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Development of inorganic ion exchangers for separation of $$^{99}$$Mo/$$^{rm 99m}$$Tc

$$^{99}$$Mo/$$^{rm 99m}$$Tc分離のための無機イオン交換体開発

Hu, X.; 鈴木 達也*; Wang, X.*; Wang, H.*; 藤田 善貴   ; 土谷 邦彦 

Hu, X.; Suzuki, Tatsuya*; Wang, X.*; Wang, H.*; Fujita, Yoshitaka; Tsuchiya, Kunihiko

テクネチウム-99m ($$^{rm 99m}$$Tc)は核医学画像診断に最も広く使用されている放射性核種であり、モリブデン-99 ($$^{99}$$Mo)の放射性崩壊から生成される。本研究は、カラムクロマトグラフィーによる$$^{rm 99m}$$Tcと$$^{99}$$Moの分離への応用を目的として、SnCl$$_{4}$$にSbCl$$_{5}$$, WO$$_{2}$$Cl$$_{2}$$, WO$$_{3}$$, TiCl$$_{4}$$を1:1で組合せて合成した4つの無機イオン交換体の$$^{99}$$Moと$$^{rm 99m}$$TcのKd(分配係数)値を比較および評価した。Tcの代替元素としてReを使用し、Mo濃度およびRe濃度をそれぞれ4ppmに調製したpH2から12の溶液中でバッチ試験による吸着実験を実施した。その結果、4つすべてのイオン交換体で良好な選択性と比較的高いKd値を示し、SnCl$$_{4}$$-TiCl$$_{4}$$が最も高いKd値を示すことを明らかにした。

Technetium-99m ($$^{rm 99m}$$Tc) stands as the most widely employed radionuclide for nuclear medicine diagnostic imaging procedures. $$^{99m}$$Tc originates from the radioactive decay of molybdenum-99 ($$^{99}$$Mo). In present study, four inorganic ion exchangers were synthesized by combining SnCl$$_{4}$$ with SbCl$$_{5}$$, WO$$_{2}$$Cl$$_{2}$$, WO$$_{3}$$, and TiCl$$_{4}$$ in a one-to-one for application to the separation of $$^{rm 99m}$$Tc and $$^{99}$$Mo by column chromatography approach. We conducted comparing and evaluating their respective Kd (distribution coefficient) values. We utilized these synthesized inorganic ion exchangers for adsorption in a solution with a prepared concentration of 4 ppm of Mo/Re, where Re acted as a surrogate element to simulate Tc. Various pH environments ranging from 2 to 12 were prepared. Subsequently, we conducted adsorption experiments using batch testing and determined the Kd values. The results revealed that all four ion exchangers exhibit commendable selectivity and relatively high Kd values, with SnCl$$_{4}$$-TiCl$$_{4}$$ demonstrating the highest Kd.

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