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

溶融$$^{100}$$MoO$$_{3}$$試料からの繰り返しミルキング試験における高い$$^{99m}$$Tcの熱分離効率

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

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.

使用言語

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English

掲載資料名

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Journal of the Physical Society of Japan

巻

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83

号

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8

ページ数

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p.083201_1 - 083201_4

発行年月

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2014/07

発表会議名

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開催年月

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開催都市

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開催国

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キーワード

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Medical Radioisotope; Diagnostic Imaging; Milking; Thermo-separation; RI production; Accelerator Neutrons; Neutron Induced Reaction; $$^{100}$$Mo(n,2n)$$^{99}$$Mo

特許データ

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PDF

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論文URL

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https://doi.org/10.7566/JPSJ.83.083201

研究データの公開先DOI

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使用施設

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FNS(核融合炉物理用中性子源施設);RI製造棟  

広報プレスリリース

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論文解説記事
(成果普及情報誌)

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受委託・共同研究相手機関

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Access

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- Accesses

InCites™

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パーセンタイル：57.84

分野：Physics, Multidisciplinary

Altmetrics

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