Accurate dose rate models for UO₂ based materials in contact with water are important in the modeling of the radiolytically promoted dissolution of spent fuel. Dose rates of α-doped UO₂ and un-irradiated MOX fuel were modelled using the ASTAR and SRIM stopping power databases. Dose rates were calculated as a function of distance from the active surface. Comparisons with common dose rate calculation models and the combined Bethe-Bloch and Lindhard–Scharff (LS) equation were performed. It was shown that the ASTAR and SRIM databases could more accurately simulate an α-spectrum compared to the Bethe-Bloch-LS equation. A comparison between the continuous slowing down approximation (CSDA) and the radial projection algorithm in the SRIM program was performed, and it was shown that CSDA overestimates the range of the α-particles by a few percent. This leads to an overestimation of the α-dose rate at distances close to the maximum range of the α-particle in water. A relationship between the average dose rate to specific α-activity ratio as a function of α-energy was obtained from the calculations, which can easily be implemented in alpha dose rate calculations of a UO₂ based materials.

与水接触的基于UO ₂的材料的准确剂量率模型在放射性促进乏燃料溶解的建模中很重要。α掺杂的UO _2的剂量率和未辐照的MOX燃料使用ASTAR和SRIM停止功率数据库进行建模。剂量率被计算为与有效表面的距离的函数。与常用剂量率计算模型以及Bethe-Bloch和Lindhard-Scharff（LS）组合方程进行了比较。结果表明，与Bethe-Bloch-LS方程相比，ASTAR和SRIM数据库可以更精确地模拟α光谱。在SRIM程序中对连续减速近似（CSDA）和径向投影算法进行了比较，结果表明CSDA高估了α粒子的范围百分之几。这导致在接近水中α粒子最大范围的距离处高估了α剂量率。₂基础材料。