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首页> 外文期刊>Radiation Protection and Environment >Radiological assessment and geochemical characterization of the sediments of Awba Dam, University of Ibadan, Nigeria
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Radiological assessment and geochemical characterization of the sediments of Awba Dam, University of Ibadan, Nigeria

机译：尼日利亚伊巴丹大学Awba大坝沉积物的放射学评估和地球化学特征

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摘要

The distribution of natural radionuclides and geochemical parameters in the sediments of Awba Dam, University of Ibadan, Nigeria has been determined. The mean absorbed dose rates obtained were 72.3 nGy/h (upstream), 53.9 nGy/h (middle stream) and 50.29 nGy/h (downstream) with the corresponding mean annual effective dose rates of 0.09, 0.07 and 0.06 mSv/year, respectively. The geochemical analysis showed that Si, Al, Fe, Mn, Mg, Ca, Na, K, and Ti were the major elements and Zn, Cu, Cr, Rb, Ni, Ba, Ga, Ce, and Sr as heavy metals in the sediments. The moderate enrichment elements were Zn, Rb, Ba and Ga, whereas elements deficient in enrichment were Cr, Sr, Ce, Cu, and Ni. The geo-accumulation index was from unpolluted to moderately polluted environment. The enrichment factors (EF) observed in the elements indicate that these metals are entirely from crustal material or natural origin while EF >1.5 observed in Zn, Rb, Ba, and Ga suggests that the sources are more likely to be anthropogenic. The values of the radiological hazard parameter indices were below the recommended safe limits; an indication that the sediments can be used safely.
机译：确定了尼日利亚伊巴丹大学Awba大坝沉积物中天然放射性核素的分布和地球化学参数。获得的平均吸收剂量率分别为72.3 nGy / h（上游），53.9 nGy / h（中流）和50.29 nGy / h（下游），相应的年平均有效剂量率分别为0.09、0.07和0.06 mSv /年。 。地球化学分析表明，Si，Al，Fe，Mn，Mg，Ca，Na，K和Ti是主要元素，而Zn，Cu，Cr，Rb，Ni，Ba，Ga，Ce和Sr是重金属。沉积物。中度富集元素为Zn，Rb，Ba和Ga，而富集不足的元素为Cr，Sr，Ce，Cu和Ni。地质累积指数从未污染到中等污染环境。在元素中观察到的富集因子（EF）表明这些金属完全来自地壳材料或天然来源，而在Zn，Rb，Ba和Ga中观察到的EF> 1.5则表明这些来源更可能是人为来源。放射危害参数指数值低于建议的安全限值；表明可以安全使用沉淀物。

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