Investigation for methods of micro-structural observation of beryllium metals by TEM

Ito, Masayasu ; Kawamata, Kazuo; Sozawa, Shizuo; Shibata, Akira ; Tsuchiya, Kunihiko ; Kitsunai, Yuji*; Kodama, Mitsuhiro*

In JMTR, beryllium metal is used for neutron reflector. However, the periodical exchange of the neutron reflector is necessary due to degradation of strength and swelling under neutron irradiation. So it is required to select the material that bears long term from the viewpoint of the utilization rate improvement and the radioactive waste decrease in JMTR. It is important to evaluate the characteristics of beryllium metals precisely. This report describes the preparation method of the sample and observation results by the transmission electron microscope that is being examined as a evaluation method of the beryllium metal.