Study on SGS with Digital Twin

摘要

A digital twin SGS (Segmented Gamma Scanning) based on a real device was developed. First, a series of real experiments were designed to verify the reliability of the digital twins, including transmission experiments and self-emission experiments. With the verified digital twins, the influence of several factors on the random error and systematic deviation of SGS was studied and the uncertainty of the results was estimated. Aiming at the transmission reconstruction distortion, the key factor affecting the systematic deviation of SGS results, an iterative method was established to correction the distortion. This method could reduce the systematic deviation of the analysis results significantly. After improvement, the correction can be simpler and more feasible. The SGS digital twin technology can also be used for SRGS (Segmented and Ringed Gamma Scanning) and TGS (Tomography Gamma Scanning), and extended to the measurement and analysis for holdup and the investigation for the source terms of decommissioning nuclear facility.