1995 Fiscal Year Final Research Report Summary
Technique of Dynamical Observation of Atomic Scale Structural Change and Initial Stage of Neutron Radiaton Damage
| Project/Area Number |
06558072
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| Research Category |
Grant-in-Aid for Developmental Scientific Research (B)
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| Allocation Type | Single-year Grants |
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| Research Field |
Nuclear fusion studies
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| Research Institution | Nagoya University |
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Principal Investigator |
KIRITANI Michio Nagoya University, Engineering, Professor, 工学部, 教授 (70033826)
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| Co-Investigator(Kenkyū-buntansha) |
NARUSE Mikio JEOL Ltd., Central Tech.Lab., Chief Investigator, 研究員
YOSHIIE Toshimasa Kyoto University, Reactor Institute, Professor, 原子炉実験所, 教授 (20124844)
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| Project Period (FY) |
1994 – 1995
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| Keywords | Lattice Defects / Point Defects / Stochastic Fluctuation / Radiation Damage / High Voltage Electron Microscope / Electron Radiation Damage / Neutron Irradiation / Ion Irradiation |
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| Research Abstract |
Only the brief description is made on neutron irradiation : a steady progress has been made with controlled irradiation with the fission reactor JMTR,referred to the results of fusion neutron irradiaton with RTNS-II.
Specially emphasized is the first success of the electron irradiation of neutron irradiated samples, by establishing radiation harzard control area in the High Voltage Electron Microscopy Laboratory of Nagoya University. The nature of very small point defect clusters produced by collision cascades was identified reliably from their behavior under electron irradiation. Annealing behavior of neutron irradiation induced defects in various materials was pursued to understand both the formation mechanism of the clusters from cascades and the effect of temperature variation during eutron irradiaton.
The other dynamical observation of various defect behavior under high energy electron irradiation disclose the followings. (1) One dimensional easy motion of small interstitial clusters was found to be responsible for the crystallographic orientation dependence of neutron-irradiation-induced dislocation structures. (2) Stochastic fluctuation of point defect reactions deduced from the observation and analysis of the growth and shrinkage of small point defect clusters made us to understand the very small success probability of the growth of interstitial clusers from the embryo made by collision cascades. (3) One dimensional motion of interstital atoms was detected by localized electron irradiation experiment, and (4) fundamental defect parameters were measured by the development of intermittent electron irradiation technique.
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