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Tomographic Gamma Scanning Technique for Radioactivity Detection of Nuclear Waste Drum
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LIU Cheng1,WANG Dezhong1,QI Tunfeng2,LI Shouping2,
WANG Chuan2,ZHANG Wen2
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(1.School of Mechanical Engineering, Shanghai Jiaotong University, Shanghai 200240, China;2.Nuclear Power Qinshan Joint Venture Company Limited, Zhejiang Haiyan 314300, China)
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Abstract The principle of tomographic gamma scanning (TGS) method for nondestructive assay of heterogeneous radioactive waste was described. An experiment of a 200 liter drum detection was conducted using the radioisotope 152Eu as the transmission source. A polar voxel representation was used, and the efficiency matrix was calculated by MCNP codes. The algebraic reconstruction technique and maximum likelihood expectationmaximization method were adopted for transmission and emission reconstruction to get the distribution of linear attenuation coefficient and radioactivity, respectively. The TGS results are obviously better than segmented gamma scanning (SGS) results, fitting the real activity very well with a relative error less than 10%. The results indicate that the polar voxel representation and reconstruction algorithms are feasible.
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Received: 27 November 2009
Published: 28 September 2010
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