评估加纳塔夸金矿采矿和矿物加工活动导致的公众自然放射性材料暴露情况。
Assessment of public exposure to naturally occurring radioactive materials from mining and mineral processing activities of Tarkwa Goldmine in Ghana.
机构信息
Radiation Protection Institute, Ghana Atomic Energy Commission, P.O. Box LG 80, Legon, Accra, Ghana.
出版信息
Environ Monit Assess. 2011 Sep;180(1-4):15-29. doi: 10.1007/s10661-010-1769-9. Epub 2010 Nov 12.
Studies have been carried out in a Goldmine in Ghana to determine the exposure of the public to naturally occurring radioactive materials from processing of gold ore. Direct gamma spectrometry and neutron activation analysis techniques were used to analyse soil, rock, water and dust samples from the mining environment. The mean activity concentrations measured for (238)U, (232)Th and (40)K in the soil/rock samples were 15.2, 26.9 and 157.1 Bq kg( - 1), respectively. For the water samples, the mean activity concentrations were 0.54 and 0.41 Bq l( - 1)) and 7.76 Bq l( - 1) for (226)Ra, (232)Th and (40)K, respectively. The mean activity concentrations measured in the dust samples were 4.90 and 2.75 μBq m( - 3) for (238)U and (232)Th, respectively. The total annual effective dose to the public was estimated to be 0.69 mSv. The results in this study compared well with typical world average values. The results indicate an insignificant exposure of the public from the activities of the Goldmine.
本研究在加纳的一个金矿进行，以确定公众在处理金矿矿石过程中接触到的天然放射性物质。采用直接伽马能谱法和中子活化分析技术对采矿业环境中的土壤、岩石、水和灰尘样品进行分析。土壤/岩石样品中（238）U、（232）Th 和（40）K 的平均活度浓度分别为 15.2、26.9 和 157.1 Bq kg（-1）。水样品中（226）Ra、（232）Th 和（40）K 的平均活度浓度分别为 0.54 和 0.41 Bq l（-1）和 7.76 Bq l（-1）。灰尘样品中（238）U 和（232）Th 的平均活度浓度分别为 4.90 和 2.75 μBq m（-3）。公众的年有效剂量估计为 0.69 mSv。本研究的结果与世界典型平均值相当。结果表明，金矿的活动对公众的照射是微不足道的。
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