Estimation of annual effective dose and radiation hazards due to natural radionuclides in Mount Homa, southwestern Kenya.
Estimation of annual effective dose and radiation hazards due to natural radionuclides in Mount Homa, southwestern Kenya.
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肯尼亚西南部霍马山天然放射性核素造成的年有效剂量和辐射危害的估计。
DOI：
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发表时间：
2013
影响因子：
1
通讯作者：
A. Mustapha
中科院分区：
文献类型：
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作者：
D. Otwoma;D. Otwoma;J. Patel;S. Bartilol;A. Mustapha
对肯尼亚西南部霍马山天然放射性物质的辐射危害进行了210个点的测量和44个样品的分析。现场测量的室外空气平均吸收剂量率变化范围为154.8~2280.6 nGyh(-1)。用HpGe探测系统测得的~(40)K、~(226)Ra和~(232)Th的平均浓度范围分别为915±3(-3017)、195±8(17-1447)和409±4(23-1369)Bq·kg(-1)。霍马山地区居民年有效剂量的计算范围为28.6%~1681.2，平均值为470.4微西弗。所有计算的平均放射性指数，即镭当量、代表性水平、伽马活度、外部和内部危害，都高于各国家和国际机构设定的限值。这些结果表明，霍马山地区是一个高本底辐射区。
The radiological hazard of naturally occurring radioactive material in Mount Homa in southwestern Kenya was investigated after 210 point measurements and 44 samples were analysed. In situ measured average outdoor absorbed dose rate in air using survey meters was found to vary from 154.8 to 2280.6 nGy h(-1). The mean (range) values of radioactive concentrations measured using an HpGe detection system for (40)K, (226)Ra and (232)Th were 915 ± 3 (64-3017), 195 ± 8 (17-1447) and 409 ± 4 (23-1369) Bq kg(-1), respectively. The calculated range of the annual effective dose for a person living in Homa Mountain area varied from 28.6 to 1681.2, with a mean of 470.4 µSv. All calculated average radiological indices, namely Radium equivalent, Representative level, Gamma activity, External and Internal hazard, were higher than the limits set by various national and international bodies. These results imply that Mount Homa region is a high background radiation area.