Estimation of mixed nuclide inventory using microshield computer program

The methods for evaluating the gamma nuclide inventory present on the inner surface of component subject to decommissioning Nuclear Power Plant are LABSOCS (Laboratory SOurceless Calibration Software) that indirectly measures a sample that can demonstrate the representativeness of component subject to decommissioning, ISOCS (In Situ Object Counting System) that measures directly from the surface of a component subject to decommissioning, and MicroShield® computer program that estimates the nuclide inventory on the inner surface of component using the dose rate of component subject to decommissioning and the radioactivity of the sample. In this study, we estimated the nuclide inventory on the inner surface of the pipe using the dose rate of the pipe subject to decommissioning and the radioactivity concentration of the sample by MicroShield® ver. 10.03 computer program. In this study, we estimated the nuclide inventory in the pipe according to the dose rate of pipe and the radioactivity concentration of the sample by using MicroShield® ver. 10.03 computer program. On the other hand, since the components subject to decommissioning have complicated shape and various materials, optimal modeling for this is important. In addition, for accurate error range and applicability, it is necessary to verify the validity of ISOCS and LABSOCS by performing radioactivity measurement and mutual comparison and analysis