The properties of materials applied in fission and fusion reactors and targets of spallation neutron sources can be greatly degraded by radiation-induced transmutants. A precise prediction of the production of transmutants is highly important for the safety assessment of these facilities. The prediction is normally made using neutronic calculations. Experimental validation of the calculation results is essentially necessary, but usually very challenging. In the present work, a quantitative analysis of transmutants in ferritic-martensitic (FM) steels F82H, Eurofer 97, and ODS Eurofer after irradiation at 9.6 and 19.6–21 dpa in the SINQ targets was performed using Atom Probe Tomography (APT). The results indicate that solid transmutants Ti, Sc, Ca, K, Cl, and S can be precisely measured and a gas element Ar could also be detected. The difference between the measured concentrations and that calculated with the MCNPX code is less than 30% for most of detectable nuclides of the transmutants. This work demonstrates that the neutronic calculations applied to STIP irradiation experiments are reliable.

裂变和聚变反应堆中应用的材料和散裂中子源靶材的性能会因辐射诱发的嬗变体而大大降低。对这些设施的安全评估而言，精确预测转化体的产生是非常重要的。通常使用中子计算进行预测。计算结果的实验​​验证本质上是必要的，但通常非常具有挑战性。在目前的工作中，使用原子探针断层扫描 (APT) 对 SINQ 目标中的铁素体-马氏体 (FM) 钢 F82H、Eurofer 97 和 ODS Eurofer 在 9.6 和 19.6-21 dpa 辐照后的嬗变体进行了定量分析。结果表明，可以精确测量固体嬗变体 Ti、Sc、Ca、K、Cl 和 S，还可以检测到气体元素 Ar。对于大多数可检测的转化体核素，测量浓度与使用 MCNPX 代码计算的浓度之间的差异小于 30%。这项工作表明应用于 STIP 辐照实验的中子计算是可靠的。