Population dose distribution due to soil radioactivity concentration levels in 18 cities across Nigeria
Population dose distribution due to soil radioactivity concentration levels in 18 cities across Nigeria
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DOI：
10.1088/0952-4746/25/3/007
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发表时间：
2005-09
影响因子：
1.5
通讯作者：
R. Obed;I. P. Farai;N. Jibiri
中科院分区：
文献类型：
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作者：
R. Obed;I. P. Farai;N. Jibiri
使用伽马射线光谱法测定了从尼日利亚六个地理政治区18个城市的186个地点收集的土壤样品中的天然放射性浓度。结果表明，土壤样品中40K，238U和232Th的浓度从低于检测限（BDL）到1459.4 Bq kg−1不等，40K的平均值为73.3 ± 18.5 Bq kg−1，而238 U和232 Th的值在9.2至113.7 Bq kg−1之间变化，平均值为33.9 ± 7.4 Bq kg−1，在BDL至175.7 Bq kg−1之间变化，平均值为12.4 ± 3.1 Bq kg− 1，分别各城市空气中的平均γ吸收剂量率在19 ± 5和88 ± 44 nGy h−1之间，总平均值为42.0 ± 21.0 nGy h−1。根据研究地区现有的人口数据，约2.84%的人口受到的辐射剂量率低于20 nGy h−1，52.40%的人口受到的辐射剂量率在20至30 nGy h−1之间，31%的人口受到的辐射剂量率在30至60 nGy h −1之间，约13.76%的人口受到的辐射剂量率大于60 nGy h−1。
The natural radioactivity concentrations in soil samples collected from 186 locations across 18 cities in the six geo-political zones of Nigeria have been determined using gamma-ray spectrometry. Results show that the concentrations of 40K, 238U and 232Th in the soil samples varied from below detection limits (BDL) to 1459.4 Bq kg−1 with a mean of 73.3 ± 18.5 Bq kg−1 for 40K, whereas for 238U and 232Th values varied from 9.2 to 113.7 Bq kg−1 with a mean of 33.9 ± 7.4 Bq kg−1 and from BDL to 175.7 Bq kg−1 with a mean of 12.4 ± 3.1 Bq kg−1, respectively. The average gamma absorbed dose rate in air across the cities ranged between 19 ± 5 and 88 ± 44 nGy h−1 and the gross mean was 42.0 ± 21.0 nGy h−1. Using available population data in the study areas, about 2.84% of the population is exposed to a radiation dose rate of less than 20 nGy h−1, 52.40% to a radiation dose rate between 20 and 30 nGy h−1, 31% to a radiation dose rate between 30 and 60 nGy h−1 and about 13.76% to dose rates greater than 60 nGy h−1.