尼日尔三角洲沉积有机岩石样品中的天然放射性核素

A. Akinlua, J. Fagbemi, F.O.I. Asubiojo, N. Torto
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引用次数: 0

摘要

在尼日尔三角洲三口油井的不同深度采集了30个沉积有机岩石样本。测定了样品中的天然放射性核素,以确定其地球化学意义和放射效应。放射性核素是用伽马光谱技术测量的。确定的天然放射性核素是铀、钍和钾。40K、232Th和238U的平均活性浓度分别为2441.65±753.00、28.31±8.83和14.49±4.46 Bq/kg。根据Meji、Malu和Mefa油井放射性核素活动浓度计算的当量剂量分别为0.69-1.25、0.89-1.18和1.19-1.38毫西弗/年。这些数值略高于正常背景辐射值1毫西弗/年。样品中检测到的40K本底辐射较高,吸收剂量率和等效剂量略高,在环境中具有累积辐射效应,可能构成内在辐射健康危害。
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Natural radionuclides in Niger delta sedimentary organic rock samples
Thirty sedimentary organic rock samples were collected at different depths from three oil wells in the Niger Delta. The natural radionuclides in the samples were measured in order to determine their geochemical significance and radiological effect. The radionuclides were measured using gamma spectrometric technique. Natural occurring radionuclides identified were uranium, thorium and potassium. The average activity concentrations obtained were 2441.65±753.00, 28.31±8.83 and 14.49±4.46 Bq/kg for 40K, 232Th and 238U, respectively. The equivalent doses calculated from activity concentrations of the radionuclides ranged from 0.69–1.25, 0.89–1.18, and 1.19–1.38 mSv/year for Meji, Malu and Mefa oil wells, respectively. These values are slightly higher than the normal background radiation value of 1 mSv/year. The background radiation of 40K detected in these samples was high, the absorbed dose rate and equivalent dose was slightly high, which could pose intrinsically radiological health hazard because of their cumulative radiological effect in the environment.
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来源期刊
International Journal of Low Radiation
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.
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