PNNL

Abstract

Gamma detection of select fission products or activation products such 153Sm and 239Np in a fission sample is difficult due to gamma interferences from radiotellurium and radioiodine. To aid in the detection of these difficult to detect nuclides, the radiotellurium and radioiodine was removed using Cu metal turnings. This method is highly effective at the removal of the interfering radionuclides removing >98% of the radiotellurium and radioiodine. A mechanistic study was conducted, determining the deposition mechanism, exploring using a number of techniques including XANES and electrochemistry providing an understanding of the electrochemical path for the Te deposition. Initial work focused on the use of stable Te, further expanding into activated TeO2, and a fresh fission sample. This method presents a rapid method for the direct detection of select fission products that could have a significant impact on nuclear related fields including nuclear forensics.