RESEARCHES ON THE KEY TECHNOLOGIES FOR TOMOGRAPHIC GAMMA SCANNING
Tomographic Gamma Scanning (TGS) method is one of the most advanced non-destructive assay (NDA) methods. But for measuring heterogeneously distributed media with medium-and high-density, there are still three main problems: experiments method of the calibration of detection efficiency of TGS is more difficult and complicated because of large voxels, “point-to-point model and average model can’t calculate high-density samples accurately in transmission image reconstruction and computational cost is very large for correction factor in emission image. Calibration of detection efficiency using Monte Carlo method shorten calibration cycle greatly, a new Monte Carlo statistical iteration in TGS transmission image reconstruction method which is based on MC calculation and Numerical Analysis is presented, give a chance for measuring high-density samples; the division method and pre-calculation method in reconstructing TGS emission image is used which saves a great lot of computation time and provide a fast reconstruction algorithm for emission image. Above methods apply to TGS experiment device, the relative errors between experiment and MC calibration were less 5%; the relative errors between reconstructed values and the reference values were less than 4% in transmission image; the corrected experimental results were compared to the standard values and the relative deviation was found to be 7%. It took no more than one hour to complete the reconstruction of TGS emission image for a sample model with 3×3×3 voxels using a 2.0G computer.
ZHANG Quanhu HUI Weihua LI Feng GU Zhongmao QIAN Shaojun
Xi’an Research Inst.Of High-Tech Hongqing Town, Xi’an 710025, China Xi’an Research Inst.Of High-Tech Hongqing Town, Xi’an 710025,China China Institute of Atomic Energy P.O.Box 275-48, Beijing 102413, China
国际会议
18th International Conference on Nuclear Engineering(第18届国际核能工程大会 ICONE 18)
西安
英文
1-5
2010-05-17（万方平台首次上网日期，不代表论文的发表时间）