Physics and Dosimetry (Please put your favorite session title)
A simulation method based on molecular dynamics (Title of your
presentation here with Arial bold, 12pt)
Takeshi Kai, Mariko Higuchi, Kentaro Fujii (Authors with Arial, 12pt)
Japan Atomic Energy Agency, 2-4 Shirakatashirane, Tokai, Naka, Ibaraki
319-1195, Japan ( Authors' affiliations with Arial Italic, 12pt)
We have proposed a simulation method based on the molecular dynamics
to understand the role of the Auger effect with irradiation of monochromatic
soft X-rays. The dynamics of the free electrons generated with the radiation
damage is described by using Newton equation. The photo-absorption
ionization, the elasticity scattering, the electron impact ionization, and the
Auger decay are considered as atomic processes for the radiation damage.
Using this simulation method, there is a possibility to understand the time
evolution of the DNA damage induced by the radiation in detail.
Recently, Fujii et al. [1] reported interesting results that the strand breaks
or the nucleobase lesions of DNA damage are selectively enhanced by the
irradiation of monochromatic soft X-rays in the energy region from 270 ~ 760
eV. In those experimental conditions, the photoelectrons are generated with
the photo-absorption ionization irradiated with soft X-rays if its energy is larger
than K-shell ionization energy, and Auger electrons are generated in the order
of tens of femtoseconds after. In addition, the secondary electrons will be also
generated with the electron-impact ionization. Using the simulation method
with the time evolution, we will attempt the analysis of their experimental
results in this study. The results will be discussed in the symposium.
[1] K. Fujii et al., J. Phys. Chem. B 113, 16007 (2009)
Please keep your abstract within one page.