99Tc in stars, reactors, and nuclear medicine
99Tc in stars, reactors, and nuclear medicine
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99Tc 在恒星、反应堆和核医学中的应用
DOI：
10.1140/epja/s10050-022-00883-8
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发表时间：
2022
期刊：
影响因子：
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通讯作者：
Igashira Masayuki
中科院分区：
文献类型：
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作者：
Nagai Yasuki;Igashira Masayuki
本文报道了99gtc在恒星和核裂变反应堆中的作用，以及99mtc在核医学中的作用。除了99gtc在恒星中的关键作用外，我们还描述了相关轻核（如16o）的作用，并报道了使用3.2 mv Pelletron加速器提供的keV中子对这些轻核的kv -中子捕获截面的实验研究。测量了99gtc的k -中子俘获截面，该截面在研究99gtc在恒星中的核合成和裂变反应堆中产生的长寿命核废料的核嬗变中具有重要意义。用来自7li (p,n)7Be反应的ns脉冲中子源和反康普顿γ射线NaI（Tl）谱仪，用中子飞行时间法测量了轻核和99gtc的截面。这里报告的测量值与最近世界范围内评估的核数据库的值进行了比较。我们提出了一种由100mo (n,2n)99Mo反应生成99mtc的方法，并利用atmo样品和来自atc （d,n）反应的40 MeV氘核在回旋加速器上进行了99mtc生成实验。对富集100mo样品99mtc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，还讨论了99mtc与99mo的热分离。结果表明，利用100mo (n,2n)99Mo反应产生的99Mo进行热分离制备的99mtc可以很好地替代裂变产物99Mo。
The roles of99gTc in stars and in nuclear fission reactors and that of99mTc in nuclear medicine that were studied using neutrons provided from accelerators are reported. In addition to the critical role of99gTc in stars, we also describe the roles of related light nuclei such as16O, 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 of99gTc, that is important in studies on the nucleosynthesis of99Tc 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 and99gTc were measured using a neutron time-of-flight method with a ns-pulsed neutron source from the7Li(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 producing99mTc from the100Mo(n,2n)99Mo reaction, and performed a99mTc production experiment using anatMo sample and MeV neutrons from thenatC(d,n) reaction by 40 MeV deuterons at a cyclotron. Calculations for the99mTc production with an enriched100Mo sample were also performed, and calculated results were compared with the experimental results. Moreover, the thermoseparation of99mTc from99Mo was discussed. As a result, it was shown that99mTc prepared by the thermoseparation using99Mo produced by the100Mo(n,2n)99Mo reaction can be a promising substitute for the fission product99Mo.