THE EGS5 CODE SYSTEM

Table C.7: ELEM option input data lines in PEGS, part 1.Line and format Variables CommentsELEM1 (4A1) OPT(1:4) ‘ELEM’. Means “select material that is an element.”ELEM2 NAMELIST RHO Optional. If given, this overrides the PEGS defaultdensity (g/cm 3 ) for the element.WA(1) Optional. Atomic weight of element. If given, thisoverrides the PEGS default.IRAYL Optional. Set to 1 (or 2, which requires additionaldata, see below) to model Rayleigh scattering. (default=0,ignore).IUNRST Optional. For printing stopping powers (default = 0,restricted stopping powers, for EGS runs).1 unrestricted collision only2 unrestricted collision and radiative3 unrestricted collision, restricted radiative. 4 restricted collision, unrestricted radiative5 unrestricted radiative only6 restricted radiative only7 restricted collision onlyIAPRIMISSBEPSTFLFUDGEMSIBOUNDOptional. For correction to bremsstrahlung cross section.Default (=1), normalizes integrated cross sectionto ICRU-37 radiative stopping power; set to 0uses Motz et al.empirical; set to 2 uses no correction.Optional. Set to 1 to use user-supplied density effectparameters (see below).Optional. Set to 1 to use user-supplied density effectcorrections (see below).Optional. Constant in Z(Z + ξ MS ) which describesthe contribution of soft electron collisions to multiplescattering (default = 1.0).Optional. Set to 1 to use bound total Compton crosssection (default = 0, use free Compton cross section).INCOHICPROFOptional. Set to 1 to use incoherent scattering functionto model electron binding effect on Comptonscattering angles (default = 0, ignore).Optional. Set to 3,4,-3 or -4 (see below) to use shellwiseCompton profiles to get Compton scattering energies.(default = 0, ignore).372