Management of problematic tetravalent fission products and actinides present in the back end of the nuclear fuel cycle presents important scientific and technical challenges concerning the reprocessing and disposal of used ...

99Technetium poses a difficult problem at multiple Department of Energy sites, where there are currently vast quantities in storage. 99Tc has a half-life of 2.3 x 105 years, thus it will have to be accounted for a very ...