Designation:E1165−12(Reapproved2017)StandardTestMethodforMeasurementofFocalSpotsofIndustrialX-RayTubesbyPinholeImaging1ThisstandardisissuedunderthefixeddesignationE1165;thenumberimmediatelyfollowingthedesignationindicatestheyearoforiginaladoptionor,inthecaseofrevision,theyearoflastrevision.Anumberinparenthesesindicatestheyearoflastreapproval.Asuperscriptepsilon(´)indicatesaneditorialchangesincethelastrevisionorreapproval.1.Scope1.1TheimagequalityandtheresolutionofX-rayimageshighlydependonthecharacteristicsofthefocalspot.Theimagingqualitiesofthefocalspotarebasedonitstwodimensionalintensitydistributionasseenfromthedetectorplane.1.2Thistestmethodprovidesinstructionsfordeterminingtheeffectivesize(dimensions)ofstandardandminifocalspotsofindustrialx-raytubes.Thisdeterminationisbasedonthemeasurementofanimageofafocalspotthathasbeenradiographicallyrecordedwitha“pinhole”technique.1.3Thisstandardspecifiesamethodforthemeasurementoffocalspotdimensionsfrom50µmuptoseveralmmofX-raysourcesupto1000kVtubevoltage.SmallerfocalspotsshouldbemeasuredusingEN12543-5usingtheprojectionofanedge.1.4Thistestmethodmayalsobeusedtodeterminethepresenceorextentoffocalspotdamageordeteriorationthatmayhaveoccurredduetotubeage,tubeoverloading,andthelike.Thiswouldentailtheproductionofafocalspotradio-graph(withthepinholemethod)andanevaluationoftheresultantimageforpitting,cracking,andthelike.1.5ValuesstatedinSIunitsaretoberegardedasthestandard.1.6Thisstandarddoesnotpurporttoaddressallofthesafetyconcerns,ifany,associatedwithitsuse.Itistheresponsibilityoftheuserofthisstandardtoestablishappro-priatesafety,health,andenvironmentalpracticesanddeter-minetheapplicabilityofregulatorylimitationspriortouse.1.7Thisinternationalstandardwasdevelopedinaccor-dancewithinternationallyrecognizedprinciplesonstandard-izationestablishedintheDecisiononPrinciplesfortheDevelopmentofInternationalStandards,GuidesandRecom-mendationsissuedbytheWorldTradeOrganizationTechnicalBarrierstoTrade(TBT)Committee.2.ReferencedDocuments2.1A...
