Incident energy effect of the production yield of endohedral Xe-fullerene by ion implantation

Xe内包フラーレンの生成率のイオン注入エネルギー依存性

渡辺 智; 石岡 典子; 松橋 信平

Watanabe, Satoshi; Ishioka, Noriko; Matsuhashi, Shimpei

Endohedral fullerenes encapsulating a radioisotope within a fullerene cage have a possibility of being new radiopharmaceuticals. We have prepared endohedral Xe -fullerenes by ion implantation. Xenon-133 (T = 5.243 d) would be useful for cancer therapy because it emits 0.346-MeV rays. However, we could not obtain efficient production of endohedral Xe -fullerene. To achieve more efficient production, conditions of the ion implantation, especially incident energy, has to be studied. In the present paper, we describe incident energy effect on the production yield of endohedral Xe -fullerene. The results of this study show that the yields of endohedral Xe -fullerenes were found to increase with decreasing incident energy. The yields of the endohedral Xe -fullerenes should be more increased by decreasing incident energy.