Calibration of Detection Efficiency in Tomographic Gamma Scanning

The calibration technique of detection efficiency is one of the most important techniques in tomographic gamma scanning (TGS) method. The calibration of detection efficiency with Monte-Carlo method was proposed. For a 3×3×3 TGS model, all 972 efficiency matrix elements were calculated by Monte-Carlo code. The experimental calibration of detection efficiency in TGS prototype was conducted. The calculated values fit the experimental data very well with relative deviation less than 5%. The results show that Monte-Carlo method used to obtain TGS efficiency is feasible and reliable.