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Isotope production for medical usage using fast neutron reactions

高速中性子を用いた医療用同位体製造

初川 雄一; 永井 泰樹; 金 政浩; 瀬川 麻里子; 原田 秀郎 ; 岩本 修; 岩本 信之; 落合 謙太郎; 高倉 耕祐; 今野 力; 橋本 雅史

Hatsukawa, Yuichi; Nagai, Yasuki; Kin, Tadahiro; Segawa, Mariko; Harada, Hideo; Iwamoto, Osamu; Iwamoto, Nobuyuki; Ochiai, Kentaro; Takakura, Kosuke; Konno, Chikara; Hashimoto, Masashi

核医学において最もよく用いられている$$^{99}$$Tcの供給は危機に面しており、新たな製造プロセスの開発は喫緊の問題である。本研究は$$^{rm 99m}$$TcをFNSより発生される14MeV高速中性子を用いて効率よく製造することを提案するものであり、試験的に作成したチタン酸ゲルを用いた$$^{rm 99m}$$Tc/$$^{99}$$Moジェネレータについても併せて発表を行う。

Authors proposed a new route to produce $$^{99}$$Mo by the $$^{100}$$Mo($$n$$,2$$n$$)$$^{99}$$Mo reaction, which has some characteristic features. Such as the reaction cross section is large, about 1.5 barn at 12 $$<$$ $$E$$$$_{rm n}$$ $$<$$ 17 MeV, which is 10 times larger than the thermal-neutron capture cross section of $$^{98}$$Mo. Second, the cross sections of the ($$n$$,$$alpha$$), ($$n$$,$$np$$), and ($$n$$,$$p$$) reactions are less than a few mb at $$E$$$$_{rm n}$$ = 14 MeV. Third, a large amount of $$^{100}$$Mo target materials can be used, compared to that for proton beam irradiation on $$^{100}$$Mo. Fourth, intense neutrons with energy of 12-17 MeV are already available. In the present work we have measured all $$gamma$$-rays emitted from activities produced by bombarding a natural Mo target with neutrons from the D($$^3$$H,$$n$$)$$^4$$He reaction at Fusion Neutronics Source Facility (FNS) at Japan Atomic Energy Agency (JAEA) to study characteristic features mentioned above more in detail. The neutron flux was about 10$$^{12}$$n/cm$$^2$$s. The experimental results at FNS will be discussed in the conference.

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