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

Nagai, Yasuki; Kawabata, Masako; Sato, Nozomi; Hashimoto, Kazuyuki; Saeki, Hideya; Motoishi, Shoji*

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.

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Category:Physics, Multidisciplinary

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