A new method of pure In-III production by proton-induced nuclear reactions with enriched Sn-112

作者：Betak Emil^*; Rurarz Edward; Mikolajewski Stefan; Wojtkowska Jolanta

来源：Nukleonika, 2007, 52(1): 17-27.

• cross sections
• Sn isotopes
• proton-induced reactions
• In-111 production
• diagnostic radioisotope

We aimed at finding out a simple and reliable way of In-111 production with the highest radionuclide purity from its grand parent Sb-111 and parent Sn-111 nuclei, produced by the Sn-112(p,2n)Sb-111 and Sn-112(p,pn)Sn-111 reactions, respectively. The target was a metallic Sn-112 sample enriched to 84%. We have measured activation cross sections for seven reactions on an enriched Sn-112 sample induced by 23.6 +/- 0.8 MeV energy protons. Gamma-ray spectroscopy with high-purity germanium detectors has been used. We also identified the activities of Co-55 (T-1/2 = 17.5 h) and Cu-60 (T-1/2 = 23.7 min) in proton beam monitoring Ni foils, induced in the Ni-nat(p,X)(55) Co and Ni-nat(p,X)Cu-60 reactions at 22.8 MeV proton energy. The cross sections determined for these reactions are: sigma[Ni-nat(p,X)Co-55] = 36.6 +/- 4 mb and sigma[Ni-nat(p,X)Cu-60] = 64.4 +/- 7 mb. The measured cross sections of reactions on tin isotopes are: sigma[Sn-112(p,n)Sb-112] = 4 +/- 0.8 mb; sigma[Sn-112(p,2n)Sb-111] = 182 +/- 26 mb; sigma[Sn-112(p,pn)Sn-111] = 307 +/- 35 mb; sigma[Sn-114(p,2n)Sb-113] = 442 +/- 52 mb; sigma[Sn-117(p,n)Sb-117] = 15 +/- 3 mb; sigma[Sn-117(p,p'gamma)Sn-117m] = 0.37 +/- 0.06 mb; sigma[Sn-115(p,2p)In-114m2] = 0.01 +/- 0.002 mb. Our measurements indicated the expected yield of the In-111 production to be 46 MBq/mu Ah (1.2 mCi/mu Ah). The contamination of In-111 by the undesired nuclide In-114m2 was determined and belongs to the smallest ones found in the literature. The measured cross sections were compared with theoretical calculations by two top-level nuclear reaction codes EMPIRE and TALYS.

• 出版日期2007