Analytical calculation of the collimated detector response for the characterization of nuclear waste drums by segmented gamma scanning
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Improved methods for the reconstruction of the isotope specific activity content in nuclear waste drums with data obtained by a gamma scanning system developed at Shanghai Jiao Tong University require an analytical function of the detector response. In this work we derive an analytical detector response function for a collimated HPGe detector with a square collimation window. The model is based on a purely geometric model respecting the configuration of the collimated detector system, the positions of radioactive point sources and the absorption of γ-rays in the matrix as well as in the HPGe crystal. We show that the derived analytical detector response function is in good agreement with data simulated by MCNP5.
KeywordsNuclear waste Segmented gamma scanning Detector response
This work was supported by the National Natural Science Foundation of China (contract number: 10675084).