47Sc and 46Sc cross-section measurement for an optimized 47Sc production with an 18 MeV medical PET cyclotron

• Published in: Applied radiation and isotopes 2022-11, Vol.189, p.110428-110428, Article 110428
• Main Authors: Dellepiane, Gaia, Casolaro, Pierluigi, Mateu, Isidre, Scampoli, Paola, Voeten, Naomi, Braccini, Saverio
• Format: Article
• Language: English
• Subjects: Cross sections; Medical cyclotron; Proton irradiation; Scandium-47; Solid targets; Theranostics
• ISSN: 0969-8043; 1872-9800
• DOI: 10.1016/j.apradiso.2022.110428

The availability of novel radionuclides plays a fundamental role in the development of personalized nuclear medicine. In particular, there is growing interest in pairs formed by two radioisotopes of the same element, the so-called true theranostic pairs, such as 61,64Cu/67Cu, 43,44Sc/47Sc and 155Tb/149,161Tb. In this case, the two radionuclides have identical kinetics and chemical reactivity, allowing to predict whether the patient will benefit from a therapeutic treatment on the basis of nuclear imaging data. 47Sc [t1/2 = 3.349 d, Eβ−max = 440.9 keV (68.4%); 600.3 keV (31.6%), Eγ = 159.4 keV (68.3%)] is a promising radionuclide for theranostic applications in nuclear medicine. Its physical characteristics make it suitable for radionuclide therapy and allow SPECT imaging during treatment. Moreover, 47Sc is foreseen as the therapeutic partner of the β+-emitters 43Sc and 44Sc, both under study for PET imaging, opening new avenues towards the true theranostics concept. 47Sc can be produced by proton irradiation of an enriched 50Ti oxide target with a medical cyclotron equipped with a solid target station. To optimize the production yield and the radionuclidic purity, an accurate knowledge of the production cross sections is necessary. In this paper, we report on measurements of the production cross section of 47Sc and 46Sc using enriched 50Ti titanium oxide targets, performed at the Bern University Hospital cyclotron laboratory. On the basis of the obtained results, a study of the production yield and purity was performed to assess the optimal irradiation conditions. A production test was also carried out to confirm these findings. •Measurement of Sc radioisotope cross sections by irradiating 50Ti.•Measurements performed using an 18 MeV medical cyclotron and a beam transfer line.•Study of the thick target production yield and purity.•A production test was performed using a custom target station.•An 18 MeV cyclotron is suitable to produce 47Sc for RNT in nuclear medicine.