Calculations of absorbed fractions in small water spheres for low-energy monoenergetic electrons and the Auger-emitting radionuclides(123)Iota and (125)Iota
| dc.contributor.author | Bousis, C. | en |
| dc.contributor.author | Emfietzoglou, D. | en |
| dc.contributor.author | Nikjoo, H. | en |
| dc.date.accessioned | 2015-11-24T19:32:01Z | |
| dc.date.available | 2015-11-24T19:32:01Z | |
| dc.identifier.issn | 1362-3095 | - |
| dc.identifier.uri | https://olympias.lib.uoi.gr/jspui/handle/123456789/23351 | |
| dc.rights | Default Licence | - |
| dc.title | Calculations of absorbed fractions in small water spheres for low-energy monoenergetic electrons and the Auger-emitting radionuclides(123)Iota and (125)Iota | en |
| heal.abstract | Purpose: To calculate the absorbed fraction (AF) of low energy electrons in small tissue-equivalent spherical volumes by Monte Carlo (MC) track structure simulation and assess the influence of phase (liquid water versus density-scaled water vapor) and of the continuous-slowing-down approximation (CSDA) used in semi-analytic calculations. Methods: An event-by-event MC code simulating the transport of electrons in both the vapor and liquid phase of water using appropriate electron-water interaction cross sections was used to quantify the energy deposition of low-energy electrons in spherical volumes. Semi-analytic calculations within the CSDA using a convolution integral of the Howell range-energy expressions are also presented for comparison. Results: The AF for spherical volumes of radii from 10-1000 nm are presented for monoenergetic electrons over the energy range 100-10,000 eV and the two Auger-emitting radionuclides (125)I and (123)I. The MC calculated AF for the liquid phase are found to be smaller than those of the (density scaled) gas phase by up to 10-20% for the monoenergetic electrons and 10% for the two Auger-emitters. Differences between the liquid-phase MC results and the semi-analytic CSDA calculations are up to approximately 55% for the monoenergetic electrons and up to approximately 35% for the two Auger-emitters. Conclusions: Condensed-phase effects in the inelastic interaction of low-energy electrons with water have a noticeable but relatively small impact on the AF for the energy range and target sizes examined. Depending on the electron energies, the semi-analytic approach may lead to sizeable errors for target sizes with linear dimensions below 1 micron. | en |
| heal.access | campus | - |
| heal.fullTextAvailability | TRUE | - |
| heal.identifier.primary | 10.3109/09553002.2012.666003 | - |
| heal.identifier.secondary | http://www.ncbi.nlm.nih.gov/pubmed/22348619 | - |
| heal.identifier.secondary | http://informahealthcare.com/doi/abs/10.3109/09553002.2012.666003 | - |
| heal.journalName | Int J Radiat Biol | en |
| heal.journalType | peer-reviewed | - |
| heal.language | en | - |
| heal.publicationDate | 2012 | - |
| heal.recordProvider | Πανεπιστήμιο Ιωαννίνων. Σχολή Επιστημών Υγείας. Τμήμα Ιατρικής | el |
| heal.type | journalArticle | - |
| heal.type.el | Άρθρο Περιοδικού | el |
| heal.type.en | Journal article | en |
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