Natural radioactivity measurements in drinking water and ingestion dose assessment: case of the uranium bearing region of Poli, Cameroon

Q4 Medicine

International Journal of Low Radiation Pub Date : 2019-10-25 DOI:10.1504/ijlr.2019.10024898

Siaka Yvette Flore Tchuente, Yakum Ntaw Susan Younui, S. Djepang, Saïdou-

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引用次数: 4

Abstract

This study aimed at measuring radioactivity in drinking water and to assess corresponding ingestion dose to the public and the uranium toxicity. Twenty samples were collected in the uranium bearing region of Poli, Cameroon. α- and γ-spectrometry were used for radioactivity measurements. The range of activity concentrations for each radionuclide is 0.7 ± 0.3-3.5 ± 0.5 mBq.l−1 for 238U, 0.07 ± 0.03-2.1 ± 0.9 mBq.l−1 for 235U, 0.6 ± 0.2-5.1 ± 0.6 mBq.l−1 for 234U, 10 ± 1 mBq.l−1 for 226Ra, 10 ± 2-16.8 ± 2.2 mBq.l−1 for 210Po. Ingestion dose due to intake of 238U, 235U, 234U, 226Ra and 210Po in water was assessed for six age groups. The mean ingestion dose ranges from 8.8 μSv.yr−1 for adult to 123 μSv.yr−1 for infant, higher than the reference level of the committed effective dose (100 μSv.yr−1) recommended by the World Health Organisation (WHO). The uranium mass ranges between 0.014 μg.l−1 and 0.18 μg.l−1, below the reference mass which is 30 μg.l−1 showing that the uranium toxicity is low. 234U/238U isotopic ratio in water was observed with values near the equilibrium on 70% of collected samples and far from equilibrium reaching 3.09 in a borehole.

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饮用水中的天然放射性测量和摄入剂量评估:喀麦隆波利含铀地区的案例

本研究旨在测量饮用水中的放射性，并评估相应的公众摄入剂量和铀毒性。在喀麦隆波利的含铀地区收集了20个样品。采用α-和γ-光谱法测定放射性。每种放射性核素的活度浓度范围为0.7±0.3-3.5±0.5 mBq。l−1为238U, 0.07±0.03-2.1±0.9 mBq。l−1为235U, 0.6±0.2-5.1±0.6 mBq。l−1为234U, 10±1 mBq。l−1为226Ra, 10±2-16.8±2.2 mBq。l−1为210Po。对6个年龄组在水中摄入238U、235U、234U、226Ra和210Po的摄入剂量进行了评估。平均摄入剂量为8.8 μSv。成人为1 ~ 123 μSv。(1)高于世界卫生组织(WHO)推荐的承诺有效剂量参考水平(100 μSv.yr - 1)。铀的质量在0.014 μg之间。L−1和0.18 μg。L−1，低于30 μg的参考质量。L−1表明铀的毒性较低。水体中234U/238U同位素比值在70%的样品中接近平衡值，在井眼中远离平衡值达到3.09。

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来源期刊

International Journal of Low Radiation Environmental Science-Health, Toxicology and Mutagenesis

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期刊介绍： The IJLR is a peer-reviewed journal dedicated to the publication of research articles, review papers and technical notes in all domains related to low-dose radiation, among which are the biological and health effects in humans and the biota, in vitro and in vivo research on low radiation effects, regulatory and policy aspects, risk estimation and public perception.