主要核素关联法对某型低本底大物品污染监测仪的适用性研究

摘要/Abstract

摘要： 针对某型低本底大物品污染监测仪,利用MCNP5程序模拟评估了主要核素关联法(LNC法)对其适用性。通过建立该型设备的MCNP模型,计算得到LNC法的各个参数;结合核电站实际工况,使用MCNP5程序的F8卡计算了不同条件(材质、密度、装填度、核素分布)下该型设备的计数率,在此基础上,分别使用LNC法、设备内置活度计算方法计算了活度,并与真实活度进行了对比。结果表明,在不同条件下,利用LNC法得到的活度与真实活度之间的相对偏差小于±15%,而使用设备内置方法计算出的活度相对偏差最大达-77.5%,表明LNC法具有显著优势。在进行核电站放射性固体废物清洁解控测量时,LNC法适用于该型设备。

关键词: 主要核素关联法, 蒙特卡罗模拟, 放射性固体废物, 清洁解控, 活度测量

Abstract: This work evaluates the applicability of the Leading Nuclide Correlation (LNC) method to a specific low-background large-object radioactive contamination monitor, using the MCNP5 code. A MCNP model was developed to determine the key parameters required for the LNC method. Considering actual nuclear power plant conditions, the F8 tally was employed to calculate detector count rates across varied scenarios—including different materials, densities, filling fractions, and nuclide distributions. The activity values obtained from the LNC method and the equipment’s built-in algorithm were then compared against the reference values. The results indicate that the relative deviation associated with the LNC method remained consistently within ±15% across all experimental conditions, whereas the built-in algorithm yielded relative deviations as high as -77.5% under extreme scenarios, demonstrating the superior performance of the LNC method. This study confirms the technical applicability of the LNC method for clearance measurements of radioactive solid waste at nuclear power plants using this type of equipment.

Key words: leading nuclide correlation method, monte carlo simulations, radioactive solid waste, clearance, activity measurement

中图分类号:

TL81

吕鑫盛, 郭英蕾, 李丹. 主要核素关联法对某型低本底大物品污染监测仪的适用性研究[J]. 辐射防护, 2026, 46(2): 134-141.

LYU Xinsheng, GUO Yinglei, LI Dan. A study on the applicability of the leading nuclide correlation method to a low-background large-object radioactive contamination monitor[J]. RADIATION PROTECTION, 2026, 46(2): 134-141.

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