Comparative Dosimetric Estimates of a 25 keV Electron Micro-beam with three Monte Carlo Codes

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The calculations presented compare the different performances of the three Monte Carlo codes PENELOPE-1999, MCNP-4C and PITS, for the evaluation of Dose profiles from a 25 keV electron micro-beam traversing individual cells. The overall model of a cell is a water cylinder equivalent for the three codes but with a different internal scoring geometry: hollow cylinders for PENELOPE and MCNP, whereas spheres are used for the PITS code. A cylindrical cell geometry with scoring volumes with the shape of hollow cylinders was initially selected for PENELOPE and MCNP because of its superior simulation of the actual shape and dimensions of ... continued below

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Mainardi, Enrico; Donahue, Richard J. & Blakely, Eleanor A. September 11, 2002.

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The calculations presented compare the different performances of the three Monte Carlo codes PENELOPE-1999, MCNP-4C and PITS, for the evaluation of Dose profiles from a 25 keV electron micro-beam traversing individual cells. The overall model of a cell is a water cylinder equivalent for the three codes but with a different internal scoring geometry: hollow cylinders for PENELOPE and MCNP, whereas spheres are used for the PITS code. A cylindrical cell geometry with scoring volumes with the shape of hollow cylinders was initially selected for PENELOPE and MCNP because of its superior simulation of the actual shape and dimensions of a cell and for its improved computer-time efficiency if compared to spherical internal volumes. Some of the transfer points and energy transfer that constitute a radiation track may actually fall in the space between spheres, that would be outside the spherical scoring volume. This internal geometry, along with the PENELOPE algorithm, drastically reduced the computer time when using this code if comparing with event-by-event Monte Carlo codes like PITS. This preliminary work has been important to address dosimetric estimates at low electron energies. It demonstrates that codes like PENELOPE can be used for Dose evaluation, even with such small geometries and energies involved, which are far below the normal use for which the code was created. Further work (initiated in Summer 2002) is still needed however, to create a user-code for PENELOPE that allows uniform comparison of exact cell geometries, integral volumes and also microdosimetric scoring quantities, a field where track-structure codes like PITS, written for this purpose, are believed to be superior.

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INIS; OSTI as DE00803851

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  • Other Information: PBD: 11 Sep 2002

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  • Report No.: LBNL--50863
  • Grant Number: AC03-76SF00098
  • DOI: 10.2172/803851 | External Link
  • Office of Scientific & Technical Information Report Number: 803851
  • Archival Resource Key: ark:/67531/metadc740142

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  • September 11, 2002

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  • Oct. 19, 2015, 7:39 p.m.

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  • April 4, 2016, 4:03 p.m.

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Mainardi, Enrico; Donahue, Richard J. & Blakely, Eleanor A. Comparative Dosimetric Estimates of a 25 keV Electron Micro-beam with three Monte Carlo Codes, report, September 11, 2002; Berkeley, California. (digital.library.unt.edu/ark:/67531/metadc740142/: accessed December 15, 2017), University of North Texas Libraries, Digital Library, digital.library.unt.edu; crediting UNT Libraries Government Documents Department.