Assessment of γ–radiation levels and associated dose rates from surface soils in the eastern part of Botswana

Alfred Sello Likuku, N. Karunakara, G. P. Nthoiwa
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Abstract

This paper reports the γ–radiation levels of the naturally occurring 40K, 210Pb, 232Th and 226Ra and the anthropogenic 137Cs in the eastern part of Botswana so as to assess their possible dose impact to the members of the public in the area. The radium equivalent activity was (175±24) Bq/kg, and thus below the allowed maximum value of 370 Bq/kg. The total absorbed rate ranged from 24.12 nGy/h to 215.44 nGy/h with the mean of (81.36±10.58) nGy/h. The outdoor annual effective dose ranged from 0.030 mSv/y to 0.264 mSv/y with an average value of (0.10±0.01) mSv/y. The obtained values are comparable with world–wide averages. Results from this study can be used to serve as baseline data for the study area, which can also be used as reference information to assess any changes in radioactivity background possibly due to the artificial influences.
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博茨瓦纳东部表层土壤γ辐射水平和相关剂量率的评估
本文报道了博茨瓦纳东部自然产生的40K、210Pb、232Th和226Ra以及人为产生的137Cs的γ辐射水平,以评估其对该地区公众可能产生的剂量影响。镭当量活度为(175±24)Bq/kg,低于370 Bq/kg的允许最大值。总吸收率为24.12 ~ 215.44 nGy/h,平均值为(81.36±10.58)nGy/h。室外年有效剂量范围为0.030 ~ 0.264 mSv/y,平均值为(0.10±0.01)mSv/y。所获得的数值可与世界平均值相比较。这项研究的结果可作为研究区域的基线数据,也可作为参考资料,以评估可能因人为影响而导致的放射性本底变化。
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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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