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本文介绍了一种有限烟云外照射剂量计算方法——光子“射程”法 ,该方法的特点是将受照者周围一个以光子在空气中平均自由程 (文中简称为“射程”)的 5倍范围内的烟云划分为一些体积元来计算其外照射剂量 (或剂量率 )。计算出的空气外照射剂量转换因子和空气吸收剂量率与有关文献给出的值或图解法、离散点近似法的计算结果相当一致。该方法适于与三维数值大气扩散模式配合使用。
In this paper, a method for calculating the dose of extinction radiation from a limited cloud of smoke, a photon “range” method, is introduced. The method is characterized by irradiating a photon with a distance of 5 times the average free path of photons in air (referred to herein as “range” Smoke clouds within the range are divided into some volume elements to calculate their external exposure dose (or dose rate). Calculated air dose conversion factor of air and air absorption dose rate and the value given by the literature or graphic method, discrete point approximation of the calculation results are quite consistent. The method is suitable for use with the three-dimensional numerical atmospheric diffusion model.