A structure corresponding to the EGSnrc transport threshold energies common block BOUNDS. More...

#include <egs_interface2.h>

Public Attributes
EGS_Float	ecut

EGS_Float	pcut

EGS_Float	ecut_new

EGS_Float	pcut_new

EGS_Float	vacdst

Detailed Description

A structure corresponding to the EGSnrc transport threshold energies common block BOUNDS.

Note that the original BOUNDS common block contains transport threshold energies on a region-by-region basis. To remove this dependence on the geometry (which determines the number of regions), BOUNDS is replaced with a new definition in egs_c_interface2.macros removing the region dependence but introducing ecut_new and pcut_new. To obtain the original functionality of a region-by-region threshold enerty variation, these variables can be set to the desired values each time the transport of a new particle begins and each time a particle enters a new region. The best way to do this is to set up that the ausgab() function is called before a step is taken (i.e. iarg=0) and to set ecut_new or pcut_new to the desired value in ausgab(), if a new region will be entered after the step. In addition, ecut or pcut must be set to the actual value in the current region when the transport of a new particle begins. When the transport of a new particle begins, the function egsStartParticle is called. User codes written in C must provide an implementation of this function. User codes in C++ deriving from EGS_AdvancedApplication must implement the startNewParticle() function. Region-by-region variation of the transport thresholds is not possible in simple C++ applications deriving from EGS_SimpleApplication. Note that when setting transport threshold energies you mist make sure that they are higher then, or equal to, the particle production threshold energies AE (electrons) and AP (photons), otherwise program crashes are likely. AE and AP are the particle production thresholds that are determined by the PEGS data being used. They are available from struct EGS_Thresh for all media in the simulation geometry.