Description: Determination of the reaction products of solar neutrinos with /sup 98/Mo and /sup 97/Mo to produce /approximately/10/sup 8/ atoms of /sup 98/Tc and /sup 97/Tc in 10/sup 4/ tons of ore for the last several million years have prompted the development of highly sensitive isotopic analytical technique for technetium. Secular equilibrium /sup 99/Tc, present in the ore at 10/sup 8/ to 10/sup 9/ atom levels will be used for an internal tracer to fix absolute atom amounts. Previous work has suggested that negative thermal ionization can produce high ionization efficiency for certain selected elements, including technetium. Negative thermal ionization has several advantages over the positive ion approach. Technetium forms the pertechnetate ion while the most common and abundant isobaric impurity, molybdenum, forms MoO/sub 3//sup /minus//. In addition, technetium forms negative ions very efficiently; efficiencies of >2% have been measured. Positive ion techniques are much less efficient. Organic impurities also are much less troublesome in the negative ionization mode. 6 refs.
Date: January 1, 1988
Creator: Rokop, D.J.; Schroeder, N.C. & Wolfsberg, K.
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