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OA

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.