资源描述：
《mass attenuation coefficient(质量衰减系数)》由会员上传分享，免费在线阅读，更多相关内容在学术论文-天天文库。
1、TablesofX-RayMassAttenuationCoefficientsandMassEnergy-AbsorptionCoefficientsfrom1keVto20MeVforElements Z = 1 to 92and48AdditionalSubstancesofDosimetricInterest*J.H.Hubbell+ and S.M.SeltzerRadiationandBiomolecularPhysicsDivision, PML, NIST©1989,1990,1996copyrightbytheU.S.SecretaryofCommerceonbeh
2、alfoftheUnitedStatesofAmerica.Allrightsreserved.NISTreservestherighttochargeforthesedatainthefuture.AbstractTablesandgraphsofthephotonmassattenuationcoefficient μ/ρ andthemassenergy-absorptioncoefficient μen/ρ arepresentedforalloftheelements Z = 1to92,andfor48 compoundsandmixturesofradiological
3、interest.Thetablescoverenergiesofthephoton(x-ray,gammaray,bremsstrahlung)from1 keVto20 MeV.The μ/ρ valuesaretakenfromthecurrentphotoninteractiondatabaseattheNationalInstituteofStandardsandTechnology,andthe μen/ρ valuesarebasedonthenewcalculationsbySeltzerdescribedinRadiationResearch 136, 147(19
4、93).Thesetablesof μ/ρ and μen/ρreplaceandextendthetablesgivenbyHubbellintheInternationalJournalofAppliedRadiationandIsotopes 33, 1269(1982).NoteonNISTX-rayAttenuationDatabasesTableofContents1.Introduction1.X-RayMassAttenuationCoefficientsTable1. Materialconstantsfor elementalmedia.Table2. Mater
5、ialconstantsandcompositionfor compoundsandmixtures.Valuesofthemassattenuationcoefficientandthemassenergy-absorptioncoefficientasafunctionofphotonenergy,for:Table3. [Data] elementalmedia.Table4. [Data] compoundsandmixtures.2.TheMassEnergy-AbsorptionCoefficient3.Summary4.ReferencesX-RayMassAttenu
6、ationCoefficients1.IntroductionThemassattenuationcoefficient, μ/ρ,andthemassenergy-absorptioncoefficient, μen/ρ,arebasicquantitiesusedincalculationsofthepenetrationandtheenergydepositionbyphotons(x-ray, γ-ray,bremsstrahlung)inbiological,shieldingandothermaterials.Thesecoefficientsaredefinedin I
7、CRUReport 33 (1980)andarediscussedinSections 2and3ofthiswork.Theyhavebeentreatedinsomedetailelsewhere,forexamplebyBerger (1961), Allison (1961), Evans (1968), HubbellandBerger (1968), Hubbell (1969,1977,1982), StormandIsrael (1970
