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| Analysis on Reconstruction Technique Using Dynamic Grids in Tomographic Gamma Scanning Method for Radioactive Waste Drum |
| GU Wei-Guo, WANG De-Zhong, LIU Cheng, QIAN Nan |
| (School of Mechanical Engineering, Shanghai Jiaotong University, Shanghai 200240, China) |
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Abstract A new image reconstruction algorithm employing dynamic grids technique was proposed for tomographic gamma scanning (TGS). The process of detection was simulated aiming at the single-point and multi-point sources in the matrix with three different densities. The results of the transmission reconstruction and emission reconstruction exhibit that the emission reconstruction error and grids number by using dynamic grids is less than that by using fixed grids in most cases respectively. Moreover, with the increase of the source position radius or the matrix density, the emission reconstruction error of fixed grids will increase, but the error still maintains the low level if dynamic grids are applied. It is indicated that the high detection accuracy is obtained for the full segment of radioactive waste drum filled with high density matrix if dynamic grids are used in TGS emission reconstruction.
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Received: 26 September 2012
Published: 28 April 2013
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