A Density Correction Method for Radioactive Waste Drum Based on Srgs Technology

Abstract

The Segmented Ringed Gamma Scanning (SRGS) technique represents an advancement in the Segmented Gamma Scanning (SGS) technology used for radioactive waste drum detection, offering enhanced measurement accuracy. However, there are significant errors in the reconstruction of matrix densities, due to the non-uniform distribution of density of radioactive waste and conical beam out from the transmission source collimator. This paper proposed a density correction method based on dichotomy aiming to address this issue. The efficacy of this method was verified through both simulations and experiments on a sample containing five different materials, using 137Cs and 60Co for transmission and emission measurements, respectively. The simulation and experiments results show that the errors of the corrected matrix densities are greatly reduced, falling within the margins of 8.0% and 16.8%. Meanwhile, the corrected reconstruction error of the activity is approximately a quarter of the uncorrected result.

Keywords: Radioactive waste, Segmented-Ringed Gamma Scanning, Segmented Gamma Scanning, Density correction.