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In memoriam: Prof. Michio Kiritani.

On January 23rd, 2003, Professor Michio Kiritani passed away at the age of 70. He was an internationally recognized Japanese scientist who contributed significantly to the field of high energy particle irradiation effects in metals.

He was born on June 4, 1932, in Tokyo, Japan, and received a Bachelor's degree (1955) from Okayama University and a Master's degree (1961) from Illinois University. He was affiliated with a large number of universities and research institutes, including Hiroshima University (1969), Osaka University (1971), Hokkaido University (1982), Nagoya University (1987) and Hiroshima Institute of Technology (1996). He was also a visiting researcher of Rutgers University (1968-1969), Max-Planck-Institute, Stuttgart (1978-1979) and Kyoto University (1993-1994).

During his stay at Hokkaido University, he devoted his time to the research of fusion neutron irradiation. He served as the chief investigator of the damage of solid materials in Japan-US Collaboration Program utilizing an intense fusion neutron source, RTNS-II, at Lawrence Livermore National Laboratory. Even now the systematic data he obtained with his collaborators are unique and have not been replaced. The results led to information about the structure of large collision cascades including their subdivision to subcascades, recoil energy spectrum analysis, which leads to the estimation of the energy deposition density. The detection of the role of freely migrating point defects and the point defect reaction by the effect of collision impact should also be mentioned.

His loss will be deeply felt. Please send regrets to: Toshimasa Yoshiie (
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Publication:Fusion Power Report
Geographic Code:9JAPA
Date:Mar 1, 2003
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