@inproceedings{oai:repo.qst.go.jp:00053548,
 author = {Satou, Yukio and Ohsawa, Daisuke and Higashi, Akio and Kawachi, Kiyomitsu and Hirabayashi, Masataka and Okada, Yuki and Uehara, Shuzou and Nikjoo, H and Soga, Fuminori and 佐藤 幸夫 and 大澤 大輔 and 東 明男 and 河内 清光 and 平林 誠貴 and 岡田 裕樹 and 曽我 文宣},
 book = {Atomic and Molecular Data and their Applications: Joint Meeting of the 14th International Toki Conference on Plasma Physics and Controlled Nuclear Fusion (ITC14) and The 4th International Conference on Atomic and Molecular Data and Their Applications (ICAMDATA2004) (AIP Conference Proceedings 771)},
 month = {May},
 note = {We measured the energy and angular distributions (7 eV-10 keV and 20&#730;-160&#730;) of secondary electrons produced in collisions of 6.0 MeV/u He2+ ions with water vapor. Binary-encounter collision peaks were clearly observed at the calculated energies at angles of &#61500;90&#61616;, as well as the K-LL Auger peak of oxygen at about 500 eV for all angles. From these measurements, the doubly differential cross sections (DDCS) of electron emissions were deduced with an estimated uncertainty of &#61617;13%. The energy distribution (SDCS) was also obtained by integrating the DDCS values with respect to the ejected angles, and compared with an empirical model of Rudd. The energy spectrum (SDCS) showed good agreement with the model of Rudd in the energy range of secondary electrons of <100 eV. However, in the 100-1000 eV energy range, the experimental spectrum shows significant discrepancies, smaller by 30 percents, and is nearly twice greater in the region >3keV. To assess the new cross sections, these values were incorporated in the kurbuc Monte-Carlo track structure code system for a simulation of secondary electrons. Radial dose distributions for 6.0 MeV/u He2+ ions were obtained by analyzing the tracks generated by the code kurbuc using the new DDCS values. In the core with a radius (r) of less than 1 nm, the dose is very high due mainly to excitation events, induced by low-energy electrons. The penumbra shows a well-known r-2 dependence.},
 pages = {128--137},
 publisher = {American Institute of Physics},
 title = {Secondary Electrons from Water Vapor with the Impact of 6.0 MeV/u He2+ Ions: Atomic Data and their Application to Biomedical Investigations},
 year = {2005}
}