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Excitation functions and thin-target yields for the  181-186g Re radionuclides have been measured by the stacked-foil activation technique on tungsten foils of natural isotopic composition for different proton energies up to 22.0 MeV. A further check on the cross sections was done by irradiation of thick-targets and comparing the irradiated thick-target yields with those calculated by analytical integration from the thin-target yields. The production of  186g Re was also studied by the irradiation of thick-target of enriched   186 W with a 13.6±0.2 MeV proton beam. The results for   186 W( p ,ߙ n ) 186g Re were compared also to those calculated by the EMPIRE II code (version 2.19), due to  186g Re extensive applications in nuclear medicine for metabolic radiotherapy of tumours. It was found that the maximum percentage of  186g Re by irradiation of natural tungsten is about 20% only, which confirms the conclusion that high radionuclidic purity and specific activity of  186g Re necessitate the use of highly enriched   186 W target.

radiochimica acta

Excitation functions and yields for cyclotron production of radiorhenium  via  nat  W( p ,ߙ xn ) 181-186g Re nuclear reactions and tests on the production of  186g Re using enriched  186 W