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首页> 外文期刊>Environmental Geology >Radiological risk assessment of naturally occurring radioactive materials (NORMS) from selected quarry sites in Edo State, South-south, Nigeria
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Radiological risk assessment of naturally occurring radioactive materials (NORMS) from selected quarry sites in Edo State, South-south, Nigeria

机译：尼日利亚南部南部江户州某些采石场天然放射性物质的放射性风险评估

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摘要

This study was carried out to evaluate activity concentrations of naturally occurring radioactive materials (NORMs) to assess the distribution of Ra-226, Th-232, and K-40 in selected quarries in Edo State, South-south, Nigeria and to appraise the radiological hazard they may pose to the general public when used as building material. Twenty five (25) quarry samples were collected from five (5) selected quarries in the study area and their activity concentrations were measured using gamma-ray spectroscopy technique. The radiological hazard parameters: radium equivalent activity, absorbed gamma dose rate, internal and external hazard indices and annual effective dose were also determined. The average activity concentrations of Ra-226 and Th-232 from all the quarries are observed to be higher than internationally recommended value. The average activity concentrations of K-40 from two quarries were found to be below the internationally recommended value while it is higher in the remaining three quarries. The results also revealed that a couple of the calculated radiological hazard parameters are higher than permissible limit, hence, such quarry products may pose a radiological risks to the exposed population when used as building construction material. Correlation matrix for the activity concentrations of the NORMs and all the radiological variables is presented to determine the correlation between the variables in various samples.
机译：进行这项研究是为了评估天然放射性物质（NORM）的活动浓度，以评估Ra-226，Th-232和K-40在尼日利亚南部，南部江户州某些采石场中的分布，并评估当用作建筑材料时，它们可能对一般公众造成辐射危害。从研究区域的五（5）个选定的采石场中收集了二十五（25）个采石场样品，并使用伽马射线光谱技术测量了它们的活性浓度。还确定了放射危害参数：镭当量活性，吸收的伽马剂量率，内部和外部危害指数以及年度有效剂量。观察到所有采石场中Ra-226和Th-232的平均活动浓度均高于国际推荐值。发现两个采石场的K-40平均活动浓度低于国际建议值，而其余三个采石场的平均活动浓度更高。结果还显示，一些计算得出的放射危害参数高于允许的限值，因此，当这些采石场产品用作建筑材料时，可能会对裸露的人群造成放射风险。提出了NORMs活性浓度与所有放射学变量的相关矩阵，以确定各种样品中变量之间的相关性。

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