ASTM_E_2023_-_10_2014.pdf

Designation:E202310(Reapproved 2014)Standard Practice forFabrication of Neutron Radiographic Sensitivity Indicators1This standard is issued under the fixed designation E2023;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 practice covers the fabrication of Sensitivity Indi-cators(SI),which can be used to determine the relative qualityof radiographic images produced by direct,thermal neutronradiographic examination.1.2 The values stated in inch-pound units are regarded to bestandard.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:2E543 Specification for Agencies Performing NondestructiveTestingE545 Test Method for Determining Image Quality in DirectThermal Neutron Radiographic ExaminationE748 Practices for Thermal Neutron Radiography of Mate-rialsE1316 Terminology for Nondestructive Examinations3.Terminology3.1 DefinitionsFor definitions of terms used in thispractice,see Terminology E1316,Section H.4.Summary of Practice4.1 The Sensitivity Indicator(SI)is used for qualitativedetermination of the sensitivity of detail visible on the neutronradiograph.It consists of a step wedge containing gaps andholes of known dimensions.Visual inspection of the image ofthis device provides subjective information regarding totalradiographic sensitivity with respect to the step-block material,as well as optional subjective data,regarding detrimental levelsof gamma exposure.4.2 Neutron radiography practices are discussed in PracticesE748.The neutron radiograph used to determine image qualityusing the SI shall meet the requirements of Method E545.5.Significance and Use5.1 The only truly valid image quality indicator is a materialorcomponent,equivalenttothepartbeingneutronradiographed,with a known standard discontinuity,inclusion,omission or flaw(reference standard comparison part).The SIis designed to substitute for the reference standard,providingqualitative information on hole and gap sensitivity in a singleunit.Fabrication in accordance with this practice is vital foraccurate and consistent measurements.5.2 This practice shall be followed for the fabrication of allSIs to be used with Method E545 to determine image quality indirect thermal neutron radiography.6.Basis of Application6.1 Qualification of Nondestructive AgenciesIf specifiedin the contractual agreement,NDT agencies shall be qualifiedand evaluated as described in Practice E543.The applicableedition of Practice E543 shall be specified in the contractualagreement.6.2 Procedures and TechniquesThe procedures and tech-niques to be utilized shall be as described in this practice unlessotherwise specified.Specific techniques may be specified in thecontractual agreement.6.3 Reporting Criteria/Acceptance CriteriaReporting cri-teria for the examination results shall be in accordance withSections 9 and 10 unless otherwise specified.Acceptancecriteria,for example,reference radiographs,shall be specifiedin the contractual agreement.6.4 Reexamination of repaired/reworked items is not ad-dressed in this practice and,if required,shall be specified in thecontractual document.7.Sensitivity Indicator(SI)7.1 The Sensitivity Indicator(SI)shall be constructed ofcast acrylic resin,lead(optional),and aluminum.The construc-tion and dimensions are shown in Fig.1.1This practice is under the jurisdiction of ASTM Committee E07 on Nonde-structive Testing and is the direct responsibility of Subcommittee E07.05 onRadiology(Neutron)Method.Current edition approved Oct.1,2014.Published November 2014.Originallyapproved in 1999.Last previous edition approved in 2010 as E2023-10.DOI:10.1520/E2023-10R14.2For 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 7.2 The optional lead step in the SI may be replaced with ablank,cast acrylic resin step.The lead provides a visualindication of beam gamma content;however,the lead image isnot used for any of the SI calculations of Method E545.7.3 The acrylic resin shall be methylmethacrylate.7.4 All dimensional tolerances are as noted on the figures.7.5 Aluminum shims and strips shall be 99.9%pure el-emental material.7.6 The SI may be encased in a 6061 aluminum dust cover,0.012-in.thick.7.7 When used,the optional lead shim shall be at least99.9%pure element