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Akamatsu, Ken; Fujii, Kentaro; Yokoya, Akinari
International Journal of Radiation Biology, 80(11-12), p.849 - 853, 2004/11
Times Cited Count：11 Percentile：58.46(Biology)The productions of stable/unstable thymine radicals produced by monochromatic ultrasoft X (USX)- or 
Co 
-rays were studied using EPR spectroscopy. EPR experiment of thymine was performed using a newly developed X-band EPR device installed in a JAERI soft X-ray beamline (BL23SU) in SPring-8. The sample pellet was irradiated with USX photons at a microwave in a vacuum chamber. EPR measurements of a thymine powder pellet irradiated with USX around 500 eV at 77 K and RT. As a reference, Co g-irradiation to the pellet was also performed at RT. As the results, following three findings are obtained: (1) An unstable radical appearing only in situ USX-irradiation is observed. And the radical is clearly distinguished with other stable radicals remaining after irradiation. (2) The signal of the unstable radical is a strong singlet, which vanishes after irradiation immediately.
Co -rays in the solid stateAkamatsu, Ken; Fujii, Kentaro; Yokoya, Akinari
Radiation Research, 161(4), p.442 - 450, 2004/04
Times Cited Count：10 Percentile：28.92(Biology)HPLC analyses were performed for condensed thymine irradiated with monochromatic synchrotron ultrasoft X-rays (USX) in the energy region around N and O K-edges. Co -rays were used as a reference radiation. The radiation chemical dose-response of each separated thymine decomposition product was also determined. Uracil, 5-(hydroxymethyl)uracil, 5,6-dihydrothymine, 5-formyluracil and four main unknown products were found in the HPLC chromatogram of the USX sample irradiated in vacuo. Similar spectra of the products were also found in the -ray experiment, however, some unknown products appeared after elution of thymine peak were significantly larger than those in the USX experiment. This result indicates the difference in radiation quality.
Yokoya, Akinari; Akamatsu, Ken; Fujii, Kentaro
Nuclear Instruments and Methods in Physics Research B, 199, p.366 - 369, 2003/01
Times Cited Count：3 Percentile：27.66(Instruments & Instrumentation)no abstracts in English
Pinak, M.
Journal of Computational Chemistry, 22(15), p.1723 - 1731, 2001/11
Times Cited Count：3 Percentile：21.86(Chemistry, Multidisciplinary)no abstracts in English
Pinak, M.
Proceedings of 10th International Congress of the International Radiation Protection Association (IRPA-10) (CD-ROM), 5 Pages, 2000/00
no abstracts in English
