The absorbed dose rate of external γ-radiation from two sources of radiation – surface soil layer and subsurface phytomass of plants in stand grass – is calculated by different methods. The calculation of the absorbed dose rate based on integration of the dose attenuation function of a point source taking into account the dose accumulation factor was compared with the results of a Monte Carlo solution of the radiation transfer equation (MCNP5 code system). The obtained results show that the absorbed dose rate of external γ-radiation in the air-plant medium can be calculated by integrating the dose attenuation function of a point source with variable radionuclide activity and biometric parameters of the plants.

中文翻译：

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在草甸生物地球中心被放射性污染的情况下计算γ-辐射吸收剂量率的方法

来自两种辐射源——表层土壤层和立草植物的地下植物群——的外部γ辐射的吸收剂量率是通过不同的方法计算的。将基于点源剂量衰减函数积分的吸收剂量率计算与辐射传递方程（MCNP5 代码系统）的蒙特卡罗解法的结果进行了比较，同时考虑了剂量累积因子。所得结果表明，通过对具有可变放射性核素活度和植物生物特征参数的点源的剂量衰减函数进行积分，可以计算空气植物介质中外部γ辐射的吸收剂量率。