Designation:E2926−13StandardTestMethodforForensicComparisonofGlassUsingMicroX-rayFluorescence(µ-XRF)Spectrometry1ThisstandardisissuedunderthefixeddesignationE2926;thenumberimmediatelyfollowingthedesignationindicatestheyearoforiginaladoptionor,inthecaseofrevision,theyearoflastrevision.Anumberinparenthesesindicatestheyearoflastreapproval.Asuperscriptepsilon(´)indicatesaneditorialchangesincethelastrevisionorreapproval.INTRODUCTIONOneobjectiveofaforensicglassexaminationistocompareglassspecimenstodetermineiftheycanbediscriminatedusingtheirphysical,opticalorchemicalproperties(forexample,color,refractiveindex(RI),density,elementalcomposition).Ifthespecimensaredistinguishable,exceptforacceptableandexplainablevariations,inanyoftheseobservedandmeasuredproperties,itmaybeconcludedthattheydidnotoriginatefromthesamesourceofbrokenglass.Ifthespecimensareindistinguishableinalloftheseobservedandmeasuredproperties,thepossibilitythattheyoriginatedfromthesamesourceofglasscannotbeeliminated.TheuseofanelementalanalysismethodsuchasmicroX-rayfluorescencespectrometry(µ-XRF)yieldshighdiscriminationamongsourcesofglass.1.Scope1.1Thistestmethodisforthedeterminationofmajor,minor,andtraceelementspresentinglassfragments.Theelementalcompositionofaglassfragmentcanbemeasuredthroughtheuseofµ-XRFanalysisforcomparisonsofglass.1.2Thistestmethodcoverstheapplicationofµ-XRFusingmono-andpoly-capillaryoptics,andanenergydispersiveX-raydetector(EDS).1.3Thistestmethoddoesnotreplaceknowledge,skill,ability,experience,education,ortrainingandshouldbeusedinconjunctionwithprofessionaljudgment.1.4ThevaluesstatedinSIunitsaretoberegardedasstandard.Nootherunitsofmeasurementareincludedinthisstandard.1.5Thisstandarddoesnotpurporttoaddressallofthesafetyconcerns,ifany,associatedwithitsuse.Itistheresponsibilityoftheuserofthisstandardtoestablishappro-priatesafetyandhealthpracticesanddeterminetheapplica-bilityofregulatorylimitationspriortouse.2.ReferencedDocuments2.1ASTMStandards:2E177PracticeforUseoftheTermsPrecisionand...
