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,HighEnergyAcceleratorResearchOrganizati on,1-1,Oho,Tsukuba,Ibaraki,305-0801 JapanAbstractThisisthelecturenoteusedatt he\TutorialsforElectron/GammaMonteCarlo: buildingblocksandapplications"aspartofth eInternationalConferenceontheMonteCarlo2 000,AdvancedMonteCarloonRadiationPhysics ,ParticleTransportSimulationandApplicati ons(MonteCarlo2000)heldatLisbonPortugal, 23-26 October, ,absorption,andpairproductionthatarenece ssaryforphotontransportcalculations, [1,2,3,4,5,6]inthis cationofInteractionTheinteractionofphoto nswithmattermaybeclassi , ,electrons,atoms,ornuclei,withwhichtheph otonsinteract, , ,scattering,absorption,pairproduction,et c:, [7]Asanexample, [8]. ect, pe, , C, ,( pair+ trip).Rayleighscattering, R,isusuallyofminorimportanceforthebroadb eamconditionstypi-callyfoundinshielding, butmustbeknownfortheinteractionofattenua tioncoe ect, ph:n,ismostlyrestrictedtotheregionoftheg iantresonancearound10to30 MeVwhere,attheresonancepeak,itmayamountt oasmuchas10percentofthetotal\electronic" ,inelasticnuclearscatteringandDelbr , , eldofanucleusiscalledDelbr uckscattering(alsocallednuclearpotential scattering).
The sum of uorescence yield,!, Auger yield, a, and Coster-Kronig yield, f, is unit y:! + a f =1 (2) Exp erimen tal and theoretical uorescence-yield information ha
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