文摘
环境特征和自然辐射影响力红海海岸的山脉,埃及
作者(年代):票价,Hassan AK El-Saeedy嗨,Alshahrani B和Yakout H花岗岩山脉通常含有一定量的天然放射性衰变的结果的铀,钍和40 k同位素。计算岩石山的浓度水平的知识空间分布和这些同位素来源是非常重要的,以避免由此产生的负面影响。目前的工作重点是调查分布、环境效应和235 u的来源,238 u,总值的232,以及活动β和α岩石在一些地方在这山脉。另外,岩石样本分析的高分辨率伽马光谱仪技术。结果发现显著差异在放射性的采样站点的变异和澄清一个相对高浓度的238 u在某些地点。226 ra 238 u的活动,232和40 k测量以及辐射风险参数计算的样本。活动的平均浓度(238 u 226 ra 232和40 k)分别为191.71±23.55,177.49±25.62,65.88±6.48,192.66±23.19分别Bq /公斤。年有效剂量率(mSv / y),吸收剂量率的均值(D),镭等效(Raeq),外部风险指数(十六进制)和内部风险指数(Hin)和代表水平指数(IγIα);0.25 mSv / y, 205.64 nGy / h, 1.01毫西弗/ y,分别286.90 Bq /公斤1.97和0.89。一些样品的辐射危险参数计算是低于全球平均水平和其他高于全球平均水平。 The (Hex, Hin, Iα and Iγ) exceeded the unity and out of the human health safe limit and it may be harmful to the peoples in the region. Most of the 238U concentrations in the rock are below the World Health Organization permissible limit for rock. The relatively high uranium concentrations in some rock samples suggest a long period of geochemical interactions between rocks, sediments and water. The results indicate higher levels of the activity of 222Rn and 226Ra lower than the permissible limits for rock. The specific activity ratios of 226Ra/238U and 232Th/238U were calculated for evaluation of the behaviors of these radionuclides. These results give the basic values for the distribution of natural radionuclides in the region and will be used as reference information to determine any future changes.
