THE EGS5 CODE SYSTEM

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Table B.3: Variable descriptions for COMMON block COUNTERS, include file counters.f of the EGS5 distribution. All variables in COMMON block COUNTERS are initialized to 0 by a call to subroutine COUNTERS OUT(0) with argument of 0. IANNIH* IAPHI* IBHABHA* IBREMS* ICOLLIS* ICOMPT* IEDGBIN* IEII* IELECTR* IHARDX* IHATCH* IKAUGER* IKSHELL* IKXRAY* ILAUGER* ILSHELL* ILXRAY* IMOLLER* IMSCAT* IPAIR* IPHOTO* IPHOTON* IRAYLEI* ISHOWER* IUPHI* ITMXS* NOSCAT IBLOCK* Number of times calling subprogram ANNIH. Number of times calling subprogram APHI. Number of times calling subprogram BHABHA. Number of times calling subprogram BREMS. Number of times calling subprogram COLLIS. Number of times calling subprogram COMPT. Number of times calling subprogram EDGBIN. Number of times calling subprogram EII. Number of times calling subprogram ELECTR. Number of times calling subprogram HARDX. Number of times calling subprogram HATCH. Number of times calling subprogram KAUGER. Number of times calling subprogram KSHELL. Number of times calling subprogram KXRAY. Number of times calling subprogram LAUGER. Number of times calling subprogram LSHELL. Number of times calling subprogram LXRAY. Number of times calling subprogram MOLLER. Number of times calling subprogram MSCAT. Number of times calling subprogram PAIR. Number of times calling subprogram PHOTO. Number of times calling subprogram PHOTON. Number of times calling subprogram RAYLEI. Number of times calling subprogram SHOWER. Number of times calling subprogram UPHI. Number of times requested multiple scattering step was truncated in ELECTR because pathlength was too long. Number of times multiple scattering was aborted in MSCAT because the pathlength was too small (Note change in that NOSCAT has been moved here from EGS4 COMMON block MISC). Number of times calling subprogram BLOCK SET. Table B.4: Variable descriptions for COMMON block EDGE2, include file egs5 edge.f of the EGS5 distribution. IEDGFL* Array of flags for turning on (=1) explicit treatment of K and L-edge fluorescent photons (default=0). IAUGER* Array of flags for turning on (=1) explicit treatment of K and L Auger electrons (default=0). 316
Table B.5: Variable descriptions for COMMON block EIICOM, include file egs5 eiicom.f of the EGS5 distribution. IEISPL* Flag for turning on (=1) splitting of x-rays generated by electron-impact ionization (default=0 implies no splitting). NEISPL* Number of electron impact ionization x-rays for splitting when IEISPL=1. Table B.6: Variable descriptions for COMMON block EPCONT, include file egs5 epcont.f of the EGS5 distribution. EDEP Energy deposited in MeV. TSTEP Distance to next interaction (cm). USTEP User (straight line) step length requested and granted. TVSTEP Actual total Multiple scattering step to be transported. (Note that because of the use of the random hinge transport mechanics in EGS5, the EGS4 variables TUSTEP and VSTEP are redundant and so have been removed, as has the variable TSCAT.) RHOF Value of density scaling correction (default=1). EOLD Charged particle (total) energy at beginning of step in MeV. ENEW Charged particle (total) energy at end of step in MeV. EKE Kinetic energy of charged particle in MeV. ELKE Natural logarithm of EKE. BETA2 β 2 for present particle. (Note that EGS4 variable BETA is no longer included.) GLE Natural logarithm of photon energy. IDISC User discard request flag (to be set in HOWFAR). IDISC > 0 means user requests immediate discard, IDISC < 0 means user requests discard after completion of transport, and IDISC = 0 (default) means no user discard requested. IROLD Index of previous region. IRNEW Index of new region. IAUSFL Array of flags for turning on various calls to AUSGAB. 317
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THE EGS5 CODE SYSTEM 1 Hideo Hiraya
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Contents 1 INTRODUCTION 1 1.1 Inten
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2.15.6 Electron Step-Size Selection
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B.4.9 Output of Results (Step 9) .
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List of Figures 2.1 Program flow an
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C.4 Subprogram relationships in PEG
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B.5 Variable descriptions for COMMO
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PREFACE In the nineteen years since
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Chapter 1 INTRODUCTION 1.1 Intent o
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“shower book”. For various reas
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1.2.2 EGS1 About this time Nelson b
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MSCAT. These versions of EGS, PEGS,
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ten for energies less than 100 MeV
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- Molière multiple scattering (i.e
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EGS5. The primary advantages of thi
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ICRU37-compliant using the NIST dat
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high Z materials. Del Guerra et al.
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One of these six cross sections is
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at low energies. The latter, couple
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If E 1 and E 2 are expressions invo
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The result of this algorithm is tha
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2.4 Particle Transport Simulation T
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from appropriate distribution funct
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parameters which may be needed. The
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arrived at their values in a very m
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Math FORTRAN Program Table 2.1 (con
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Figure 2.2: Feynman diagrams for br
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defined by δ ij = 1 if i = j, 0 ot
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Davies, Bethe and Maximon[49] (e.g.
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cross section given in Equation 2.4
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and use this as the variable to be
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we have Now define δ ′ = ∆ C
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This agrees with formula (10) of Bu
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That is, using Equations 2.122 and
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d˘Σ P air, Run−time dE = [ 2 3
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Angular distribution formulas The f
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at either x = 0, x = (πE 0 ) 2 (i.
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The following table, derived from t
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Figure 2.3: Feynman diagrams for tw
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where X 0 = radiation length (cm),
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where α ′ 1 = α ′ 2 = k 0 ′
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+ 1 E 2 ′ − 1 E 1 ′ − C 2 l
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PEGS functions BHABDM, BHABRM, and
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To find the limits of E, we first c
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Figure 2.5: Feynman diagram for sin
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Ī adj = average adjusted mean ioni
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Table 2.2 (cont.) Z Symbol Atomic D
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Table 2.3 (cont.) LABEL a m s x 0 x
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(c) If 10.5 ≤ −C < 11.0 then x
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obtain the real scattering angle. E
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ρ = material mass density (g/cm 3
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Hence, so that ln [1.13 + 3.76(αZ
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g 3 (θ) = θ4 ( ) λf (0) (θ) + f
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Actually, b = 0 does not correspond
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Assume that an electron starts off
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At small path lengths t, a very lar
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x Final Direction φ Θ ∆x t Init
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shown that this version of the rand
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and as we noted earlier, they are d
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Final Direction x Energy Hinges φ
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Transport Steps, ∆ E = E x ESTEPE
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tranport step 1 DEINITIAL1 DERESID1
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= ∆E ( ∣ ∣∣∣ dE −1 ∣
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Since the CSDA range is uniquely de
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short steps accurate, but slow step
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Table 2.4: Materials used in refere
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Average Lateral Displacement (cm) 0
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100 MeV Electrons 0.01 0.001 Li C L
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actions involving photons with ener
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Cu 40 keV Counts (/keV/sr/source) 1
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Table 2.6: Data sources for general
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2.16.2 Photoelectron Angular Distri
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where r 0 is the classical electron
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second term on the right-hand side
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Z θ k Y O φ e 0 X k 0 Figure 2.23
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Note the similarities and differenc
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X Z ω k 0 O e 0 Y Figure 2.25: Dir
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W = Atomic, molecular and mixture w
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In order to use EGS5 to answer the
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write(6,100) 100 FORMAT(’ PEGS5-c
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! plate is 1 mm thick !------------
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implicit none include ’include/eg
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0.989 MeV kinetic energy Brem photo
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! locally (in fact EDEP = particles
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inmax=max(binmax,ebin(j)) end do wr
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0.40 0.0058 * 0.60 0.0054 * 0.80 0.
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!----------------------------------
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endif if(loop.lt.3) then write(6,12
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180 FORMAT(/’ Knock-on electrons
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common/score/escore(3), iscore(3) r
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Brem photons can be created and any
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in any combination of 31 well speci
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end do end do ! nmed and dunit defa
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! ------------------------------ cl
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if (iarg.eq.17) then ! A Compton sc
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! the general purpose geometry subr
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eturn end !------------------------
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open(UNIT= 6,FILE=’egs5job.out’
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write(6,130) 130 format(/’ Start
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icol= * int(dlog10(ebin(j)*10000.0/
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0.0300 0.0000* 0.0320 0.0001* 0.034
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0.0780 0.0014 * 0.0800 0.0012 * 0.0
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The main purpose of this section, h
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4.1.3 Leading Particle Biasing The
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• Sum the weighted energy deposit
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4 z 6 Vac 11 5 Pb 6 5 Air 7 4 9 10
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Figure 4.3: UCBEND simulation at 3.
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necessary geometry input. The follo
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Appendix A EGS5 FLOW DIAGRAMS Hideo
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subroutine annih Version 051219-143
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¡ eq 1 anormr = 1./sqrt(anorm2) si
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1 br = max(br,0.D0) ekse2 = br*ekin
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1 2 3 br = br*p esg = eie*br yes es
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¤ ne ¤ ne subroutine collis (lele
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¦ ne ¦ ne call ausgab(iarg) 6 iq(
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subroutine compt Version 051219-143
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3 4 5 6 icprof(medium) .eq. 3 no ye
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subroutine counters_out Version 051
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1 2 3 4 5 6 7 no ii .ne. jj yes no
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© ne 1 2 3 neispl = (2*neispl + 1)
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subroutine electr(ircode) ielectr =
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7 8 9 10 11 12 13 detot = e(np)-ecu
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2324 25 26 27 28 29 30 ustep .gt. d
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4142 43 44 45 46 47 48 49 ecut(irne
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5859 60 61 62 63 64 tmscat .eq. 0.0
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73 74 75 76 no edep .lt. e(np) yes
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subroutine hardx (charge,kEnergy,ke
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1 2 3 4 5 iz = izz iz .eq. 0 no xsi
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13 14 15 16 17 sint .ne. 0. yes rde
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19 im=1 im=im+1 im >nmed no yes no
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22 23 write(kmpo,1610) read(kmpi,12
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26 27 28 iprofm(im) .ne. 1 no yes w
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30 31 32 33 34 esig0(i,im) = esig0(
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36 37 38 no iedgfl(ii).ne.0 .or. ia
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no kaug .eq. 6 call lshell(3) kaug.
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subroutine kxray Version 051219-143
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1 2 3 dfl3aug(5,iz) .eq. 0. no naug
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1 2 3 4 rnnow .le. omegal2(iz) + f2
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1 2 dflx3(6,iz) .eq. 0. no nxray=nx
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1 impacr(ir(np)).eq.1 .and. iedgfl(
Page 281 and 282: 1 2 fject = (ktot - k1grd(iprt,ik1)
Page 283 and 284: 5 6 7 8 9 thr = 1./eta "Central cor
Page 285 and 286: 1 2 3 delta = delcm(medium)*del "Re
Page 287 and 288: 8 9 10 11 12 galpha .ge. 0.0 yes no
Page 289 and 290: subroutine photo Version 051219-143
Page 291 and 292: 4 5 6 7 8 rnnow .le. pbran(i) no ye
Page 293 and 294: 12 13 14 beta = sqrt((eelec - RM)*(
Page 295 and 296: subroutine photon Version 051219-14
Page 297 and 298: 6 7 8 9 10 idisc .gt. 0 yes no edep
Page 299 and 300: 17 18 19 20 21 iausfl(iarg+1) ne 0
Page 301 and 302: 27 28 iausfl(iarg+1) ne 0 no ircod
Page 303 and 304: subroutine rk1 Version 060313-0945
Page 305 and 306: 4 5 6 j=1 j=j+1 j>neke-1 no yes j .
Page 307 and 308: 18 19 20 21 22 23 elkeold = elke k1
Page 309 and 310: 1 2 "end of file; go to 13" read(17
Page 311 and 312: 4 5 "go to 30" no abs(k1mine-k1grd(
Page 313 and 314: 7 8 read(17,'(72a1)') buffer read(1
Page 315 and 316: subroutine shower (iqi,ei,xi,yi,zi,
Page 317 and 318: subroutine uphi(ientry,lvl) Version
Page 319 and 320: subroutine randomset(rndum) Version
Page 321 and 322: subroutine rluxinit Version 051219-
Page 323 and 324: 1 i=1 i=i+1 i>24 no yes seeds(i) =
Page 325 and 326: subroutine rluxin Version 051219-14
Page 327 and 328: Appendix B EGS5 USER MANUAL Hideo H
Page 329 and 330: Table B.1: Variable descriptions fo
Page 331: Table B.2: Variable descriptions fo
Page 335 and 336: Table B.8: Variable descriptions fo
Page 337 and 338: Table B.12: Variable descriptions f
Page 339 and 340: Optional parameter modifications Th
Page 341 and 342: the call to PEGS5 may be skipped if
Page 343 and 344: egions. Execution of EGS5 is termin
Page 345 and 346: of the transport in the walls of el
Page 347 and 348: call rluxinit after specifying LUXL
Page 349 and 350: END OF FILE ON UNIT 12 PROGRAM STOP
Page 351 and 352: do i=1,ncases uf(1)=ufi vf(1)=vfi w
Page 353 and 354: crossed, then USTEP should be set t
Page 355 and 356: subroutine howfar implicit none inc
Page 357 and 358: Table B.18: IARG values program sta
Page 359 and 360: As an example of how to write an AU
Page 361 and 362: !**********************************
Page 363 and 364: nreg=3 do i=2,nreg ecut(i)=100.0 pc
Page 365 and 366: nlines=0 nwrite=15 !---------------
Page 367 and 368: if (nlines.lt.nwrite) then write(6,
Page 369 and 370: Appendix C PEGS USER MANUAL Hideo H
Page 371 and 372: is entered. On each pass through th
Page 373 and 374: (from previous figure) (to previous
Page 375 and 376: (from previous figure) | | + ------
Page 377 and 378: +------+ |BREMTR| +------+ | V +---
Page 379 and 380: +------+ |PAIRTR| +------+ | V +---
Page 381 and 382: Name DCSLOAD DCSSTOR DCSTAB ELASTIN
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Name AFFACT AINTP ALKE ALKEI ALIN A
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Table C.5: Functions in PEGS, part
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+------+ +------+ +------+ +------+
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Table C.8: ELEM option input data l
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Table C.10: MIXT option input data
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Table C.12: PWLF option input data
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Table C.17: PLTN option input data
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ICPROF is set to 3, the user must c
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Column Line 12345678911234567892123
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interiors of the intervals. If FEXA
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C.3.6 The TEST Option The TEST opti
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C.3.9 The HPLT Option The Histogram
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Appendix D EGS5 INSTALLATION GUIDE
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egs5 directory (preferably using th
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6. The user is then asked to key-in
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* User code tutor1.f has been compi
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Appendix E CONTENTS OF THE EGS5 DIS
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All of the actual FORTRAN source co
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aprime.data Data for empirical brem
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eryllium iron silicon bismuth krypt
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The tutorial problems and advanced
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Bibliography [1] R. G. Alsmiller Jr
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[28] A. F. Bielajew. HOWFAR and HOW
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[59] K. Flöttmann. Investigations
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[92] H. Kolbenstvedt. Simple theory
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[123] Y. Namito, H. Hirayama, A. Ta
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[156] Y. A. Shreider, editor. The M
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Index “shower book”, 37 AE, 28,
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Klein-Nishina formula, 62 Landau di
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