TOYOHARA Masumitsu


Faculty of Engineering, Division of Intelligent Systems Engineering


Specially Appointed Professor

Research Fields, Keywords

Technologies for Heavy-Ion Radiotherapy Systems for Cancer Treatment

Graduating School 【 display / non-display

  • 1976.04

    Kyushu University   Faculty of Engineering   Graduated

Graduate School 【 display / non-display

  • 1980.04

    Kyushu University  Graduate School, Division of Integrated Science and Engineering  Master Course  Completed

Degree 【 display / non-display

  • Doctor (Engineering) -  Kyushu University

  • Master of Engineering -  Kyushu University

Academic Society Affiliations 【 display / non-display

  • 1986

    Atomic Energy Society of Japan

  • 2007

    Society of Chemical Engineers, Japan


Books 【 display / non-display

Papers 【 display / non-display


    川野昌平、林貴広、森島康雄、高橋優也、豊原尚実、V. バクラノフ、A. コロデニコフ,V.ズーエフ

    ICAPP 2017 国際会議プロシーディング     2017.06

    Joint Work

  • Geopolymer Solidification of Intermediate Level Waste


    Waste Management     2017.03  [Refereed]

    Joint Work

  • Development of Cement Solidification Technique for Sodium Borate Waste Produced in PWR Plant

    H. Okabe, K. Matsuyama, M. Toyohara, Y. Satoh, T. Motohashi

    Proc. Symp. Waste Manag., Phoenix, Arizona, 16061(2016)     16061   2016.03  [Refereed]

    Joint Work

  • Effect of Sodium/Bron Mole Ratio on the Cement Solidification for Sodium Borate Waste Produced in PWR Plant


    Proc. Symp. Waste Manag., Phoenix, Arizona, 15261(2015)     2015.03  [Refereed]

    Joint Work

  • Development of Cement Solidification Process for Sodium Borate Waste Generated from PWR Plant

    H. Okabe, T. Sato, Y. Shoji, Y. Haruguchi, M. Kaneko, M. Saso, M. Toyohara

    Proc. ASME 2013 15th Int. Conf. Environ. Remidi. Radio. Manag., 2013 ( ASME )    2013.09  [Refereed]

    Joint Work

     View Summary

    A cement solidification process for treating sodium borate waste produced in pressurized water reactor (PWR) plants was studied. To obtain high volume reduction and high mechanical strength of the waste, simulated concentrated borate liquid waste with a sodium / boron (Na/B) mole ratio of 0.27 was dehydrated and powdered by using a wiped film evaporator. To investigate the effect of the Na/B mole ratio on the solidification process, a sodium tetraborate decahydrate reagent with a Na/B mole ratio of 0.5 was also used. Ordinary Portland cement (OPC) and some additives were used for the solidificaiton. Solidified cement prepared from powdered waste with a Na/B mole ratio 0.24 and having a high sillica sand content (silica sand/cement>2) showed to improved uniaxial compressive strength.

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Academic Awards Received 【 display / non-display

  • "Superior Paper" at the WM2017 Conference

    2017.03.29   WM Symposia, Inc. USA   Geopolymer Solidification of Intermediate Level Waste

    Winner: Kanae Matsuyama, Hirofumi Okabe, Chiaki Shimoda, Masaaki Kaneko, Michitaka Saso, Masumitsu Toyohara

     View Summary

    To reduce the amount of hydrogen generated due to water radiolysis in stored intermediate-level waste, geopolymer solidification, followed by drying, was studied. From the viewpoints of high thermal stability and low processing cost, geopolymer solidification is an excellent method for conditioning intermediate level waste. In this study, in order to determine if radioactive waste could be treated using geopolymer solidification, tests were conducted by using a simulated slurry generated from contaminated water treatment. The uniaxial compressive strength of the geopolymer solidified waste containing 50 wt.% of the slurry was more than 10 MPa. To reduce the amount of hydrogen generated, the geopolymer-solidified waste was dehydrated, and the water content of the remaining solid was less than 1 wt.%. Moreover, the value of the uniaxial compressive strength of dehydrated geopolymer-solidified waste was similar to that of the untreated one. The volume reduction rate of the slurry solidification was obtained at the applicability limit.

  • Award from National Nuclear Center of Republic of Kazakhstan

    2013.12.04   National Nuclear Center of Republic of Kazakhstan   AWARD

    Winner: Masumitsu Toyohara

  • 1982 International Metallographic Exhibit