National Radioactive Waste Management Centre, Ghana Atomic Energy Commission, P.O. Box LG 80, Legon, Accra, Ghana.
J Environ Radioact. 2013 Dec;126:77-82. doi: 10.1016/j.jenvrad.2013.07.007. Epub 2013 Aug 22.
Assessments of radon and gamma radiation levels were carried out in underground artisanal gold mines in Tongo. This is one of the numerous artisanal gold mining communities in Ghana. Solid State Nuclear Track Detectors (SSNTDs) were used to estimate the mean (222)Rn concentration and dose rates during the Harmattan season (November 2010 to February 2011). The values for the (222)Rn concentration at each monitoring site ranged from 14 ± 4 Bq m(-3) to 270 ± 9 Bq m(-3), with a mean value of 98 Bq m(-3). These measurements are well below the lower action level of 500 Bq m(-3) recommended by ICRP for workplaces. The activity concentrations of (40)K, (232)Th and (238)U were determined using gamma-ray spectroscopy method. The effective dose estimates of 0.11 ± 0.02 mSv y(-1) to 0.68 ± 0.04 mSv y(-1) were below the allowable limit of 20 mSv per annum for occupational exposure control recommended by the ICRP. The total annual effective dose varied from 0.22 ± 0.04 mSv y(-1) to 1.92 ± 0.08 mSv y(-1).
在加纳众多的手工采金社区之一的 Tongo 进行了地下手工采金矿的氡和伽马辐射水平评估。使用固体核径迹探测器（SSNTD）在哈马坦季节（2010 年 11 月至 2011 年 2 月）期间估算平均（222）Rn 浓度和剂量率。每个监测点的（222）Rn 浓度值范围为 14 ± 4 Bq m(-3) 至 270 ± 9 Bq m(-3)，平均值为 98 Bq m(-3)。这些测量值远低于 ICRP 为工作场所推荐的下限值 500 Bq m(-3)。使用伽马射线能谱法测定（40）K、（232）Th 和（238）U 的活度浓度。有效剂量估算值为 0.11 ± 0.02 mSv y(-1) 至 0.68 ± 0.04 mSv y(-1)，低于 ICRP 为职业照射控制推荐的每年 20 mSv 的允许限值。总年有效剂量从 0.22 ± 0.04 mSv y(-1) 变化到 1.92 ± 0.08 mSv y(-1)。
