1986 Fiscal Year Final Research Report Summary
Development of 4.2K Cryo-transfer Appratus for Electron Microscope Observation of Low Temperature Neutron-Irradiated Specimens
| Project/Area Number |
59880017
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| Research Category |
Grant-in-Aid for Developmental Scientific Research
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| Allocation Type | Single-year Grants |
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| Research Field |
Nuclear engineering
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| Research Institution | HIROSHIMA UNIVERSITY |
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Principal Investigator |
SHIMOMURA Yoshiharu Faculty of Engineering, Hiroshima University, 工学部, 教授 (40033831)
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| Co-Investigator(Kenkyū-buntansha) |
YOSHIDA Hiroyuki Institute of Research Reactor, Kyoto Univ., 原子炉実験所, 助教授 (00027442)
YOSHIDA Naoaki Institute of Applied Mechanics, Kyushu Univ., 応用力学研究所, 教授 (00127317)
KIRITANI Michio Faculty of Engineering, Hokkaido University, 工学部, 教授 (70033826)
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| Project Period (FY) |
1984 – 1986
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| Keywords | Low Temperature Electron Microscopy / Cryo-transfer 4.2 K TEM holder / D-T Neutron Irradiation / Displacement Cascade Damages / Rotating Target Neutron Source (RTNS-II) / 4.2K Cryo-transfer Appratus / Fission Neutron Irradiation / 中性子照射損傷発達過程 |
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| Research Abstract |
To make possible the observation of nascent displacement cascade damages in metal specimens which are irradiated at very low temperature by neutrons and cold-transferred from irradiation cryostat to electron-microscope, a new type of cryo-transfer TEM holder is designed and fabricated by JEOL. The holder can be cooled down to 9 K at the specimen position during a TEM observation and also during a cryo-transfer from cryo-transfer chamber to TEM specimen chamber. The appratus we fabricated was sucessfully used to observe the nascent state of displacement cascade damages in metals which were irradiated at 15 K by D-T neutrons at RTNS-II in LLNL. Pre-thinned TEM specimens were irradiated using HELI-TRAN cryostat. After the irradiation cryostat was feeded to the cryo-transfer chamber that we fabricated in this work. The irradiation cryostat was dismounted in the chamver without warm-up the specimens. The specimens were cold-transferred to cryo-transfer TEM holder below 18 K. The holder was moved using special designed car keeping the specimen below 18 K and also keeping them clean. The cascade damage structure was determined by TEM observation at 20 K. It was also observed during heat-up of specimens how the displacement cascade damage relax in their structure.
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