Detector response calculated with libamtrack compared with data for different solid state detectors

Research output: ResearchPoster

  • Rochus Herrmann
    Rochus HerrmannDenmark
  • Steffen Greilich
    Steffen GreilichDeutsches Krebsforschungszentrum (DKFZ), HeidelbergGermany
  • Leszek Grzanka
    Leszek GrzankaInstitute of Nuclear Physics, Polish Academy of SciencePoland
  • Armin Lühr
  • Niels Bassler
    Niels BasslerDenmark
  • Department of Physics and Astronomy
  • Department of Experimental Clinical Oncology
Dosimetry of heavy charged particles (HCPs) with solid state detectors is challenging due to their LET dependence and the increased LET found near the distal end of a particle trajectory in a pristine or spread out Bragg peak. For prediction of the non-linear dose response, amorphous track models (ATMs) have be employed since the 1960ies. There are, however, many different flavours of ATMs found in literature. The free and open source library LIBAMTRACK [1,2] provides ATM algorithms and offers for the first time the possibility to directly compare various ATM models and algorithms. Combined with Monte Carlo particle transport codes such as FLUKA, Geant4 or SHIELD-HIT, LIBAMTRACK can be used for predictive dose-response calculations of detectors irradiated with ion beams, even for mixed radiation fields.

Here, we compare the relative effectiveness (RE) calculated using LIBAMTRACK for alanine and Gafchromic EBT films with experimental data found in literature and own measured data. Our own data comprises of relative effectiveness measurements for alanine in carbon ions beams. In references [3,4,5] we found RE data for alanine for several ion species. For Gafchromic films we compare with data for protons from [6].

The reported alanine data sets can be divided in a low and high energy regime: in the low energy regime the primary particles stop in the detector whereas in the high energy regime the particle crosses the detector with a negligible change of energy. While for the latter case, the calculations fit the data well given the experimental uncertainties, in the low energy regime we observe deviations up to 14%. The nature of these deviations will be further investigated. The reported data for the films can be reproduced.

References:
[1] The libamtrack project: http://libamtrack.dkfz.org
[2] S. Greilich et al. “Amorphous track models: A numerical comparison study”, Radiat. Meas., in press; doi:10.1016/j.radmeas.2010.05.039
[3] Palmans H. “Effect of alanine energy response and phantom materials on depth dose measurements in ocular proton beams.”, Technol Cancer Res Treat.;2:6;579-86;(2003)
[4] Olsen K.J. and Hansen J.W, “The response of the alanine dosemeter to low energy protons and high energy heavy charged particles.”, Radiat Prot Dosimetry 31(1-4):81-84;(1990)
[5] Waligórski, M.P.R. et al., “The response of the alanine detector after charged-particle and neutron irradiations”, Appl Radiat Isot 40, 923-933;(1989)
[5] Zhao, L. and Das I., “Gafchromic EBT film dosimetry in proton beams” Phys Med Biol, 55(10):291-301, 2010
Original languageEnglish
Publication year9 Nov 2010
Number of pages1
StatePublished - 9 Nov 2010
EventMC 2010 - Stockholm, Sweden
Duration: 9 Nov 201012 Nov 2010

Conference

ConferenceMC 2010
CountrySweden
CityStockholm
Period09/11/201012/11/2010

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