phuong Huynh, Cong Hao Le

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引用次数: 0

Abstract

Rivers and artificial lakes are the major sources that supply freshwater to communities, cities, agriculture, and industry. However, this water type is normally polluted by radionuclides, which are from groundwater discharge, surface soil runoff, or Naturally Occurring Radionuclides (NOR) effluents. In this study, gross alpha and alpha-emitting radionuclides (²³⁴U, ²³⁸U and ²²⁶Ra) were analysed in freshwater samples collected in 31 sites in two rivers and four quarry lakes in Southeast Vietnam. The analyses were conducted in two separate parts of water: suspended matter and filtered water. The mean gross alpha, ²³⁴U, ²³⁸U and ²²⁶Ra activities in unfiltered water were 52.9, 8.2, 7.9, and 6.1 mBq L^-1, respectively. These values remain within the recommendations of the United States Environmental Protection Agency (USEPA) and World Health Organization (WHO) for the contamination of radionuclides in drinking water. High activities were found in the water of the Sai Gon River due to the impact of pollutants from the densely populated and industrial zones. Ratios of ²³⁴U/²³⁸U were found to be slightly >1, while ratios of ²²⁶Ra/²³⁴U and ²²⁶Ra/²³⁸U were found to be < 1. Radionuclides ²³⁴U, ²³⁸U and ²²⁶Ra contribute significantly to the gross alpha in both rivers and artificial lakes. Strong linear correlations were found between the activities of alpha-emitting radionuclides and gross alpha in quarry lake water (Pearson correlation coefficient p > 0.7). For two types of freshwater, a significant amount of gross alpha, alpha-emitting radionuclides, was found in the suspended solids of water. The suspended matter/water partition coefficients (K_sw) for two types of water were 1.23 × 10⁵, 1.66 × 10⁴, 1.55 × 10⁴, and 9.7 × 10³ L kg^-1 for gross alpha, ²³⁴U, ²³⁸U and ²²⁶Ra, respectively. K_sw values of the gross alpha and radionuclides for river water are significantly higher than those in quarry lake water.

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越南东南部部分河流和人工湖淡水中总α、238U、234U和226Ra的浓度及分布特征

河流和人工湖是向社区、城市、农业和工业提供淡水的主要来源。然而，这种类型的水通常受到放射性核素的污染，这些放射性核素来自地下水排放、地表土壤径流或自然发生的放射性核素（NOR）流出物。在这项研究中，在越南东南部两条河流和四个采石场湖泊的31个地点收集的淡水样本中分析了总α和α发射放射性核素（234U， 238U和226Ra）。分析是在水的两个不同部分进行的：悬浮物和过滤水。未经过滤的水中alpha、234U、238U和226Ra的平均活性分别为52.9、8.2、7.9和6.1 mBq L-1。这些数值仍在美国环境保护署（epa）和世界卫生组织（世卫组织）关于饮用水中放射性核素污染的建议范围内。受人口密集地区及工业区污染物的影响，西贡河的河水有较高的活度。发现234U/238U的比值略大于1，而226Ra/234U和226Ra/238U的比值为234U， 238U和226Ra对河流和人工湖的总α有显著贡献。在采石场湖水中α释放放射性核素的活度与总α之间发现了很强的线性相关（Pearson相关系数p > 0.7）。对于两种淡水，在水中悬浮的固体中发现了大量的总α，即释放α的放射性核素。两种水对总α、234U、238U和226Ra的悬浮物/水分配系数（Ksw）分别为1.23 × 105、1.66 × 104、1.55 × 104和9.7 × 103 L kg-1。河流水的总α和放射性核素的Ksw值显著高于采石场湖水。

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来源期刊

Applied Radiation and Isotopes 工程技术-核科学技术

CiteScore

3.00

自引率

12.50%

发文量

406

审稿时长

13.5 months

期刊介绍： Applied Radiation and Isotopes provides a high quality medium for the publication of substantial, original and scientific and technological papers on the development and peaceful application of nuclear, radiation and radionuclide techniques in chemistry, physics, biochemistry, biology, medicine, security, engineering and in the earth, planetary and environmental sciences, all including dosimetry. Nuclear techniques are defined in the broadest sense and both experimental and theoretical papers are welcome. They include the development and use of α- and β-particles, X-rays and γ-rays, neutrons and other nuclear particles and radiations from all sources, including radionuclides, synchrotron sources, cyclotrons and reactors and from the natural environment. The journal aims to publish papers with significance to an international audience, containing substantial novelty and scientific impact. The Editors reserve the rights to reject, with or without external review, papers that do not meet these criteria. Papers dealing with radiation processing, i.e., where radiation is used to bring about a biological, chemical or physical change in a material, should be directed to our sister journal Radiation Physics and Chemistry.