伊朗里海南岸238U、232Th、40K和137Cs的活度浓度
238U, 232Th, 40K and 137Cs activity concentrations along the southern coast of the Caspian Sea, Iran.
作者信息
Abdi Mohammad Reza, Hassanzadeh Smaeyl, Kamali Mehdi, Raji Hamid Reza
机构信息
Department of Physics, Faculty of Sciences, University of Isfahan, Isfahan 81746-73441, Iran.
出版信息
Mar Pollut Bull. 2009 May;58(5):658-62. doi: 10.1016/j.marpolbul.2009.01.009. Epub 2009 Mar 3.
The determination of activity concentrations of the radioactive elements (238)U, (232)Th, (40)K and (137)Cs was performed on grab samples taken from a polluted environment. The samples were sliced into strata from 5 cm depth, dried and ground to sieved through a 170 mesh size prior to the analysis. Activity concentration was quantified using gamma spectroscopy. The results showed that the concentrations of activity in the sediment samples are 177+/-12.4, 117+/-11.5, 1085+/-101.6 and 131+/-4.8 Bq kg(-1) for (238)U, (232)Th, (40)K and (137)Cs, respectively. In general, the distribution of activity concentrations along the southern coast of the Caspian Sea area exceeded international limits. The hazard index of the samples was 0.19-0.88, with an average of 0.49. The mean values of radium equivalent activity and dose rate are 176 Bq kg(-1) and 63 nGy h(-1), respectively.
对从污染环境采集的抓取样本进行了放射性元素（238）U、（232）Th、（40）K和（137）Cs活度浓度的测定。样本从5厘米深度切成层，干燥并研磨，以便在分析前通过170目筛网筛分。使用伽马能谱法定量活度浓度。结果表明，沉积物样本中（238）U、（232）Th、（40）K和（137）Cs的活度浓度分别为177±12.4、117±11.5、1085±101.6和131±4.8 Bq kg-1。总体而言，里海地区南部海岸沿线的活度浓度分布超过了国际限值。样本的危害指数为0.19 - 0.88，平均为0.49。镭当量活度和剂量率的平均值分别为176 Bq kg-1和63 nGy h-1。
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