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Some production aspects of the Auger electron emitter  193m Pt ( T  1/2 =4.33 d) through the   192 Os(α,ߙ3 n )-process were investigated. Relatively thick targets of 99.65% enriched   192 Os, prepared by pressing or electrolytic deposition, were irradiated with 40 MeV α-particles for 3 h at a nominal beam current of 1.6 μA. The radioplatinum formed was chemically separated with a yield of 90% and the expensive target material was recovered with a yield of 85%. The radioactivity of  193m Pt was determined by high resolution X-ray spectrometry. The radionuclidic purity of  193m Pt amounted to 99%, the level of  195m Pt and   191 Pt impurities being each 0.5%. The batch yield of  193m Pt achieved was about 10 MBq with a specific activity of 1 GBq/μg Pt. Both the batch yield and the specific activity could be appreciably increased through improved targetry. A comparison of the cyclotron and reactor production routes of  193m Pt shows that the ( n ,ߙγ) reaction leads to high production yields but the α-particle induced reaction results in a product of higher radionuclidic purity and four orders of magnitude higher specific activity of  193m Pt.

Small scale production of high purity 193m Pt by the 192 Os(α,ߙ3 n )-process