Updated on 2026/01/06

写真a

 
Takeyoshi Sunagawa
 

Degree

  • Doctor (Engineering)   Coursework ( 1997.3   Fukui University of Technology )

  • Master (Engineering)   Coursework ( 1994.3   Fukui University of Technology )

Research Interests

  • Nanometrology

  • Aging Countermeasure Examination

  • Radiation Chemistry

Research Areas

  • Energy Engineering / Nuclear engineering

  • Nanotechnology/Materials / Fundamental physical chemistry

Education

  • Fukui University of Technology   Department of Applied Physics and Chemistry   Graduated

    1988.4 - 1992.3

  • Fukui University of Technology   Department of Applied Physics and Chemistry   Doctor's Course   Completed

    1992.4 - 1994.3

  • Fukui University of Technology   Department of Applied Physics and Chemistry   Doctor's Course   Completed

    1994.4 - 1997.3

Research History

  • Fukui University of Technology   Department of Applied Physics and Chemistry   Assistant

    1997.4 - 1998.3

  • Japan Society for the Promotion of Science   Fukui Univeresity of Technology   Special researcher of the Japan Society for the Promotion of Science

    1998.4 - 2000.3

  • Osaka University   The Institute of Scientific and Industrial Research   visiting assistant professor

    2004.4 - 2004.6

  • Fukui University of Technology   Professor

    2011.4

  • The National Institute of Advanced Industrial Science and Technology   AIST Tohoku   visiting research engineer

    2012.4 - 2015.3

  • Fukui University of Technology   Professor

    2012.4

  • Fukui University of Technology   Professor

    2012.4

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Professional Memberships

  • Japanese Society of Radiation Chemistry

    1992.4

  • Atomic Energy Society of Japan

    2009.6

  • The Chemical Society of Japan

    1992.4

  • The Physical Society of Japan

    1992.4

  • The Atomic Collision Society of Japan

    1992.4

 

Papers

  • Study on non-destructive diagnosis of graft polymerization by microwave dielectric absorption method Reviewed International coauthorship

    Takeyoshi SUNAGAWA，Ippei UEYAMA，Takaharu IKEDA , Glenn HARVEL

    Memoirs of Fukui University of Technology   ( 55 )   44 - 49   2025.10

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    Graft polymerization of polymeric materials has been evaluated by measuring the grafting rate. In this work, we establish a new non-destructive diagnostic method for evaluating graft polymerization based on the changes in dielectric constant and dielectric loss due to changes in molecular dipole moment using microwave dielectric absorption method.

  • Research and Development of Lead Block Cutting Technique for Decommissioning Nuclear Power Plants Reviewed International coauthorship

    Tomohisa GOTO, Takeyoshi SUNAGAWA, Glenn HARVEL

    Transactions of the Atomic Energy Society of Japan   24 ( 1 )   1 - 12   2025.3

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    Nuclear power plants and research facilities that use radioactive materials employ lead to shield against radiation. Lead must be cut to an appropriate size before being removed from the facility as waste. Because lead is soft, it is difficult to cut using mechanical cutting methods such as reciprocating saws. In this study, we attempted to make lead into a low-melting-point alloy of bismuth and tin (eutectic point 95 °C) and devised a new cutting method that combines mechanical cutting and low-melting-point alloying. For the cutting experiment, we used a Bi-Sn alloy (eutectic point 139 °C) that we prepared and a lead block (50 mm thick). To react the Bi-Sn alloy with the lead block, it was necessary to heat the lead block to 139 °C or higher. Therefore, we conducted a temperature increase experiment on the lead block using a heating wire with thermal conduction and an infrared heater with radiation. The results showed that heating with an infrared heater was superior. The molten Bi-Sn alloy was brought into contact with the heated lead block to make a low-melting-point alloy. Here, a reciprocating saw was used to successfully cut the lead block and remove the low-melting-point alloy that had formed.

  • Establishment of a method for supplying low melting point alloys for cutting lead waste generated during the decommissioning of nuclear power plants Invited Reviewed International coauthorship

    Tomohisa GOTO, Takeyoshi SUNAGAWA, Glenn HARVEL

    Journal of nuclear fuel cycle and environment   32 ( 1 )   3 - 9   2025.6

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    Lead is widely used as a shielding material in nuclear power plants (nuclear and radiation facilities), and lead and lead-containing
    materials contaminated with radioactive materials are generated as waste during decommissioning. The operator must secure a
    disposal site for waste generated during decommissioning. Therefore, operators reduce waste by treating low-level radioactive waste
    below the clearance level through a clearance system. This study aimed to establish a method to precisely cut only the contaminated
    parts with the aim of minimizing the amount of contaminated lead waste. The method involves reacting lead with Bi and Sn to turn
    the lead into a low-melting-point alloy and then cutting it. For this low-melting-point alloying of lead, a method was examined in
    which a Bi-Sn alloy was produced and supplied to the lead. As a result of the study, experiments were conducted to confirm the
    effectiveness of a method in which the Bi-Sn alloy was dripped in liquid form on the lead cutting part and a method in which it was
    poured in paste form. As a result of the experiment, the method in which the Bi-Sn alloy was poured in paste form on the lead cutting
    part was superior in precisely cutting the targeted part.

  • Dose evaluation study of PVA-KI gel dosimeter using RGB analysis method Reviewed International coauthorship

    T. SUNAGAWA, G. HARVEL, C. HISHIKI, S. YOSHIHASHI, and Y. AOKI

    Memoirs of Fukui University of Technology   ( 54 )   43 - 48   2024.10

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    Faculty of Engineering, Department of Applied Nuclear TechnologyIn cancer treatment using radiation, radiation visualization is an essential technology for accurately evaluating dosedistribution. In this research, we developed a new measurement system that combines a blue organic EL light sourcespecialized for PVA-KI gel dosimeters and a digital camera using a macro lens. Using this system, we imaged a PVA-KIgel irradiated with X-rays. The captured image was converted to RGB values. By comparing the photon count resultsobtained by ultraviolet-visible spectroscopy with the B value of RGB values, we clarified the relationship between theB value and the absorbed dose.

  • Elucidation of the bacteria related to malodors in the kendo protective gear warehouse and sterilization of the bacteria by X-ray irradiation as well as deodorization Reviewed

    K. YABE, M. HARA, M. YAMAGUCHI, T. SUNAGAWA, T. TAKESHITA, and S. NISHIJIMA

    Memoirs of Fukui University of Technology   ( 54 )   61 - 71   2024.10

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    Kendo protective gear warehouses in summer have peculiar and unpleasant odors. In this study, we investigated the causes of the odors in a protective gear warehouse and the methods to control them. Bacteria were collected from various types of protective gears and body suits stored in the warehouse. When they were cultured on the standard agar media, the similar unpleasant odors as the warehouse were perceived from the bacteria colonies. Although many kinds of species were identified based on their DNA sequences, a high percentage of spore-forming bacteria such as Bacillus cereus and Priestia megaterium were found. To control the unpleasant odors, Bacillus. cereus and Staphylococcus aureus (spore-non-forming bacteria) were irradiated with various intensities of X-rays. Although S. aureus strains were sterilized at 800 Gray, Bacillus cereus strains were sterilized at 9,000 Gray. Since X-ray irradiation of foods at 10,000Gray or less has been reported to be safe, the irradiation of protective gears and body sui

  • Identification of malodorous substances emitted by bacteria isolated from the kendo protective gear warehouse and their effects on fungal growth Reviewed

    K. YABE, M. HARA, M. YAMAGUCHI, T. SUNAGAWA, T. TAKESHITA, and S. NISHIJIMA

    Memoirs of Fukui University of Technology   ( 54 )   72 - 80   2024.10

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    Bacteria-emitting malodors were detected in the kendo protective gear warehouse. In this study, structures of the malodors were analyzed by using headspace Gas chromatography-mass spectrometry (GC-MS). The results showed that various species of the bacteria commonly and mainly produced organosulfur compounds such as methanethiol,dimethyl disulfide (DMDS), and dimethyl trisulfide (DMTS) as volatile organic compounds (VOCs). When the VOCs were collected at 37°C in GC-MS,DMDS was the major substance, whereas when they were collected at 80°C, DMTS was the major one, suggesting that temperature-induced structural changes from DMDS to DMTS occurred. To clarify the function of these organosulfur compounds, the bacteria were respectively incubated with two kinds of fungi. The VOCs significantly inhibited growth of Aspergillus parasiticus 95DM as well as Penicillium citrinum MI190. The organosulfur compounds also inhibited the same fungal growth. These results indicated that these bacteria inhibit fungal growth by producing these organosulfur compounds such as DMDS and DMTS in nature.

  • Study of in situ measuring device for γ-ray irradiation of PVA-KI gel dosimeter Reviewed

    Takeyoshi SUNAGAWA，Sachiko YOSHIHASHI，Glenn HARVEL，and Yutaro AOKI

    Memoirs of Fukui University of Technology   ( 53 )   46 - 51   2023.10

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    In recent years, in radiation cancer therapy, a technique for easily visualizing radiation and evaluating accurate dose distribution is required. In our laboratory, we have developed a gel dosimeter made from PVA, KI, borax, and fructose, which have the same composition as biological components. Furthermore, in order to clarify the effect of radiation irradiation on the PVA-KI gel dosimeter, we developed a separate type in-situ measurement device that enables in-situ measurement of light absorption of the gel during irradiation. In this study, in order to clarify the characteristics of the PVA-KI gel as a dosimeter, we compared the measurement results using a separate in-situ measurement device and the measurement results using an ionization chamber. Furthermore, we tried to clarify the characteristics of γ-ray irradiation to PVA-KI gel by comparing with the results of X-ray
    irradiation.

  • Dehydration of decommissioning gels for waste reduction Reviewed International coauthorship

    G.Harvel, V.Senka, R.Khurmi, Y.Aoki and T.Sunagawa

    5th Canadian Conference on Waste Management, Decommissioning and Environmental Restoration   2023.8

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    One method of decontamination or capture of loose contaminants during the decommissioning
    process is the use of gels. Gels have some advantages over water based solutions in that spills are
    much easier to clean up while a water based solution may penetrate the concrete or soil and spread
    contaminants further. One disadvantage of gels is that they include other constituents that increase
    the overall waste volume. Thus, will they can do an excellent job of capturing and securing loose
    contaminants, they will increase the total volume shipped to a waste site for disposal. Regardless of
    the hydrocarbon compound used in the gel, there is usually also some water present. In this work,
    we examine two methods for the reduction of the gel volume by eliminating the water content. For
    gels that use water as part of their creation, this can result in waste mass reduction by greater than
    80% and possible volume reduction greater than 85%. The first method assessed is natural
    evaporation processes and the second method assessed is a distillation process. The first process is
    much slower but is more reliable in ensuring that the water is evaporated from the gel leaving a dry
    puck for easy disposal. The second process is able to obtain higher volume reductions faster and is
    also able to breakdown some of the hydrocarbons releasing other non-contaminants however the
    second method is more challenging to ensure there is no carry over the waste product. The paper
    will discuss the nature of the gels tested, both techniques, and the volume reduction results obtained
    to date.

  • Development of in situ measuring device for He ion ion irradiation of PVA-KI gel dosimeter Reviewed International coauthorship

    Takeyoshi SUNAGAWA, Glenn HARVEL, Yutaro AOKI, and Kyo Kume

    Memoirs of Fukui University of Technology   ( 52 )   34 - 39   2022.10

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    In recent years， radiation therapy， which enables local treatment without excising the affected area， has attracted attention in an aging society． In addition， high-precision radiotherapy that gives the maximum dose to the tumor and minimizes the dose to normal tissues is widespread， and it is necessary to perform dose verification in order to make a precise treatment plan． In our laboratory, using partially saponified polyvinyl alcohol (PVA) and potassium iodide (KI) . We have developed a new gel-like chemical dosimeter that has excellent characteristics for X-ray and hevy ion beam visualization in the range of absorbed doses of 2 Gy to 20 Gy. In this study， we constructed a system for in situ measurement of light absorption by gel during He ion beam irradiation and attempted to clarify the characteristics in the absorbed dose range by measuring less than 20 Gy．

  • Thermophysical Characteristics of Liquid Metal In-Bi-Sn Eutectic (Field's Metal) as a Similarity Coolant Reviewed International coauthorship International journal

    Adam Lipchitz, Glenn Harvel, Takeyoshi Sunagawa

    Journal of Nuclear Engineering and Radiation Science   8 ( 3 )   031301-1 - 031301-10   2022.5

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    This work investigated the thermophysical characteristics of liquid indium–bismuth–tin eutectic alloy also known as Field's Metal for the purposes of use as a similar fluid for liquid metal reactors. The density, specific heat capacity, viscosity, thermal conductivity, and the coefficient of thermal expansion were determined for liquid Field's Metal for temperature ranges from its melting point 333 K to 423 K. The work captured the effect of temperature on these properties and each property's magnitude. The findings were used to create mathematical correlations to predict the value of the thermophysical property at a specified temperature for use in natural circulation studies. Notably, the work also observed non-Newtonian shear thinning behavior of the alloy near the melting point and that the non-Newtonian behavior relaxes as the material obtains more energy. The results are consistent with the behavior of other liquid metals including variances that occur close to the melting point.

  • Elucidation of Reaction Mechanism of PVA-KI Gel Dosimeter(Ⅰ) Reviewed

    ( 50 )   97 - 102   2020.10

  • Development of Dose Evaluation Technology using PVA-KI Gel Dosimeter Reviewed

    ( 49 )   93 - 98   2019.12

  • Development of Iodine and Cesium Collection Technique by Ar Plasma (I) Reviewed

    ( 48 )   65 - 69   2018.5

  • DEVELOPMENT OF A GEL TYPE DOSIMETER FOR X-RAY FIELDS Reviewed

    Y. Aoki, G. Harvel, T. Sakura, T. Sunagawa

    Proceedings of the 2017 25th International Conference on Nuclear Engineering (ICONE25-67618)   1 - 5   2017.12

  • Microwave Dielectric Absorption Spectroscopy Aiming at Novel Dosimetry Using DNAs Reviewed

    Yoshinobu Izumi, Makoto Hirayama, Youichirou Matuo, Takeyoshi Sunagawa

    Journal of Radiation Protection and Research   42 ( 1 )   21 - 25   2017.4

  • Evaluation of DNA Damage Using Microwave Dielectric Absorption Spectroscopy Reviewed

    Makoto Hirayama, Youichirou Matuo, Takeyoshi Sunagawa, Yoshinobu Izumi

    Journal of Radiation Protection and Research   41 ( 4 )   339 - 343   2016.12

  • Study of Iodine Collection by Atmospheric Pressure Microwave Discharge Technique Reviewed

    ( 46 )   160 - 168   2016.6

  • Determination of Specific Heat of EutecticIndium ? Bismuth- Tin Liquid Metal Alloys as a Test Material for Liquid Metal - Cooled Applications Reviewed

    Adam Lipchitz, Glenn Harvel, Takeyoshi Sunagawa

    Applied Mechanics and Materials   420   185 - 193   2013.9

  • Example of Career Education in Fukui University of Technology Invited Reviewed

    60 ( 1 )   63 - 64   2012.1

  • Intra-molecular mobility of holes along rod-like helical Si backbones in optically active polysilanes Reviewed

    Y.Honsho, A.Asano, S.Seki, T.Sunagawa, A.Saeki

    Synthetic Metals   159   843 - 846   2009.4

  • The dependence of low-energy electron attachment to CF3Br on electron and vibrational energy Reviewed

    S.Marienfeld, T.Sunagawa, I.I.Fabrikant, M.Braun, M.-W.Ruf, H.Hotop

    The Journal of Chemical Physics   124   154316-1 - 154316-14   2006.4

  • Charge-carrier dynamics in polythiophene films studied by in-situ measurement of flash-photolysis time-resolved microwave conductivity (FP-TRMC) and transient optical spectroscopy (TOS) Reviewed

    A.Saeki, S.Seki, T.Sunagawa, K.Ushida, S.Tagawa

    The Philosophical Magazine   86   1261 - 1276   2006.3

  • Increase in the Mobility of Photogenerated Positive Charge Carriers in Polythiophene. Reviewed

    A.Saeki, S.Seki, Y.Koizumi, T.Sunagawa, K.Ushida, S.Tagawa

    The Journal of Physical Chemistry B   105   10015 - 10019   2005.6

  • Temperature Dependence of Low-Energy Electron Attachment to Halogenated Compounds

    T.Sunagawa

    福井工業大学研究紀要   ( 35 )   223 - 230   2005.3

  • Photochemistry of halogenated anilines studied by time-variation of microwave dielectric absorption Reviewed

    M.Hara, T.Sunagawa, Y.Oseki, T.Majima

    J. Photochemistry and Photobiology, A: Chemistry   163   153 - 158   2004.4

  • Temperature Dependence of Low-Energy Electron Attachment to CHCl3 Reviewed

    T.Sunagawa, H.Shimamori

    International Journal of Mass Spectrometry   205   285 - 291   2001.4

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Presentations

  • Dehydration of decommissioning gels for waste reduction International coauthorship International conference

    G.Harvel, V.Senka, R.Khurmi, Y.Aoki and T.Sunagawa

    5th Canadian Conference on Waste Management, Decommissioning and Environmental Restoration  2023.8  Canadian Nuclear Society

  • Research and development of lead block cutting technique for decommissioning nuclear power plants International coauthorship International conference

    Tomohisa Gotou, Takeyoshi Sunagawa, Glenn Harvel , Yutaro Aoki

    30th International Conference on Nuclear Engineering (ICONE30)  2023.5 

  • Light absorption in situ measurement by γ ray irradiation to PVA-KI gel dose meter International coauthorship

    2022.12 

  • Light absorption in situ measurement by He ion irradiation to PVA-KI gel dose meter International coauthorship

    2022.9 

  • Light absorption in-situ measurement by X-ray irradiation to PVA-KI gel dose meter International coauthorship

    2022.9 

  • Research and development of lead block cutting technique for decommissioning nuclear power plants International coauthorship

    2022.9 

  • Study on reaction mechanism of PVA-KI gel dosimeter (5) International coauthorship

    2022.9 

  • Measurement of Cesium Distribution downstream of a Microwave Induced Argon Plasma International coauthorship International conference

    Y. Nishimura, T. Sunagawa, Glenn Harvel

    ISNTP-12＆ISEHD 2022  2022.9  The Institute of Electrostatics Japan

  • Study on reaction mechanism of PVA-KI gel dosimeter 4 International coauthorship

    2022.3 

  • Study of Separation of Radioactive Cesium Using Argon Plasma

  • Dose evaluation technology study using PVA-KI gel dosimeter 3

  • Development of wiping decontamination technology using gel

  • Research and Development of PVA-KI Gel Dosimeter International conference

    Yutaro Aok, Glenn Harvel, Taguchi Mitsumasa, Naotsugu Nagasawa,Toshiharu Sakura, Takeyoshi Sunagawa

    Pacific Basin Nuclear Conference - 2018 PBNC  American Nuclear Society

  • Study of dose evalution technology using PVA-KI gel dosimeter

  • Development of technology for collecting iodine and cesium using argon plasma Ⅱ

  • Dose evaluation of X-ray from handheld XRF analyzers

  • Radiation Sensitivity of PVA-KI Gel Indicator

  • Development of technology for collecting iodine and cesium using argon plasma

  • マイクロ波誘電吸収法を用いた DNA の損傷評価

    平山 誠，松尾 陽一郎，砂川 武義 ，泉 佳伸

    第54回アイソトープ・放射線研究発表会  日本アイソトープ協会

  • DEVELOPMENT OF A GEL TYPE DOSIMETER FOR X-RAY FIELDS International conference

    Y. Aoki, G. Harvel, T. Sakura, T. Sunagawa

    the 2017 25th International Conference on Nuclear Engineering(ICONE25) 

  • The High-Sensitivity Gel Dosimeter Development for Medical by a New Mechanism

    青木 祐太郎，Glenn HARVEL，佐倉 俊治，砂川 武義

    日本原子力学会　2016年秋の大会  日本原子力学会

  • Fundamental study on novel dosimetry by means of microwave dielectric absorption spectroscopy

  • Study of Potassium Iodide Decomposition-Collection by Atmospheric Pressure Microwave

  • Study of iodine collection by atmospheric pressure microwave discharge technique

  • Characterization of Neutron Fields used Nested Neutron Spectrometer

  • Evaluation of DNA damage using Microwave Dielectric Absorption Spectroscopy International conference

    Makoto HIRAYAMA、Youichirou MATUO、Takeyoshi SUNAGAWA、Yoshinobu IZUMI

    The Eighth International Symposium on Radiation Safety and Detection TechnologyISORD-8 

  • Microwave Dielectric Absorption Spectroscopy Aiming at Novel Dosimetry Using DNAs International conference

    Yoshinobu IZUMI、Makoto HIRAYAMA、Youichirou MATUO、Takeyoshi SUNAGAWA

    The Eighth International Symposium on Radiation Safety and Detection TechnologyISORD-8 

  • Study of Iodine Collection By Atmospheric Pressure Microwave Discharge Technique International conference

    Takeyoshi Sunagawa、Kaho Yamamoto、Glenn Harvel

    The 15th International Congress of Radiation Research (ICRR 2015)  

  • Investigation of Thermal Conductivity and Viscosity of In-Bi-Sn Eutectic for use in a Natural Circulation Experimental Loop International conference

    Adam Lipchitz、Glenn Harvel 、Takeyoshi Sunagawa

    The23rd INTERNATIONAL CONFERENCE ON NUCLEAR ENGINEERING (ICONE23)  

  • Non-contact Quantitative Microwave Detection of Radiation Induced Degradation of Polymers International conference

    Takeyoshi SUNAGAWA、Hitoshi JIBU、Akinori SAEKI、Shu SEKI、Hisaaki KUDO

    5th Asia Pacific Symposium on Radiation Chemistry (APSRC2014) 

  • Generation of Gaseous Iodine for Advanced EHD Collection International conference

    Glenn Harvel、 Takeyoshi Sunagawa

    The International Symposium on Electrohydrodynamics (ISEHD 2014) 

  • Determination of Specific Heat of EutecticIndium ? Bismuth- Tin Liquid Metal Alloys as a Test Material for Liquid Metal - Cooled Applications International conference

    Adam Lipchitz, Glenn Harvel, Takeyoshi Sunagawa

    2013 2nd International Conference on Recent Trends in Materials and Mechanical Engineering (ICRTMME2013)  

  • The detection of the DNA structural change using the microwave dielectric absorption spectrometry and system construction aiming at dosimetry International conference

    Y.Izumi, T.Sunagawa, Y.Matuo, T.Kawada, T.Kojima

    ICRS12&RPSD2012  日本原子力学会

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Industrial property rights

  • ゲル状玩具製作キット

    砂川武義、速水醇一、江藤浩一、金井兼

 

Teaching Experience

  • Basic Chemistry

    Institution：Fukui University of Technology

  • Experiments in Nuclear Engineering

    Institution：Fukui University of Technology

  • Radiation Biology

    Institution：Fukui University of Technology

  • Radiation Chemistry

    Institution：Fukui University of Technology

  • Radiation Engineering

    Institution：Fukui University of Technology

  • Radiation Fundamentals

    Institution：Fukui University of Technology

  • Research for Graduation

    Institution：Fukui University of Technology

  • Advanced Experiment for Application of Nuclear Technology

    Institution：Fukui University of Technology

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