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Many useful and needed radionuclides for medicinal, astrophysical, and environmental research are produced naturally in inefficient quantities or not-at-all. In the method described here, rare cosmogenic isotopes were produced via spallation reactions in metallic vanadium and separated without adding any carriers. In the SINQ facility at the Paul Scherrer Institut, the vanadium targets were irradiated for two years with high-energy protons (≤590 MeV). After a cooling period of eight years, only relatively long-lived radionuclides such as  32 Si,  44 Ti,  41 Ca, and  26 Al remain present. After target dissolution,  32 Si was first separated for a prospective half-life redetermination. The remaining  32 Si-free solution was used for extracting  44 Ti,  41 Ca, and  26 Al, three key isotopes which are scientifically interesting for nuclear astrophysics research as well as medical applications. Each separation scheme employed ion-exchange and extraction chromatography; developed and optimized using inactive model solutions analyzed with Inductively Coupled Plasma–Optical Emission Spectrometry (ICP–OES). The irradiated samples were tracked with γ-ray spectroscopy for γ-ray emitting impurities. As a result, radiochemically pure sample solutions of  44 Ti,  41 Ca, and  26 Al were obtained as “ready for use” in different application fields.

Recovery of no-carrier-added 41 Ca, 44 Ti, and 26 Al from high-energy proton-irradiated vanadium targets