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Recoil Energy Effects in High Energy Particle Irradiation

高能粒子辐照中的反冲能量效应

基本信息

批准号：
05402049
负责人：
KIRITANI Michio
金额：
$ 22.27万
依托单位：
Nagoya University
依托单位国家：
日本
项目类别：
Grant-in-Aid for General Scientific Research (A)
财政年份：
1993
资助国家：
日本
起止时间：
1993 至 1995
项目状态：
已结题

来源：
https://kaken.nii.ac.jp/grant/KAKENHI-PROJECT-05402049/
关键词：
High Energy Particle Irradiation Fusion Neutron Irradiation Fission Reactor Irradiaton Ion Irradiation Electron Irradiation Radiation Damage Recoil Energy Stochastic Fluctuation

项目摘要

Point defect clusters produced from collision cascades are very small and the identification of their nature was not easy. The establishment of radiation hazard control area on High Voltage Electron Microscopy Laboratory of Nagoya University has enabled to irradiate neutron irradiated radioactive samples with high energy electrons, and the reliable identification became possible from the behavior of each defects under electron irradiation.Further progress was made on the research of fusion neutron (RTNS-II) irradiated samples, and the controlled irradiation with a fission reactor (JMTR) proceeded to temperature-cycle irradiation and irradiations with multi-section removable rigs to obtain the data on the continuous progress of defect structure evolution. Direct comparison of fission neutron irradiation with those of fusion neutron irradiation became possible for the first time.Accumulation modes (irradiation dose phi) of defects produced directly from collision cascades were clarified from summing up the result of fusion and fission neutron irradiatoin and light and heavy ion irradiation : Very early stage by impact effect from collisions (phi^2), Simple stage proportional to irradiaton dose (phi^1), Stage with recovery by the reaction of freely migrating interstitials (phi^<1/2>), and Stage of geometrical overlap of defects (1-exp (-alphaphi) ).Applying the result of easy motion of small interstitial clusters obtained from electron irradiaton experiment to neutron irradiation, unsolved problems such as crystallographic orientation dependence were solved. Also, applying the fluctuation of point defect reactions obtained from electron irradiatoin, the origin of very small success probability of interstitial cluster growth from small interstitial clusters made by collision cascades was understood.

碰撞级联产生的点缺陷簇非常小，其性质的识别并不容易。名古屋大学高压电子显微镜实验室设立了辐射危害控制区，可以用高能电子辐照中子辐照的放射性样品，根据电子辐照下的各种缺陷的行为可以可靠地识别。聚变中子（RTNS-II）辐照样品的研究取得了进一步进展，从裂变堆（JMTR）控制辐照到温度循环辐照和多节可移动装置辐照，获得缺陷结构演化的连续进展数据。裂变中子辐照与聚变中子辐照的直接比较首次成为可能。通过对聚变、裂变中子辐照和轻、重离子辐照结果的总结，阐明了碰撞级联直接产生缺陷的辐照剂量φ：由碰撞效应引起的极早期阶段（φ ^2），与辐照剂量成正比的简单阶段（φ ^1），由自由迁移物质的反应恢复的阶段（φ ^<1/2>）和缺陷的几何重叠阶段（1-exp（-φ））.将电子辐照实验中得到的小间隙团簇易运动的结果应用于中子辐照，解决了诸如晶体学取向依赖性等尚未解决的问题.利用电子辐照点缺陷反应的涨落，解释了碰撞级联产生的小间隙团簇生长成功概率很小的原因。