罗斯特曼金矿尾矿库自然放射性核素所致放射性危害估算，肯尼亚卡卡梅加卢拉米。

ESTIMATION OF RADIOLOGICAL HAZARDS DUE TO NATURAL RADIONUCLIDES FROM THE ROSTERMAN GOLD MINE TAILINGS, LURAMBI, KAKAMEGA, KENYA.

机构信息

Department of Science, Technology and Engineering, Kibabii University, P.O BOX 1699-50200 Bungoma, Kenya.

Department of Physical Sciences, South Eastern Kenya University, P.O BOX 170-90200 Kitui, Kenya.

出版信息

Radiat Prot Dosimetry. 2020 Sep 16;190(3):324-330. doi: 10.1093/rpd/ncaa113.

DOI:10.1093/rpd/ncaa113

PMID:32852035

Abstract

Radiological hazards associated with naturally occurring radionuclides in materials from Rosterman gold mine were assessed by analysis of 30 samples. The gamma-ray spectrometric analysis of tailing samples reported an average activity concentration of 263 ± 13, 123 ± 6 and 84 ± 4 Bq kg-1 for 40K, 232Th and 226Ra, respectively. The average absorbed dose rate was 124 ± 6 nGy h-1, while the annual effective dose of 0.4 ± 0.02 mSv y-1 for indoor and 0.3 ± 0.01 mSv y-1 for outdoor were reported. The mean and range of radiological parameters (external and radium equivalent) calculated from the tailing samples were within the permissible limits and hence mining of gold at Rosterman has no significant radiological health implication on the miners and the surrounding population.

摘要

采用伽马能谱分析法对罗斯特曼金矿的 30 个物料样品进行分析，评估了其中天然放射性核素的放射性危害。尾渣样品的分析结果显示，钾-40、钍-232 和镭-226 的平均活度浓度分别为 263±13、123±6 和 84±4 Bq/kg。平均吸收剂量率为 124±6 nGy/h，室内年有效剂量为 0.4±0.02 mSv/y，室外年有效剂量为 0.3±0.01 mSv/y。尾渣样品计算得到的放射性参数（外照射和镭当量）的平均值和范围均在允许限值内，因此，罗斯特曼金矿的开采对矿工和周围居民的放射性健康没有显著影响。