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The disciplinary name "Radiation Chemistry" might make you think it is difficult to study without special knowledge or experience on Chemistry. However, "Radiation Chemistry" is historical name and slightly different from the area it covers. We treat not only chemistry but also physics, physical chemistry, and biochemistry, so "Radiation Science" might be more suitable to express our research field. Anyway, you can challenge topics you are interested in with utilizing your own talent and experience.

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Radiation Protection Mechanism of Antioxidants


[References]

  • K. Hata, A. Urushibara, S. Yamashita, et al., "Chemical repair activity of free radical scavenger edaravone: reduction reactions with dGMP hydroxyl radical adducts and suppression of base lesions and AP sites on irradiated plasmid DNA", Journal of Radiation Research 56 (1) 59-66 (2015). Click here to see the article.

  • K. Hata, A. Urushibara, S. Yamashita, et al., "Chemical repair of base lesions, AP-sites, and strand breaks on plasmid DNA in dilute aqueous solution by ascorbic acid", Biochemical and Biophysical Research Communications 434 (2) 341-345 (2013). Click here to see the article.

  • K. Hata, M. Lin, Y. Katsumura, et al., "Pulse Radiolysis Study on Free Radical Scavenger Edaravone (3-methyl-1-phenyl-2-pyrazolin-5-one). 2: A Comparative Study on Edaravone Derivatives", Journal of Radiation Research 52 (1) 15-23 (2011).Click here to see the article.


* Collaboration with Dr. Yokoya et al. (Tokai Quantum Beam Science Center, QST).




Water Radiolysis with Therapeutic High-Energy Heavy Ion Beams


Verification of "Oxygen-in-the-track Hypothesis"


[References]

  • S. Yamashita, Y. Katsumura, M. Lin, et al., "Water radiolysis with heavy ions of energies up to 28 GeV. 1. Measurements of primary g values as track segment yields", Radiation Physics and Chemistry 77 (4) 439-446 (2008).Click here to see the article.

  • S. Yamashita, Y. Katsumura, M. Lin, et al., "Water radiolysis with heavy ions of energies up to 28 GeV-2: Extension of primary yield measurements to very high LET values", Radiation Physics and Chemistry 77 (10-12) 1224-1229 (2008).Click here to see the article.

  • S. Yamashita, Y. Katsumura, M. Lin, et al., "Water radiolysis with heavy ions of energies up to 28 GeV. 3. Measurement of G(MV•+) in deaerated methyl viologen solutions containing various concentrations of sodium formate and Monte Carlo simulation", Radiation Research 170 (3) 521-533 (2008).Click here to see the article.

  • T. Oka, S. Yamashita, et al., "Spin-Trapping Reactions of a Novel Gauchetype Radical Trapper G-CYPMPO", Analytical Chemistry 83 (24) 9600-9604 (2011).Click here to see the article.

  • S. Yamashita, M. Taguchi, G. Baldacchino, Y. Katsumura, "Charged Particle and Photon Interactions with Matter - Recent Advances, Applications, and Interfaces -" Ed. by Y. Hatano, Y. Katsumura, A. Mozumder, CRC Press, Boca Raton, December 2010.

  • Invited talk in ASR2007, Novemver, 2007, Tokai-mura, Japan.

  • Invited talk in JECR2010, May 2010, Bordeaux, France.

  • 日本放射線化学会,奨励賞「治療用重粒子イオンビームの放射線化学反応の展開」,2010年9月.


* Conducted as a part of Research Project with Heavy Ions at NIRS-HIMAC. Collaboration with NIRS, QST.




Radiation Effect on Seawater and Aqueous Solutions of Halogen Anions

 
[References]

  • S. Yamashita, K. Iwamatsu, et al., "Sequential radiation chemical reactions in aqueous bromide solutions: pulse radiolysis experiment and spur model simulation", RSC Advances 5 (33) 25877-25886 (2015). Click here to see the article.

  • Invited talk in the 13th Biennial Trombay Symposium on Radiation & Photochemistry and the 6th Asia-Pacific Symposium on Radiation Chemistry. (TSRP-APSRC-2016), January 5-9, 2016, Mumbai, India.


* Collaboration with Dr. Hata (NSRC, JAEA) and Prof. Muroya (ISIR, Osaka University).




Radiation Chemistry in Hydrogel (Water-Polymer Gel)


[References]

  • S. Yamashita, A. Hiroki, M. Taguchi, et al., "Radiation-induced change of optical property of hydroxypropyl cellulose hydrogel containing methacrylate compounds: As a basis for development of a new type of radiation dosimeter", Radiation Physics and Chemistry 101 53-58 (2014). Click here to see the article.

  • S. Yamashita, J. Ma, J.-L. Marignier, et al., "Radiation-Induced Chemical Reactions in Hydrogel of Hydroxypropyl Cellulose (HPC): A Pulse Radiolysis Study", Radiation Research 185 (6) 650-658 (2016). Click here to see the article.

  • A. Hiroki, S. Yamashita, A. Kimura, et al., "Effect of Heavy Ion Irradiation on Optical Property of Radiation-crosslinked Hydroxypropyl Cellulose Gel Containing Methacrylate Monomers", Nuclear Instruments and Methods in Physics Research Section B: Beam Interactions with Materials and Atoms 365 581-586 (2015). Click here to see the article.

  • A. Hiroki, S. Yamashita, M. Taguchi, et al., "Enhancement in Dose Sensitivity of Polymer Gel Dosimeters Composed of Radiation-Crosslinked Gel Matrix and Less Toxic Monomers", Journal of Physics: Conference Series 573 (1) 012028 (2015). Click here to see the article.

  • A. Hiroki, S. Yamashita, Y. Sato, et al., "New Polymer Gel Dosimeters Consisting of Less Toxic Monomers with radiation-crosslinked gel matrix", Journal of Physics: Conference Series 444 (1) 012028 (2013). Click here to see the article.


* Collaboration with Takasaki Institute, QST. Development of gel dosimeter is conducted at Takasaki Institute.




Radiation-induced Reactions in Molten Salts


[References]

  • Invited talk in the 29th Miller Conference on Radiation Chemistry, March 14-19, 2015, Windermere, UK.

  • Invited talk in the 3rd Workshop on Radiation Effects in Nuclear Technology (RENT3), June 20-21, 2016, Hefei, China.







Sensitive Detection of OH Radicals with Fluorescent Probe and its Application in Quantitative Estimation of Nuclear Fragmentation Effect on OH Yield


[References]

  • S. Yamashita, G. Baldacchino, T. Maeyama, et al., "Mechanism of radiation-induced reactions in aqueous solution of coumarin-3-carboxylic acid: Effects of concentration, gas and additive on fluorescent product yield", Free Radical Research 46 (7) 861-871 (2012). Click here to see the article.

  • T. Maeyama, S. Yamashita, G. Baldacchino, et al., "Production of a fluorescence probe in ion-beam radiolysis of aqueous coumarin-3-carboxylic acid solution-1: Beam quality and concentration dependences", Radiation Physics and Chemistry 80 (4) 535-539 (2011). Click here to see the article.

  • T. Maeyama, S. Yamashita, M. Taguchi, et al., "Production of a fluorescence probe in ion-beam radiolysis of aqueous coumarin-3-carboxylic acid solution-2: Effects of nuclear fragmentation and its simulation with PHITS", Radiation Physics and Chemistry 80 (12) 1352-1357 (2011).Click here to see the article.

  • G. Baldacchino, T. Maeyama, S. Yamashita, et al., "Determination of the time-dependent OH-yield by using fluorescent probe. Application to heavy ion irradiation", Chemical Physics Letters 468 (4-6) 275-279 (2009). Click here to see the article.


* Conducted as a part of Research Project with Heavy Ions at NIRS-HIMAC. Collaboration with NIRS, QST.




Water Radiolysis at Elevated Tempratures


Observation of Ultrafast Reactions in Picosecond Range


[References]

  • M. Lin, H. Fu, I. Lampre, et al., "Pulse Radiolysis Studies on the Temperature-Dependent Spectrum and the Time-Dependent Yield of Solvated Electron in Propane-1,2,3-triol", Journal of Physical Chemistry A 113 (44) 12193-12198 (2009). Click here to see the article.

  • Y. Yan, M. Lin, Y. Katsumura, et al., "Temperature and density effects on the absorption maximum of solvated electrons in sub- and super-critical methanol", Canadian Journal of Chemistry 88 (10) 1026-1033 (2010). Click here to see the article.

  • S. Yang, Y. Katsumura, S. Yamashita, et al., "Radiolysis of Boiling Water", Radiation Physics and Chemistry 123 14-19 (201)6. Click here to see the article.

  • J. Ma, S. Yamashita, Y. Muroya, et al., "Deciphering the Reaction between a Hydrated Electron and Hydronium Ion at Elevated Temperatures", Physical Chemistry Chemical Physics 17 (35) 22934-22939 (2015). Click here to see the article.


    • * Collaboration with Prof. Muroya (ISIR, Osaka University).

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The University of Tokyo