• Research Divisions
• Division of Nuclear Engineering Science
• Division of Quantum Beam Material Science
• Neutron Material Science
• Neutron Optics
• Nuclear Beam Material Science
• Nuclear Radiation Physics
• Radiation Material Science
• Materials Radiation Effects
• Isotope Production and Application
• Division of Radiation Life Science
• Research Center for Safe Nuclear System
• Particle Radiation Oncology Research Center

Materials Radiation Effects

Professor

• KINOMURA, Atsushi, e-mail: akinomura<atmark>

Associate Professor

• XU, Qiu e-mail: xu<atmark>

Assistant Professor

• YABUUCHI, Atsushi e-mail: yabuuchi<atmark>
  (concurrent)

* replace <atmark> with ＠rri.kyoto-u.ac.jp

Irradiation of high energy particles induces the interaction with atoms in solids and the loss of their energies. In this division, we perform research subjects to understand irradiation effects for various materials such as metals and semiconductors: (1) Irradiation of neutron, ion and electron, (2) Characterization of irradiated materials using positron annihilation spectroscopy, electron microscopy and thermal desorption spectroscopy, and (3) Numerical simulation for interactions of irradiation-induced defects.

As high-energy particle irradiation techniques, various irradiation equipment have been developed for neutron irradiation at high temperatures by Material Controlled Irradiation Facility (SSS) of Kyoto University research Reactor (KUR), electron irradiation at low, ambient and high temperatures by a linear accelerator (KURRI-LINAC), and ion irradiation by small ion accelerators.

As surface characterization techniques for irradiated materials, a reactor-based slow positron beam system using KUR has been developed. This system is one of the most advanced equipment in the world and has been developed for positron annihilation lifetime spectroscopy, Doppler broadening, and coincidence measurements with these analytical techniques. Other analytical techniques such as radioisotope-based positron annihilation spectrometry have been used for applied research for various materials.

It is expected that research in this field promotes materials developments for new-type nuclear systems and fusion reactors.  In addition, it is possible to get information on damage mechanism and lifetimes of nuclear materials under irradiation, reduction of ion-irradiation damage in semiconductor device processes and irradiation-induced new-material synthesis.

Fig. 1. Reactor-based slow positron beam system at the KUR B1 hole.