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Analysis of the distributional effects of radioactive materials on external gamma exposure

机译:放射性物质对外部γ辐射的分布效应分析

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The distributional effects of radioactive materials on external gamma exposure have been analyzed. An approximate method for estimating external gamma dose given from an arbitrary distribution of radioactive materials has been developed. The minimum gamma expo- sure given from a point source is shown at 0.07 MeV if the source to receptor distance is shorter than l0 m. But, if the receptor to point source distance is longer than 20 m, the gamma exposure rate increases monotonously according to the average gamma energy. For the analysis of the effects of volume source, we estimated the gamma dose given from different hemisphere sizes in which radioactive, materials are distributed uniformly. When the radius of the hemisphere is longer than 40 m, the external gamma dose rate increases monotonously. The gamma dose rate given from the radioactive materials deposited on the ground shows the minimum value at 0.07 MeV in any case. The analysis shows that external gamma exposure is strongly dependent on the distribution of radioactive materials in the environment and gamma energy.
机译:分析了放射性物质对外部γ辐射的分布影响。已经开发出一种估算方法,该方法可以估算任意放射性物质分布给定的外部伽马剂量。如果源到受体的距离短于10 m,则从点源给出的最小伽玛暴露值显示为0.07 MeV。但是,如果受体到点源的距离大于20 m,则伽马暴露率会根据平均伽马能量单调增加。为了分析体积源的影响,我们估算了放射性物质均匀分布在不同半球尺寸下的伽马剂量。当半球半径大于40 m时,外部伽马剂量率单调增加。在任何情况下,从沉积在地面上的放射性物质得出的伽马剂量率都显示为最小值,为0.07 MeV。分析表明,外部γ辐射强烈依赖于环境中放射性物质的分布和γ能量。

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