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Investigation of potential environmental radiation risks associated with artisanal gold mining in Zamfara State, Nigeria
Environmental Earth Sciences ( IF 2.8 ) Pub Date : 2021-01-17 , DOI: 10.1007/s12665-021-09367-2
N. N. Garba , C. M. Odoh , R. Nasiru , M. A. Saleh

A total number of 166 average measurements were taken using a handheld radiation meter. The mean terrestrial gamma radiation dose rate (TRD) was 32 nGy h−1 which is less than the world average value of 59 nGy h−1. Kaura Namoda has the highest TRD with a value of 38 nGy h−1, while Bakura has the lowest TRD with a value of 28 nGy h−1. The mean activity concentrations of 226Ra, 232Th and 40 K in soil samples were measured using HPGe and were found to be 18 ± 2 Bq kg−1, 22 ± 3 Bq kg−1 and 251 ± 7 Bq kg−1, respectively. Highest activities of 226Ra, 232Th and 40 K were all found to be in Zurmi local government area with respective values of 31 ± 3 Bq kg−1, 34 ± 3 Bq kg−1 and 419 ± 10 Bq kg−1. The radiological hazards indices associated with the measured activity concentrations were determined as 69 Bq kg−1, 0.2, 0.24, 32 nGyh−1 and 0.05 mSvy−1 for radium equivalent (Raeq), external hazard index (Hex), absorbed dose rate (DR) and annual effective dose (AED), respectively. It can be concluded that despite the illegal mining activities within the area, the radiation exposure level in the area is normal and will not pose any immediate radiation effect to humans and their environs.



中文翻译:

尼日利亚赞法拉州与手工金矿开采相关的潜在环境辐射风险调查

使用手持式辐射计进行了166次平均测量。地面伽马平均辐射剂量率(TRD)为32 nGy h -1,小于世界平均值59 nGy h -1。Kaura Namoda的TRD最高,值为38 nGy h -1,而Bakura的TRD最低,值为28 nGy h -1。的平均活动浓度226镭,232 Th和40 土壤样品以K用的HPGe进行测定,发现是18±2贝千克-1,22±3贝千克-1和251±7贝千克-1,分别。226 Ra的最高活动,232 Th和40  K含量都发现在Zurmi地方政府面积与31±3贝公斤的各自的值-1,34±3贝千克-1和419±10公斤贝-1。与所测量的活性浓度相关联的放射性危害指数确定为69公斤贝-1,0.2%,0.24,32 nGyh -1和0.05 mSvy -1为镭当量(RA当量),外部危险指数(ħ EX),吸收剂量率(D R)和年度有效剂量(AED)。可以得出结论,尽管该区域内有非法采矿活动,但该区域的辐射暴露水平是正常的,不会对人类及其周围环境造成任何直接的辐射影响。

更新日期:2021-01-18
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