Reactor Irradiation Experiments by Advanced Optical Technology

我们开发了一种高分辨率的共振电离光谱系统，可用于检测亚ppd水平浓度的稳定或放射性同位素。该系统使用Xe气体和几种固体元素进行了测试。采用脉冲烧蚀激光对固体样品进行雾化。我们还测试了一个单一的激光系统，它可以用于烧蚀和电离。与传统的激活箔法相比，电流系统具有更好的灵敏度。对系统的敏感性进行了定量评价，并对实际系统的进一步问题进行了分析。激光诱导发射的分辨率为2mm，可以在中子场中进行在线测量。基于对辐射诱发现象快速检测的研究，研制了动态CT自动测量系统，并进行了脉冲电子束测试。切伦科夫光和闪烁都在sub - ns时间尺度下可视化。对光学器件进行了辐照实验。采用位置湮没测量技术研究了HCP结构中缺陷的形成机理。对观察到的簇大小及其稳定性进行了评价。与辐照实验结果比较，在评价中分离了扩散效应，明确了缺陷团簇形成机理。

We have developed a high resolution Resonance Ionization Spectroscopy system that can be used for the detection of stable or radioactive isotopes of sub ppd level concentration. The system was tested using Xe gas and several solid elements. Solid samples were atomized by the pulsed ablation laser. We have also tested a single laser system, which can be used for ablation and ionization. Current system showed a better sensitivity than conventional activation foil method. Quantitative evaluation of the system sensitivity and further issues for the practical system were performed.The resolution of laser induced emission was evaluated to be 2mm and online measurement in a neutron field is possible. On the study of very fast detection of radiation induced phenomena, a dynamic CT automatic measurement system was developed and tested with a pulsed electron beam. Both Cherenkov light and scintillation were visualized with sub ns time scale. Irradiation experiment on optics was also performed.Defect formation mechanism in the HCP structure was investigated by a position annihilation measurement technique. The cluster size observed for the cascade damage and its stability were evaluated. Compared with the results from on irradiation experiments, the diffusion effect was separated in the evaluation and the defect cluster formation mechanism was clarified.