Chemical behavior of technetium atoms recoil-implanted in metal acetylacetonates.
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概要
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New compounds of technetium acetylacetonates synthesized by nuclear recoil technique in our laboratory have been further studied to clarify their formation characteristics. Technetium atoms were implanted in various metal acetylacetonates using <SUP>100</SUP>Ru(γ, p)<SUP>99m</SUP> Tc reaction and nuclear fission of <SUP>235</SUP>U. The yield of Tc(acac)3 decreased with increase of the force constant of metal-oxygen bond of the catcher system M (III) (acac)<SUB>3</SUB>. No such relationship could be observed for the yield of Tc (acac)<SUB>3</SUB> in the catcher system M (II) (acac)<SUB>3</SUB>. <BR>An oxygen effect was examined in fission recoil implantation in Cr (acac)<SUB>3</SUB> or Co (acac)<SUB>3</SUB>. Formation of <SUP>99m</SUP>TcO<SUB>2</SUB>(acac)<SUB>2</SUB> was observed by irradiation in air while it was not observed by irradiation in vacuo. These experimental results indicated the presence of its precursor <SUP>99</SUP>MoO<SUB>2</SUB>(acac)<SUB>2</SUB> which was most probably formed by chemical reactions among Mo atom (excited by β-decay), acetylacetone ligands and oxygen. This example showed the applicability of the "daughter tracer technique" to the <SUP>99</SUP>Mo-<SUP>99m</SUP> Tc system.
- 一般社団法人 日本原子力学会の論文
著者
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Sekine Tsutomu
Department Of Chemistry Graduate School Of Science Tohoku University
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YOSHIHARA KENJI
Department of Cbemistry, Faculty of Science, Toboke University,
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