Determination of natural Radioactivity in Groundwater in Tanke - Ilorin, Nigeria

Q4 Environmental Science

West African Journal of Applied Ecology Pub Date : 2013-09-30 DOI:10.4314/WAJAE.V21I1

L. Nwankwo

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引用次数: 28

Abstract

A study of the radioactivity in groundwater from Tanke-Ilorin, Nigeria, has been carried out. Ten water samples were analyzed by ϒ-ray spectroscopy to determine the 226 Ra and 228 Ra concentrations. The activity concentration values range from 0.81 ± 0.08 to 7.4 ± 2.2 Bq/l for 226 Ra and from 1.8 ± 0.3 to 5.6 ± 2.6 Bq/l for 228 Ra. The derived Annual Effective Dose received by the population as a result of the ingestion of 226 Ra was estimated to range from 0.08 ± 0.01 to 0.12 ± 0.07 mSv/y with an average of 0.39 ± 0.11 mSv/yand 228 Ra range from 0.50 ± 0.32 to 1.42 ± 0.70 mSv/y with an average of 0.91 ± 0.31 mSv/y. Consequently, the Annual Effective Dose received, as a result of the combined ingestion of 226 Ra and 228 Ra, was found to range from 0.81 to 1.74 mSv/y with an average of 1.30 mSv/y. The mean contribution of both 226 Ra and 228 Ra activities to the committed effective dose from a year’s consumption of drinking water in the study area is, therefore, higher than the tolerable level of 1 mSv/y to the general public for prolonged exposure as recommended by ICRP, and much more than the new WHO recommended level of 0.1 mSv/y for drinking water.

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尼日利亚伊洛林地区地下水天然放射性的测定

对尼日利亚坦克-伊洛林地下水的放射性进行了研究。采用ϒ-ray光谱法对10个水样进行了226 Ra和228 Ra浓度的测定。226 Ra的活性浓度范围为0.81±0.08 ~ 7.4±2.2 Bq/l, 228 Ra的活性浓度范围为1.8±0.3 ~ 5.6±2.6 Bq/l。据估计，居民因摄入226 Ra而得到的年有效剂量范围为0.08±0.01至0.12±0.07毫西弗/年，平均为0.39±0.11毫西弗/年;228 Ra的范围为0.50±0.32至1.42±0.70毫西弗/年，平均为0.91±0.31毫西弗/年。因此，由于226和228 Ra的联合摄入而获得的年有效剂量范围为0.81至1.74毫西弗/年，平均为1.30毫西弗/年。因此，226 Ra和228 Ra活动对研究地区每年饮用饮用水的承诺有效剂量的平均贡献高于ICRP建议的一般公众长期接触的可容忍水平1毫西弗/年，也远高于世卫组织建议的饮用水的新水平0.1毫西弗/年。

本文章由计算机程序翻译，如有差异，请以英文原文为准。

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来源期刊

West African Journal of Applied Ecology Environmental Science-Ecology

CiteScore

0.80

自引率

0.00%

发文量

期刊介绍： This research journal has been established by the Ecological Laboratory Unit of the University of Ghana, Accra to publish original papers, invited articles and book reviews in English on general ecology. Papers are peer reviewed by consulting editors. The journal is targeted at scientists, policy makers and the general public. The subject areas to be covered include the following: -Theoretical and Applied Ecology- Environmental Studies- Environmental Management- Population Studies- Sustainable use of Natural Resources- Atmospheric Science- Aquatic Sciences and Oceanography- Terrestrial Ecology- Soil Sciences- Human Settlements- Disaster Preparedness and Disaster Reduction- Sustainable Development- Traditional Knowledge on Biodiversity and its sustainable use- Application in Agriculture and Land Use- Health and Environmental Protection