Field Kevin G, Massey Caleb P, Smith Kurt R, Briggs Samuel A, Zhang Dalong, Littrell Kenneth C
Nuclear Engineering and Radiological Sciences University of Michigan-Ann Arbor 2301 Bonisteel Boulevard Ann Arbor MI48109 USA.
Oak Ridge National Laboratory Oak Ridge TN37831 USA.
J Appl Crystallogr. 2025 May 31;58(Pt 3):1000-1014. doi: 10.1107/S1600576725003176. eCollection 2025 Jun 1.
The development of a Pb-shielded fixture for the execution of a small-angle neutron scattering (SANS)-based workflow for interrogation of highly irradiated nuclear materials has been explored. The Pb shielding was specially designed to reduce the detected radioactivity from the specimen during SANS experiments, and the overall configuration is termed shielded magnetic SANS (SM-SANS). Two FeCrAl-based alloys, C35M and 125YF, were examined with the SM-SANS technique using a free-form size distribution locally monodisperse model in both the as-received and irradiated states. Quantitative values derived from the free-form size distribution were compared with atom probe tomography experiments. Microstructural and compositional parameters determined using the two characterization techniques were complements of each other. The results demonstrate that the SM-SANS technique is an effective means of characterizing nanoscale clustering in irradiated material systems and provides new avenues for investigating radioactive material microstructures.
已经探索了一种用于执行基于小角中子散射（SANS）的工作流程以检测高辐照核材料的铅屏蔽装置的开发。铅屏蔽专门设计用于在SANS实验期间减少来自样品的检测到的放射性，并且整体配置被称为屏蔽磁SANS（SM-SANS）。使用自由形式尺寸分布局部单分散模型，通过SM-SANS技术在原样和辐照状态下对两种FeCrAl基合金C35M和125YF进行了检查。将从自由形式尺寸分布得出的定量值与原子探针断层扫描实验进行了比较。使用这两种表征技术确定的微观结构和成分参数相互补充。结果表明，SM-SANS技术是表征辐照材料系统中纳米级团聚的有效手段，并为研究放射性材料微观结构提供了新途径。
