Excitation functions and yields for cyclotron production of radiorhenium via deuteron irradiation: ~(nat)W(d,xn)~*181,182(A+B),183,184(m+g),186g)Re nuclear reactions and tests on the production of ~(186g)Re using enriched ~(186)W

摘要

Excitation functions, thin- and thick-target yields for the 181-~(186g)Re and 187Wradionuclidesweremeasured by the activation stacked-foil thecnique on natural tungsten foils for deuteron energies up to 18.0MeV. These cross sections were validated by comparing the experimental results for thick-target yields with those calculated by integration of the thin-target yields. It was found that themaximum~(186g)Re content by irradiation of natural tungsten is about 55%, a higher value compared with the one found for proton beam, but not sufficient to use natural tungsten for medical purposes yet. Thus, in order to have a higher specific activity A_S of ~(186g)Re, the use of enriched ~(186)W target is necessary. Therefore the irradiation of a thick target of enriched 186Wby accelerated deuterons was studied and the results for the production of ~(186g)Re were compared with those obtained from the irradiation of the same target by accelerated protons. It was found that the deuteron irradiation is preferable for three reasons: larger yield, less contamination by tantalumradioisotopes and smaller required amount of the target, which simplify the separation of the ~(186g)Re from the target itself.