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Excitation functions, thin- and thick-target yields for the  181−186g Re and  187 W radionuclides were measured by the activation stacked-foil thecnique on natural tungsten foils for deuteron energies up to 18.0 MeV. 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 the maximum  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  186 W by 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 tantalum radioisotopes and smaller required amount of the target, which simplify the separation of the  186g Re from the target itself.

radiochimica acta

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