Natural radioactivity assessments and radiological hazards in agricultural soils around mining activities in Karibib, Namibia

Nuclear Analysis Pub Date : 2025-03-01 DOI:10.1016/j.nucana.2025.100155

Sylvanus Ameh Onjefu , Biere Peter Ebibuloami , Caspah Kamunda , Markus Hitila , Marius Kudumo Mutorwa , Jeya Kudi Kennedy , Euodia Hess , Damian C. Onwudiwe

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Abstract

A total of 17 soil samples were randomly collected from agricultural farms around mining areas from Karibib, Erongo region, Namibia. The samples were analyzed for natural radioactivity using a high purity germanium (HPGe) detector. The average activity concentrations of ²²⁶Ra, ²³²Th and ⁴⁰K were 80.80, 73.60, and 493.96 Bq.kg ^{– 1} respectively. The radiological assessments were calculated in terms of radium equivalent activity (224.09 Bq.kg ^{– 1}), absorbed dose rate (102.39 nGy h-¹), annual effective dose equivalent (indoor and outdoor) (1.26 mSv y ^{– 1} and 5.02 mSv y ^{– 1}) and the internal and external hazard indices (0.61) and (0.82) respectively. The average values of ²²⁶Ra, ²³²Th and ⁴⁰K were higher than the world average values as well as those of the radiological parameters of absorbed dose rate and annual effective dose equivalent. The average values of radium equivalent activity, and the indices radiological hazards were below the internationally acceptable limits.

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纳米比亚卡里比卜采矿活动周围农业土壤的自然放射性评估和放射性危害

从纳米比亚Erongo地区Karibib矿区周围的农场随机收集了17个土壤样本。使用高纯度锗（HPGe）探测器分析样品的天然放射性。226Ra、232Th和40K的平均活性浓度分别为80.80、73.60和493.96 Bq。分别是Kg - 1。放射学评估以镭当量活度（224.09 Bq）计算。kg -1)、吸收剂量率（102.39 nGy h-1）、年有效剂量当量（室内和室外）（1.26 mSv y -1和5.02 mSv y -1）以及内外危害指数（0.61）和（0.82）。226Ra、232Th和40K的平均值高于世界平均值，吸收剂量率和年有效剂量当量等放射学参数的平均值也高于世界平均值。镭当量活度平均值和辐射危害指数均低于国际可接受限值。

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来源期刊

Nuclear Analysis

CiteScore

1.70

自引率

0.00%

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