DOSXYZnrc Users Manual. BEAM Code System General Licence. The BEAM code system (i.e. all pieces of code saying they are subject to the BEAM. General . Epp (Easy particle propagation) is a user code for the EGSnrc code system (1) widely used DOSXYZnrc (2). DOSXYZnrc Users Manual. DOSXYZnrc用户手册_IT/计算机_专业资料。DOSXYZnrc Users Manual B. Walters, I. Kawrakow and D.W.O. Rogers Ionizing Radiation.
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Note that the EGSnrc transport parameter input routine is coded in such a way that, if you are editing the.
If this input is set to Off the mamualthen the Klein-Nishina formula is used to determine crosssections for Compton scattering. Note, this option disabled, but must enter blank record for compatibility.
In a polar coordinate system, this angle is known as the polar uswr and normally has a range degrees. Set to 0 to disable this option. Only of interest at low energies, where the NRC crosssections take into account the assymmetry in the positron-electron energy distribution.
Surviving photons have their weight increased by n split so that their weight is equal to the weight of the original photon before splitting. Dummy input used to be estepe, max.
Air dose will not be zeroed in the. NRCYCL is not automatically calculated if you are only using the positrons in the phase space source or if you are selecting a sub-set of the phase space source based on LATCH settings. The possible settings of mode are: For the time being, please refer to the original article on these new sources for more details: For example, in the BEAMnrc simulation, bit 10 may be associated with a square applicator, so any particle in the phase space?
However, if a large portion of the source is covered on the second pass, or if it is restarted more than once, we recommend re-running the simulation with a new value of NRCYCL calculated as: This is not a cause for concern, because we have found  that in the cases we studied, the underestimate is not signi? Note that, in most applications, we have not observed any di? It should also be noted that this parameter cannot be used as a beam de?
However, the user may set this to correspond to any of the media that they have de? Same as for source 9 Section 4. Dummy input used to be max. The format follows that of the general purpose EGSnrc user-codes.
You can also use your own customized photon cross-section data. Note that the Norej option cannot be used on a region-by-region basis. If set to BH, then use Bethe-Heitler pair production cross-sections. A particle history is terminated if it is determined that the particle will not make it to the phantom surface the particle loses all its energy in the surrounding region or it escapes through the outer boundaries of the surrounding region. Parallel Rectangular Beam Incident from Any Direction This uniform parallel rectangular beam may be incident from any direction.
Recall that when entering the input parameter the beam code, specifying the BEAM simulation to use, you simply use BEAM accelname, omitting the lib pre? If set to BH the defaultthen Bethe-Heitler cross sections are used.
Restarting is not recommended, however, because it may lead to underestimates of the uncertainty in the? One should be careful with the use of this parameter because particles outside the speci? There is also a parameter called ISMOOTH which can be set to 1 if one wants to shift the particles to their symmetrical positions with respect to x- and y-axis in the phase-space?
Currently, medsur, dflag and dsurround In many cases, the user may wish to? This can usually be arranged by making the splitting?
A graphical user interface for calculation of 3D dose distribution using Monte Carlo simulations
In order to reduce the systematic uncertainties due to a small data set, DOSXYZnrc can redistribute the phase-space particles as long as the simulated linear accelerator geometry is symmetric, and the treatment?
For therapy beams, ECUT can be quite high since low-energy electrons contribute little to dose dosxyzrc phantom. Simulation through moving MLC with multiple variable settings A new dowxyznrc contributed by Lobo and Popescu to model continuously varying beam con? In the particular example shown in this?
When n split is used with a phase space or BEAMnrc simulation source, then contaminant electrons may compromise dose statistics because they are fewer and will have a higher weight than the split photons which contribute most of the dose. The following is a description of some of the? This ensures energy is transported and deposited in the correct region although for electrons dksxyznrc are moving isotropically, this can be a very conservative requirement. Note that dsurround is a 4-dimensional array with dsurround 1 occurring before dflag on the input line and dsurround Instead, each parallel job outputs a binary.
For the purposes of dose deposition, the total curved charged dodxyznrc step is approximated by two straight-line steps joined at a hinge point. Below is a description of the 4 types of bit? The default value of 0.
Otherwise, a default luxury level of 1 will be used. Russian roulette is played on all scattered photons with a survival probability 1 of n split.