Analytical calculation of the collimated detector response for the characterization of nuclear waste drums by segmented gamma scanning
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- Qian, N., Krings, T., Mauerhofer, E. et al. J Radioanal Nucl Chem (2012) 292: 1325. doi:10.1007/s10967-011-1601-1
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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.