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Test on Bremsstrahlung

Main authors:B. Faddegon, University of California, San Francisco, US.

Short description: Calculation of the bremsstrahlung yield (photon fluence per incident electron, differential in energy) - along the axis of 10-30 MV beams from thick targets of Al and Pb and - from 0-90° of 15 MV beams from thick targets of Be, Al and Pb.

Reference publication: to be added.

Geant4 code: to be added

Geant-val layout: to be added

Reference data: Photon fluence per unit energy per incident electron, and total photon fluence, integrated over energy, per incident electron is experimentally determined at 1 m from the target. Bremsstrahlung yield down to 0.22 MeV was measured on the axis of 10.09, 15.18, 20.28, 25.38, and 30.45 MeV electron beams [1]. In a separate experiment, bremsstrahlung yield down to 0.145 MeV was measured at angles out to 90° for 15.18 MeV electrons incident on thick Be, Al and Pb targets [2].

[1] Bruce A Faddegon, Makoto Asai, Joseph Perl, Carl Ross, Josep Sempau, Jane Tinslay, and Francesc Salvat, “Benchmarking of Monte Carlo simulation of bremsstrahlung from thick targets at radiotherapy energies,” Med. Phys. 35(10):4308-4317, 2008, PMID: 18975676, PMCID: PMC2736754

[2] T. Bortfeld, “An analytical approximation of the Bragg curve for therapeutic proton beams.,” Med. Phys., vol. 24, no. 12, pp. 2024–33, Dec. 1997

Tested EM physics constructors:

  • EMStandard_opt0
  • EMStandard_opt3
  • EMStandard_opt4
  • Livermore
  • Penelope
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Topic revision: r2 - 2018-12-17 - SusannaGuatelli
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