Designation:E1079−16StandardPracticeforCalibrationofTransmissionDensitometers1ThisstandardisissuedunderthefixeddesignationE1079;thenumberimmediatelyfollowingthedesignationindicatestheyearoforiginaladoptionor,inthecaseofrevision,theyearoflastrevision.Anumberinparenthesesindicatestheyearoflastreapproval.Asuperscriptepsilon(´)indicatesaneditorialchangesincethelastrevisionorreapproval.1.Scope1.1Thispractice2coversthecalibrationoftransmissiondensitometersusedtoperformradiographicfilmdensitymea-surements(seeNote1).1.2Thisstandarddoesnotpurporttoaddressallofthesafetyconcerns,ifany,associatedwithitsuse.Itistheresponsibilityoftheuserofthisstandardtoestablishappro-priatesafetyandhealthpracticesanddeterminetheapplica-bilityofregulatorylimitationspriortouse.NOTE1—Forfurtherinformationonthedesignanduseofdensitometers,thefollowingliteratureissuggestedasadditionalback-groundinformation:ISO5–1:2009,ISO5–2:2009,ISO5–3:2009,andISO14807:2001.2.ReferencedDocuments2.1ASTMStandards:3E1316TerminologyforNondestructiveExaminations2.2ISOStandards:4ISO5–3:2009PhotographyandGraphicTechnology-Den-sityMeasurements-Part3:SpectralConditionsISO14807:2001Photography-TransmissionandReflectionDensitometers-MethodforDeterminingPerformance3.Terminology3.1Definitions—Fordefinitionsoftermsusedinthispractice,seeTerminologyE1316.4.SignificanceandUse4.1Thispracticeprovidesameansforcalibratingtransmis-siondensitometersusedforthemeasurementofradiographicfilmdensity.Atransmissiondensitometercalibratedinaccor-dancewiththispracticeprovidestheassurancethataccuratedensityvaluesofradiographsareobtained.5.Apparatus5.1Apparatusshouldconsistofthefollowing:5.1.1Acalibratedsteptabletcoveringthedensityrangeusedinproductionradiographsshallbeused.ThesteptabletmaybeaNISTX-rayStepTablet(X-RayFilmStepTabletTransmissionDensityStandard38100C)5,oralternatelyasteptabletfromanothersupplierthatistraceabletotheNISTsteptabletintherangeprovidedbyNISTcertification.Thesteptabletshallhaveatleastfivestepdensities,whichcoverthede...
