$IAEA_INDEX: 702 // VarianTrueBeam_6MV_01.IAEAphsp : IAEA website: http://www-nds.iaea.org/phsp/photon/ $TITLE: Varian TrueBeam 6MV photon beam, cylindrical patient-independent phase space $FILE_TYPE: 0 $CHECKSUM: 1307564225 $RECORD_CONTENTS: 1 // X is stored ? 1 // Y is stored ? 1 // Z is stored ? 1 // U is stored ? 1 // V is stored ? 1 // W is stored ? 0 // Weight is stored ? 0 // Extra floats stored ? 0 // Extra longs stored ? $RECORD_CONSTANT: 1.0000 // Constant Weight $RECORD_LENGTH: 25 $BYTE_ORDER: 1234 $ORIG_HISTORIES: 1147392000 $PARTICLES: 52302570 $PHOTONS: 51692883 $ELECTRONS: 589933 $POSITRONS: 19754 $TRANSPORT_PARAMETERS: Standard electromagnetic processes including G4UrbanMscModel2 for multiple scattering $MONTE_CARLO_CODE_VERSION: Geant4.9.2.p01 $MACHINE_TYPE: LSF batch system with 1800 multi-core servers. $GLOBAL_PHOTON_ENERGY_CUTOFF: 0.001207 $GLOBAL_PARTICLE_ENERGY_CUTOFF: 0.0001 $COORDINATE_SYSTEM_DESCRIPTION: Cartesian, right-handed: The origin is inside the target bottom, x=y=0 is the central position of the target; Positive x-axis is towards the linac, parallel to the upper jaws movement; Positive z-axis is towards the water phantom or patient; // OPTIONAL INFORMATION $BEAM_NAME: 6MV photon beam stored on a cylindrical surface $FIELD_SIZE: Field-independent, phase space stored above the movable upper jaws. $NOMINAL_SSD: 100 cm $MC_INPUT_FILENAME: Parmela input file with 71,712 particles provided by in-house simulations at Varian; $VARIANCE_REDUCTION_TECHNIQUES: NONE $INITIAL_SOURCE_DESCRIPTION: Parmela Phase Space with a FWHM for the x- and y-coordinates of 1 mm; The FWHM for the x- and y-direction cosines are equal to 0.002; The energy spectrum is non-Gaussian with a peak at 6.13 MeV and a tail extending up to 6.35 MeV. $PUBLISHED_REFERENCE: Phys. Med. Biol. 55, N211-N220 (2010) $AUTHORS: M. Constantin (1), D. Constantin (1), P.J. Keall (1), A. Narula (2), M. Svatos (2), and J. Perl (3) $INSTITUTION: (1) Dept. of Radiation Oncology, Radiation Physics Division, Stanford University, Stanford, CA 94304 (2) Varian Medical Systems, Inc., 3100 Hansen Way, Palo Alto, CA 94304 (3) SLAC National Accelerator Laboratory, Menlo Park, CA 94025 $LINK_VALIDATION: http://iopscience.iop.org/0031-9155/55/8/N03 $ADDITIONAL_NOTES: This is IAEA header as defined in the technical report IAEA(NDS)-0484, Vienna, 2006 $STATISTICAL_INFORMATION_PARTICLES: // Weight Wmin Wmax Emin Emax Particle 5.16929E+07 1 1 1.232 0.001077 6.317 PHOTONS 589933 1 1 0.7595 6.1E-05 6.182 ELECTRONS 19754 1 1 1.165 0.01756 4.719 POSITRONS $STATISTICAL_INFORMATION_GEOMETRY: -30.3716 30.3713 -30 30 17.7671 27.3515