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論文

High thermo-separation efficiency of $$^{99m}$$Tc from molten $$^{100}$$MoO$$_{3}$$ samples by repeated milking tests

永井 泰樹; 川端 方子; 佐藤 望; 橋本 和幸; 佐伯 秀也; 本石 章司*

Journal of the Physical Society of Japan, 83(8), p.083201_1 - 083201_4, 2014/07

 被引用回数:10 パーセンタイル:62.33(Physics, Multidisciplinary)

High thermo-separation efficiencies of about 90% and 70% have been obtained for the first time for $$^{rm 99m}$$Tc from molten MoO$$_{3}$$ samples containing $$^{99}$$Mo with thicknesses of 4.0 and 8.8 mm, respectively, by repeated milking tests. $$^{99}$$Mo was produced with $$^{100}$$Mo($$n$$,2$$n$$)$$^{99}$$Mo by using neutrons from $$^{3}$$H($$d$$,$$n$$)$$^{4}$$He. The thermo-separation efficiency was determined by measuring the 141 keV $$gamma$$-ray yield of $$^{rm 99m}$$Tc within the molten MoO$$_{3}$$ samples with a radiation detector as a function of the furnace temperature and time. The diffusion coefficients of $$^{rm 99m}$$Tc in the molten MoO$$_{3}$$ samples were estimated in order to help understand the $$^{rm 99m}$$Tc release mechanism. The present result solves a long-standing problem of decreasing the separation efficiency of $$^{rm 99m}$$Tc from MoO$$_{3}$$ while increasing the sample mass or repeating sublimation in thermo-separation, and will bring a major breakthrough to obtain high-quality $$^{rm 99m}$$Tc from MoO$$_{3}$$ irradiated by accelerator-neutrons (protons) or reactor-neutrons.

論文

A Study on milking $$^{1}$$$$^{3}$$$$^{2}$$I from $$^{1}$$$$^{3}$$$$^{2}$$Te by sublimation

棚瀬 正和; 本島 健次

Int.J.Appl.Radiat.Isot., 28(7), p.641 - 643, 1977/07

 被引用回数:0

?$$^{3}$$$$^{2}$$Teから?$$^{3}$$$$^{2}$$Iを高収率、高純度でミルキングする簡単な方法が、検討された。$$^{1}$$$$^{3}$$$$^{2}$$IはHe-H$$_{2}$$(H$$_{2}$$~10vol%)ガス中で550$$^{circ}$$CでCu粒子に吸着した$$^{1}$$$$^{3}$$$$^{2}$$Te-$$^{1}$$$$^{3}$$$$^{2}$$Iから90%以上の収率で分離された。得られた$$^{1}$$$$^{3}$$$$^{2}$$I製品は99.9%以上の純度である。この操作は$$^{1}$$$$^{3}$$$$^{2}$$Iのジェネレーターとして何度でも困難なく、くりかえすことができる。

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