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Nuclear Science User Facilities 98 X-ray Absorption Near Edge Spectroscopy and Extended X-ray Absorption Fine Structure Study of Technetium-99 Relevant to the Nuclear Fuel Cycle Silvia Jurisson University of Missouri jurissonsmissouri.edu The synchrotron radiation techniques found in x-ray absorption near-edge spectros- copy XANES and extended x-ray absorption fine-structure spectroscopy EXAFS are among the very few that provide oxidation-state and nearest-neighbor information about compounds and materials that do not crystallize suitably or are not avail- able in sufficient quantities for x-ray diffraction analysis XRD. Technetium-99 Tc-99 is an impor- tant radionuclide in the nuclear fuel cycle. It is a major fission by-product of both uranium U and plutonium Pu and serves a vital role in envi- ronmental remediation at nuclear sites such as the Department of Energys reactor near HanfordWashington. Project Description We proposed to perform XANES and EXAFS experiments at theAdvanced Photon Source APS atArgonne National Laboratory ANL to determine the end products of immobilization reactions between pertechnetate TcO4 and sulfide in the presence of various olefinic acids.The results will allow us to determine the oxidation states of technetium Tc as well as those of its nearest neighbors in theTc metal center i.e. its coordination environment.The resulting data will provide mechanistic Figure 1. Tc K-edge EXAFS spectra of the standard complexes and experiment samples.