Designation:E1508−12aStandardGuideforQuantitativeAnalysisbyEnergy-DispersiveSpectroscopy1ThisstandardisissuedunderthefixeddesignationE1508;thenumberimmediatelyfollowingthedesignationindicatestheyearoforiginaladoptionor,inthecaseofrevision,theyearoflastrevision.Anumberinparenthesesindicatestheyearoflastreapproval.Asuperscriptepsilon(´)indicatesaneditorialchangesincethelastrevisionorreapproval.1.Scope1.1Thisguideisintendedtoassistthoseusingenergy-dispersivespectroscopy(EDS)forquantitativeanalysisofmaterialswithascanningelectronmicroscope(SEM)orelectronprobemicroanalyzer(EPMA).Itisnotintendedtosubstituteforaformalcourseofinstruction,butrathertoprovideaguidetothecapabilitiesandlimitationsofthetechniqueandtoitsuse.Foramoredetailedtreatmentofthesubject,seeGoldstein,etal.(1)ThisguidedoesnotcoverEDSwithatransmissionelectronmicroscope(TEM).1.2Units—ThevaluesstatedinSIunitsaretoberegardedasstandard.Nootherunitsofmeasurementareincludedinthisstandard.1.3Thisstandarddoesnotpurporttoaddressallofthesafetyconcerns,ifany,associatedwithitsuse.Itistheresponsibilityoftheuserofthisstandardtoestablishappro-priatesafetyandhealthpracticesanddeterminetheapplica-bilityofregulatorylimitationspriortouse.2.ReferencedDocuments2.1ASTMStandards:2E3GuideforPreparationofMetallographicSpecimensE7TerminologyRelatingtoMetallographyE673TerminologyRelatingtoSurfaceAnalysis(Withdrawn2012)3E691PracticeforConductinganInterlaboratoryStudytoDeterminethePrecisionofaTestMethod3.Terminology3.1Definitions—Fordefinitionsoftermsusedinthisguide,seeTerminologiesE7andE673.3.2DefinitionsofTermsSpecifictoThisStandard:3.2.1acceleratingvoltage—thehighvoltagebetweenthecathodeandtheanodeintheelectrongunofanelectronbeaminstrument,suchasanSEMorEPMA.3.2.2beamcurrent—thecurrentoftheelectronbeammea-suredwithaFaradaycuppositionednearthespecimen.3.2.3Bremsstrahlung—backgroundXraysproducedbyin-elasticscattering(lossofenergy)oftheprimaryelectronbeaminthespecimen.Itcoversarangeofenergiesuptotheenergyoftheelectronbeam.3.2.4c...
