The Institute of Scientific and Industrial Research, Osaka University


LAST UPDATE 2017/02/26

  • 研究者氏名
    Researcher Name

    室屋裕佐 Yusa MUROYA
    准教授 Associate Professor
  • 所属
    Professional Affiliation

    The Institute of Scientific and Industrial Research, Osaka University

    Department of Beam Materials Science
  • 研究キーワード
    Research Keywords

    Radiation chemistry
    Water chemistry in nuclear engineering
    High temperature / high pressure, and supercritical fluids
Research Subject
Study on radiation induced chemical reactions at extreme conditions

研究の背景 Background


Application of quantum beam is rapidly expanding in the various industrial fields such as cancer therapy, production of semiconductor devices etc. It is recognized that materials are decomposed by the ionizing radiation to form free radicals, electrons and molecular products in isolated nano-scale space (by 10-12 sec), which subsequently undergo diffusion chemical reactions. As those radiolytic products give adverse effects in corrosion behaviors of structural materials in nuclear power plants, it is of great importance to study and develop novel techniques to control the radiation-induced processes at high temperatures, or even supercritical conditions.

研究の目標 Outcome


By using linear accelerators (ultra-short electron beam) and Co-60 gamma-ray sources, yields and fast reaction kinetics of the radiolytic species induced in high temperature/pressure conditions, or even supercritical state, are investigated. Moreover, by employing numerical simulations based on a stochastic model and a Monte-Carlo method as well, we are targeting to establish the whole view of the reaction mechanisms, and also to develop novel strategies to control the new reaction schemes.

研究図Research Figure

Fig.1. (a) Synchronized relativistic ultra-short electron beam and Ti:Sa fs laser. (b) Trajectories of the electron beam injected into H2O Fig.2. Fast reaction scheme of the radiolysis of water, and ps-ns time dependent yields of the hydrated electron at elevated temperatures. Fig.3. Temperature dependent rate constant for bimolecular self-reaction of the hydrated electron to form molecular hydrogen.

文献 / Publications

J. Phys. Chem. Lett., 1, 331 (2010), Phys. Chem. Chem. Phys., 13, 10690 (2011), Chem. Phys. Lett., 508, 224 (2011), Phys. Chem. Chem. Phys., 14, 14325 (2012),
Phys. Chem. Chem. Phys., 14, 16731 (2012). “Supercritical-pressure light water cooled reactors”, Springer, ISBN:978-4-431-55024-2 , pp.347-375 (2014).