The roles of ^99gTc in stars and in nuclear fission reactors and that of ^99mTc in nuclear medicine that were studied using neutrons provided from accelerators are reported. In addition to the critical role of ^99gTc in stars, we also describe the roles of related light nuclei such as ¹⁶O, and experimental studies on keV-neutron capture cross sections of these light nuclei that were performed using keV neutrons provided from a 3.2-MV Pelletron accelerator are reported. The keV-neutron capture cross section of ^99gTc, that is important in studies on the nucleosynthesis of ⁹⁹Tc in stars and on the nuclear transmutation of long-lived nuclear wastes produced in fission reactors, were measured. The cross sections of both light nuclei and ^99gTc were measured using a neutron time-of-flight method with a ns-pulsed neutron source from the ⁷Li(p,n)⁷Be reaction and with an anti-Compton γ-ray NaI(Tl) spectrometer. The measurements reported here were compared with the values of recent worldwide evaluated nuclear data libraries.

We proposed a method of producing ^99mTc from the ¹⁰⁰Mo(n,2n)⁹⁹Mo reaction, and performed a ^99mTc production experiment using a ^natMo sample and MeV neutrons from the ^natC(d,n) reaction by 40 MeV deuterons at a cyclotron. Calculations for the ^99mTc production with an enriched ¹⁰⁰Mo sample were also performed, and calculated results were compared with the experimental results. Moreover, the thermoseparation of ^99mTc from ⁹⁹Mo was discussed. As a result, it was shown that ^99mTc prepared by the thermoseparation using ⁹⁹Mo produced by the ¹⁰⁰Mo(n,2n)⁹⁹Mo reaction can be a promising substitute for the fission product ⁹⁹Mo.

报道了^99g Tc 在恒星和核裂变反应堆中的作用以及^99m Tc 在核医学中的作用，这些研究使用加速器提供的中子进行了研究。除了^99g Tc 在恒星中的关键作用外，我们还描述了¹⁶ O 等相关轻核的作用，以及使用 3.2 提供的 keV 中子对这些轻核的 keV 中子捕获截面进行的实验研究-MV Pelletron 加速器被报道。^99g Tc的keV-中子俘获截面，对⁹⁹的核合成研究具有重要意义测量了恒星中的 Tc 和裂变反应堆中产生的长寿命核废料的核嬗变。使用中子飞行时间法测量轻核和^{99g Tc 的横截面，使用来自7} Li( p , n ) ⁷ Be 反应的 ns 脉冲中子源和反康普顿 γ -射线 NaI (Tl) 光谱仪。将此处报告的测量值与最近全球评估的核数据库的值进行了比较。

我们提出了从¹⁰⁰ Mo( n ,2 n ) ⁹⁹ Mo 反应生产^{99m Tc 的方法，并使用天然}Mo 样品和来自^天然C( d , n ) 反应的 MeV 中子在 40 MeV 下进行了^99m Tc 生产实验回旋加速器中的氘核。^{还对富集100} Mo 样品的^99m Tc 产量进行了计算，并将计算结果与实验结果进行了比较。此外，讨论了从⁹⁹ Mo热分离^99m Tc 。结果表明^利用100 Mo( n ,2 n ) ⁹⁹ Mo 反应产生的^{99 Mo 热分离制备的99m} Tc有望替代裂变产物⁹⁹ Mo。