Reactor Irradiation Experiments by Advanced Optical Technology

先进光学技术的反应堆辐照实验

• 批准号: 07308037
• 负责人: NAKAZAWA Masaharu
• 金额: $ 7.49万
• 依托单位: University of Tokyo
• 依托单位国家: 日本
• 项目类别: Grant-in-Aid for Scientific Research (A)
• 财政年份: 1995
• 资助国家: 日本
• 起止时间: 1995 至 1997
• 项目状态: 已结题
• 来源: https://kaken.nii.ac.jp/grant/KAKENHI-PROJECT-07308037/
• 关键词: optical technique; nuclear reactor; irradiation experiment; Resonance lonization Spectroscopy; RIS; radiation induced emission, pulsed laser; radiation damage; fast neutron science; レーザー共鳴イオン化分光; 極短パルスレーザー; 原子炉照射; 中性子; 照射損傷; カスケード損傷; 中性子科学

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.

我们研制了一套高分辨率共振电离光谱系统，可用于亚ppd水平的稳定或放射性同位素的检测。用Xe气体和几种固体元素对该系统进行了测试。固体样品用脉冲烧蚀激光雾化。我们还测试了一个可用于烧蚀和电离的单一激光系统。与传统的活化箔方法相比，电流体系具有更高的灵敏度。对系统的灵敏度进行了定量评估，并对实际系统中存在的问题进行了讨论。激光诱导发射的分辨率为2 mm，可以在中子场中进行在线测量。为了研究辐射诱发现象的快速检测，研制了一套动态CT自动测量系统，并用脉冲电子束对其进行了测试。切伦科夫光和闪烁均以亚纳秒时间尺度显示。还进行了光学辐照实验，用位置湮没测量技术研究了hcp结构中缺陷的形成机理。对观察到的叶栅损伤团簇大小及其稳定性进行了评估。与辐照实验结果相比较，在评价中分离了扩散效应，阐明了缺陷团簇的形成机理。

项目成果

N.Sekimura,Y.Shirao,H.Yamaguchi et al: "Defect Cluster Formation in Vanadium Irradiated with Heavy Ions" to be published in Journal of Nuclear Materials. (1998)

N.Sekimura、Y.Shirao、H.Yamaguchi 等人：“Defect Cluster Formation in Vanadium Irradiated with Heavy Ions”即将发表在 Journal of Nuclear Materials 上。

M.Uesaka,T.Ueda et al: "Generation,Measurement and Application of Synchronized 700fs Electron,100fs T3 Laser and Picoseconds X-ray Single Pulse" AIP Conf.Proc.398. 687-692 (1997)

M.Uesaka、T.Ueda 等人：“同步 700fs 电子、100fs T3 激光和皮秒 X 射线单脉冲的生成、测量和应用”AIP Conf.Proc.398。

M.Uesaka, T.Watanabe et al: "Production and Utilizaition of Synchronized Femtosecond Electron and Laser Single Pulses" Journal of Nuclear Materials. 248. 380-385 (1997)

M.Uesaka、T.Watanabe 等人：“同步飞秒电子和激光单脉冲的生产和利用”核材料杂志。

M.Nakazawa: "Application of Opitical Fiber to Radiation Measurements" J.Atomic Energy Society of Japan. 38. 33-38 (1996)

M.Nakazawa：“光纤在辐射测量中的应用”J.Atomic Energy Society of Japan。

M.Uesaka,T.Watanabe et al: "Production and Utilization of Synchronized Femtosecond Electron and Laser Single Pulses" Journal of Nuclear Materials. 248. 380-38● (1997)

M.Uesaka、T.Watanabe 等人：“同步飞秒电子和激光单脉冲的生产和利用”核材料杂志 248. 380-38● (1997)