Ngo Minh Chu, Fujita Yoshitaka, Suzuki Tatsuya, Dung Do Thi Mai, Seki Misaki, Nakayama Tadachika, Niihara Koichi, Suematsu Hisayuki
Extreme Energy-Density Research Institute, Nagaoka University of Technology, Nagaoka, Niigata 940-2188, Japan.
Multi-Material Research Institute, National Institute of Advanced Industrial Science and Technology (AIST), Nagoya, Aichi 463-8560, Japan.
Inorg Chem. 2023 Aug 14;62(32):13140-13147. doi: 10.1021/acs.inorgchem.3c02125. Epub 2023 Aug 1.
β-MoO whiskers prepared by a thermal evaporation method and α-MoO particles were irradiated in a nuclear reactor to produce Mo/Tc radioisotopes via neutron capture. The irradiated targets were then dispersed in water to extract the Mo/Tc isotopes. Of the Mo formed in the β-MoO whiskers, 64.0 ± 7.4% was extracted with water; by contrast, only 8.8 ± 2.6% of the Mo formed in α-MoO was extracted. By comparing these data to the Mo concentration dissolved in water, we confirmed the hot-atom effect on both β-MoO whisker and α-MoO particle targets to transfer Mo isotopes from irradiated samples to water. In addition, the β-MoO whiskers exhibited a prominent hot-atom effect to transfer a higher ratio of Mo isotopes into water. To the best of our knowledge, this research is the first demonstration of β-MoO being used as an irradiation target in the neutron capture method. On the basis of the results, β-MoO is considered a promising irradiation target for producing Mo/Tc by neutron capture and using water for the radioisotope extraction process in the future.
通过热蒸发法制备的β-MoO晶须和α-MoO颗粒在核反应堆中进行辐照，通过中子俘获产生Mo/Tc放射性同位素。然后将辐照后的靶材分散在水中以提取Mo/Tc同位素。在β-MoO晶须中形成的Mo，有64.0±7.4%被水提取；相比之下，在α-MoO中形成的Mo只有8.8±2.6%被提取。通过将这些数据与溶解在水中的Mo浓度进行比较，我们证实了热原子效应在β-MoO晶须和α-MoO颗粒靶材上都存在，即Mo同位素从辐照样品转移到水中。此外，β-MoO晶须表现出显著的热原子效应，能将更高比例的Mo同位素转移到水中。据我们所知，本研究首次证明了β-MoO在中子俘获法中用作辐照靶材。基于这些结果，β-MoO被认为是未来通过中子俘获生产Mo/Tc并用水进行放射性同位素提取过程的有前景的辐照靶材。
