Abstract:
:In an effort to understand the basic mechanism of the action of charged particles in solid radiation dosimeters, we extend our Monte-Carlo code (MC4) to condensed media (liquids/solids) and present new track-structure calculations for electrons and protons. Modeling the energy dissipation process is based on a model dielectric function, which accounts in a semi-empirical and self-consistent way for condensed-phase effects which are computationally intractable. Importantly, these effects mostly influence track-structure characteristics at the nanometer scale, which is the focus of radiation action models. Since the event-by-event scheme for electron transport is impractical above several kilo-electron volts, a condensed-history random-walk scheme has been implemented to transport the energetic delta rays produced by energetic ions. Based on the above developments, new track-structure calculations are presented for two representative dosimetric materials, namely, liquid water and silicon. Results include radial dose distributions in cylindrical and spherical geometries, as well as, clustering distributions, which, among other things, are important in predicting irreparable damage in biological systems and prompt electric-fields in microelectronics.
journal_name
Radiat Prot Dosimetryjournal_title
Radiation protection dosimetryauthors
Emfietzoglou D,Papamichael G,Karava K,Androulidakis I,Pathak A,Phillips GW,Moscovitch M,Kostarelos Kdoi
10.1093/rpd/nci671subject
Has Abstractpub_date
2006-01-01 00:00:00pages
491-6issue
1-4eissn
0144-8420issn
1742-3406pii
nci671journal_volume
119pub_type
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