Designation:B568−98(Reapproved2014)StandardTestMethodforMeasurementofCoatingThicknessbyX-RaySpectrometry1ThisstandardisissuedunderthefixeddesignationB568;thenumberimmediatelyfollowingthedesignationindicatestheyearoforiginaladoptionor,inthecaseofrevision,theyearoflastrevision.Anumberinparenthesesindicatestheyearoflastreapproval.Asuperscriptepsilon(´)indicatesaneditorialchangesincethelastrevisionorreapproval.ThisstandardhasbeenapprovedforusebyagenciesoftheU.S.DepartmentofDefense.1.Scope1.1ThistestmethodcoverstheuseofX-rayspectrometrytodeterminethicknessofmetallicandsomenonmetalliccoatings.1.2Themaximummeasurablethicknessforagivencoatingisthatthicknessbeyondwhichtheintensityofthecharacter-isticsecondaryXradiationfromthecoatingorthesubstrateisnolongersensitivetosmallchangesinthickness.1.3Thistestmethodmeasuresthemassofcoatingperunitarea,whichcanalsobeexpressedinunitsoflinearthicknessprovidedthatthedensityofthecoatingisknown.1.4Problemsofpersonnelprotectionagainstradiationgen-eratedinanX-raytubeoremanatingfromaradioisotopesourcearenotcoveredbythistestmethod.Forinformationonthisimportantaspect,referenceshouldbemadetocurrentdocumentsoftheNationalCommitteeonRadiationProtectionandMeasurement,FederalRegister,NuclearRegulatoryCommission,NationalInstituteofStandardsandTechnology(formerlytheNationalBureauofStandards),andtostateandlocalcodesifsuchexist.1.5Thisstandarddoesnotpurporttoaddressallofthesafetyconcerns,ifany,associatedwithitsuse.Itistheresponsibilityoftheuserofthisstandardtoestablishappro-priatesafetyandhealthpracticesanddeterminetheapplica-bilityofregulatorylimitationspriortouse.2.ReferencedDocuments2.1ASTMStandards:2E135TerminologyRelatingtoAnalyticalChemistryforMetals,Ores,andRelatedMaterials2.2InternationalStandard:ISO3497MetallicCoatings—MeasurementofCoatingThickness—X-raySpectrometricMethods3.Terminology3.1DefinitionsoftechnicaltermsusedinthistestmethodmaybefoundinTerminologyE135.4.SummaryofTestMethod4.1Excitation—Themeasurementofthethicknessofcoat-ingsbyX...
