XRF APPLICATION FOR DIFFUSION STUDIES IN RADIOACTIVE WASTE CEMENTED MATRIX

摘要

The aim of this work is the XRF application for the qualitative identification and relative concentrations determination of the elements Co, Sr, Cs and La on matrix that simulates the conditioned radioactive waste. The first three elements are the chemical carrier of some importants radio-nuclides in the radioactive waste management. La was introduced to replace Eu which partially simulates the chemical behaviour of Am. For the spectral analysis of the samples a X-rays, Si-detector was used, due to the fact that it has better efficiency and resolution compared to a Ge-detector. In order to obtain the fluorescence spectrum a Am~(241) inelar source (A = 20 mCi), was used. The selected matrices for the study are normal cement and concrete compositions with and without mineral additives (bentonite and volcanic tuff). The results obtained by this analysis give useful information about the XRF application on the diffusion depth and concentrations profiles for each element.