ASTM_E_1735_-_07_2014.pdf

Designation:E173507(Reapproved 2014)Standard Test Method forDetermining Relative Image Quality of IndustrialRadiographic Film Exposed to X-Radiation from 4 to 25MeV1This standard is issued under the fixed designation E1735;the number immediately following the designation indicates the year oforiginal adoption or,in the case of revision,the year of last revision.A number in parentheses indicates the year of last reapproval.Asuperscript epsilon()indicates an editorial change since the last revision or reapproval.1.Scope1.1 This test method covers determination of the relativeimage quality response of industrial radiographic film whenexposed to X-radiation sources having photon energies from 4to 25 MeV.Evaluation of the film is based on the visibility ofholes in a special image quality indicator(IQI).Since resultsfor a given film type may vary,depending on the particularprocessing system and processing conditions used,it is essen-tial to state the exposure parameters and achieved density,processing chemistry,processing cycle,and processing tem-perature.For the purposes of this test method,it is assumed thatall components of the X-ray system are operating properly andare capable of producing a given image quality.This testmethod is not intended to be used for films exposed withCobalt 60 sources or X-ray sources below 4 MeV.1.2 The values stated in either SI or inch-pound units are tobe regarded as the standard.The values given in parenthesesare for information only.1.3 This standard does not purport to address all of thesafety concerns,if any,associated with its use.It is theresponsibility of the user of this standard to establish appro-priate safety and health practices and determine the applica-bility of regulatory limitations prior to use.2.Referenced Documents2.1 ASTM Standards:2E999 Guide for Controlling the Quality of Industrial Radio-graphic Film ProcessingE1025 Practice for Design,Manufacture,and MaterialGrouping Classification of Hole-Type Image Quality In-dicators(IQI)Used for RadiologyE1079 Practice for Calibration of Transmission Densitom-etersE1316 Terminology for Nondestructive ExaminationsE1815 Test Method for Classification of Film Systems forIndustrial Radiography3.Terminology3.1 DefinitionsDefinitions of terms relating to gamma andX-radiology are found in Terminology E1316.4.Significance and Use4.1 This test method provides a test for determining therelative image quality response of radiographic film whenexposed to 4 to 25 MeV X rays as any single component of thetotal X-ray system(for example,screens)is varied.By holdingthe technique parameters(except exposure time)and process-ing parameters constant,the image quality response of radio-graphic film may be evaluated on a relative basis.4.2 Alternately,this test method provides a test for measur-ing the image quality of the X-ray system or any component ofthe system.5.Test Specimen5.1 The test specimen will consist of a 15-cm(6-in.)steelabsorber with a special IQI placed on the radiation(source)side of the absorber.5.1.1 AbsorberThe absorber shall be made of carbon steelor Type 300 stainless steel.The thickness of 15 cm(6 in.)canbe achieved by stacking thinner plates whose length and widthshall be at least 20 by 25 cm(8 by 10 in.).The surface finishof the top and bottom of the absorber shall be a maximum of6.3-m(250-in.)Raground finish.5.1.2 Image Quality IndicatorThe IQI shall be fabricatedof carbon steel or Type 300 stainless steel and shall conform toFig.1.The IQI steps,identified as Plaques A-D,may befabricated separately and then taped together,as shown in Fig.1,using suitable tape to form the array as shown.The tape shallnot cover any of the holes in the IQI.The surface finish of theIQI top and bottom surfaces shall be a maximum of 6.3-m(250-in.)Raground finish.1This test method is under the jurisdiction of ASTM Committee E07 onNondestructive Testing and is the direct responsibility of Subcommittee E07.01 onRadiology(X and Gamma)Method.Current edition approved June 1,2014.Published July 2014.Originally approvedin 1995.Last previous edition approved in 2007 as E1735-07.DOI:10.1520/E1735-07R14.2For referenced ASTM standards,visit the ASTM website,www.astm.org,orcontact ASTM Customer Service at serviceastm.org.For Annual Book of ASTMStandards volume information,refer to the standards Document Summary page onthe ASTM website.Copyright ASTM International,100 Barr Harbor Drive,PO Box C700,West Conshohocken,PA 19428-2959.United States1 6.Radiation Source6.1 The source of radiation shall be an X-ray generatorcapable of operating in any part(or all)of the range from 4 to25 MeV.7.Film Holder and Screens7.1 Film HolderThe film holder shall be a medical-type,hard-backed cassette or a flexible film holder with a vacuum ormechanical means for providing good film-screen contact.NOTE1All plaques identical except hole size and plaque thickness hole:row spacing tolerance 6 0.1 mm(6 0.004 in.),nonaccumulative DimensionA=10 6 0.1 mm(0.395 6 0.004 in.)and Di