Estimation of systematic error of the gamma tomography for correction of self-attenuation in assay of radioactive waste

Abstract

Based on simulating measurement system to assay radioactive waste drums a model for estimation of the lump effect, especially for plutonium, in the tomography technique is given. The calculation results demonstrated that the tomography technique can successfully be used for measuring the heterogeneous waste drums containing lumps. In the cases considered, the dimensions of a pixel are chosen equal to 1cm the errors for the lump of plutonium metal are about 25 %. Some results for the various shapes of lump are given.