|Program name||Package id||Status||Status date|
|Package ID||Orig. computer||Test computer|
|IAEA1388/06||Linux-based PC,PC Windows|
FOTELP-2014 is a new compact general purpose version of the previous FOTELP-2K6 code designed to simulate the transport of photons, electrons and positrons through three-dimensional material and sources geometry by Monte Carlo techniques, using subroutine package PENGEOM from the PENELOPE code under Linux-based and Windows OS. This new version includes routine ELMAG for electron and positron transport simulation in electric and magnetic fields, RESUME option and routine TIMER for obtaining starting random number and for measuring the time of simulation.
Physical rigor is maximized by employing the best available cross sections and high speed routines for random values sampling from their distributions, and the most complete physical model for describing the transport and production of the photon/electron/positron cascade from 100.0 MeV down to 1.0 keV. FOTELP-2014 is developed for numerical experiments by Monte Carlo techniques for dosimetry, radiation damage, radiation therapy and other actual applications of these particles.
For the photon history, the trajectory is generated by following it from scattering to scattering using corresponding inverse distribution between collision, types of target, types of collisions, types of secondaries, their energy and scattering angles. Photon interactions are coherent scattering, incoherent scattering, photoelectric absorption and pair production. Doppler broadening in Compton scattering are taken.. The histories of secondary photons include bremsstrahlung and positron-electron annihilation radiation. The condensed history Monte Carlo method is used for the electron and positron transport simulation. During a history the particles lose energy in collisions, and the secondary particles are generated on the step according to the probabilities for their occurrence. Electron (positron) energy loss is through inelastic electron-electron (e-, e-) and positron-electron (e+, e-) collisions and bremsstrahlung generation. The fluctuation of energy loss (straggling) is included according to the Landau's or Blunk-Westphal distributions with 9 gaussians. The secondary electrons, which follow history of particles, include knock-on, pair production, Compton and photoelectric electrons. The secondary positrons, which follow pair production, are included, too. With atomic data, the electron and positron Monte Carlo simulation is broadened to treat atomic ion relaxation after photo-effect and impact ionization. Flexibility of the codes permits them to be tailored to specific applications and allows the capabilities of the codes to be extended to more complex applications, especially in radiotherapy in voxelized geometry using CT data.
Running time largely depends on simulation intention, type of particle, if simulation includes electric and/or magnetic field, on the number of histories to be simulated, on kind of initial and cut-off energies of particles, and on considered geometry. The adopted parameters (energy cut-offs, geometry zones, etc.) also have an influence on the computing time.
For the cross-section generating, probabilities and inverse distributions calculation by FEPDAT or FEPFOT code, on Pentium IV with 1.67 MHz and 1 GB RAM, execution time is about five seconds for one material. For example, a pencil beam depth-dose distribution of 20 MeV electrons incident on a water phantom by simulation of 100,000 histories can be obtained with a running time of about 4.6 minutes on the same computer
The FEPFOT interactive program for generating input files FEPDAT.INP and FOTELP.INP; the program FEPDAT for generating probabilities distributions of photons, electrons and positrons; the PREGRAF program for 2D and 3D imaging data preparation; VoxView for 3D dose presentation and GVIEW2D and GVIEW3D, and PENTEST and PENVIEW programs for viewing and debugging the geometry input files.
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F.Salvat, J.M. Fernandez-Varea, and J.Sempau:
PENELOPE-2011, A Code System for Monte Carlo Simulation of Electron and Photon Transport
Workshop Proceedings Barcelona, Spain 4-7 July 2011, NEA/NSC/DOC(2011)5
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Keywords: 3D dose, 3D source, Monte Carlo method, electric fields, electrons, magnetic fields, photons, positrons, radiotherapy, three-dimensional.