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Please use this identifier to cite or link to this item: http://apo.ansto.gov.au/dspace/handle/10238/854

Title: Evaluation of neutron activation analysis for the measurement of isotopic abundances in molybdenum-98 enriched molybdenum.
Authors: Hetherington, ELR
Issue Date: Mar-1987
Publisher: Australian Nuclear Science and Technology Organisation
Abstract: Molybdenum enriched to approximately 50 per cent 98Mo is required for the development of a portable 99mTc generator based on the zirconium molybdate gel system developed by the AAEC. It has been proposed that existing AAEC facilities be used to enrich molybdenum and neutron activation analysis has been evaluated as a means of monitoring the enrichment process. Simulated enriched targets of MoO3 with 98Mo abundances ranging from 30 to 90 per cent were prepared by diluting 96.87 per cent enriched 98MoO3 with the natural trioxide. These targets were each irradiated simultaneously with a reference natural MoO3 target in a thermal neutron flux of 7.5 x 10 12 neutrons cm -2s -1 where the reactions 92 Mo(n,γ) 93Mo, 98Mo(n,γ) 99Mo and 100 Mo(n,γ) 101Mo- 101Tc occur. The isotopic abundances 98Mo and 100Mo were determined with an accuracy +- 2 percent by comparing the yields of 99Mo- 99mTc and 101Mo- 101Tc respectively in the enriched and natural targets. The activation yield of 93Mo was too low for the determination of the 92Mo abundances.
URI: http://apo.ansto.gov.au/dspace/handle/10238/854
ISBN: 0642598479
Appears in Collections:Scientific and Technical Reports

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