1、BSI Standards PublicationBS EN ISO 19232-4:2013Non-destructive testing Image quality of radiographsPart 4: Experimental evaluation of imagequality values and image quality tables (ISO19232-4:2013)BS EN ISO 19232-4:2013 BRITISH STANDARDNational forewordThis British Standard is the UK implementation o
2、f EN ISO19232-4:2013. It supersedes BS EN 462-4:1995 which is withdrawn.The UK participation in its preparation was entrusted to TechnicalCommittee WEE/46, Non-destructive testing.A list of organizations represented on this committee can beobtained on request to its secretary.This publication does n
3、ot purport to include all the necessaryprovisions of a contract. Users are responsible for its correctapplication. The British Standards Institution 2013. Published by BSI StandardsLimited 2013ISBN 978 0 580 75216 2ICS 19.100Compliance with a British Standard cannot confer immunity fromlegal obligat
4、ions.This British Standard was published under the authority of theStandards Policy and Strategy Committee on 31 July 2013.Amendments issued since publicationDate Text affectedEUROPEAN STANDARD NORME EUROPENNE EUROPISCHE NORM EN ISO 19232-4 June 2013 ICS 19.100 Supersedes EN 462-4:1994English Versio
5、n Non-destructive testing - Image quality of radiographs - Part 4: Experimental evaluation of image quality values and image quality tables (ISO 19232-4:2013) Essais non destructifs - Qualit dimage des radiogrammes - Partie 4: valuation exprimentale des indices de qualit dimage et des tables de qual
6、it dimage (ISO 19232-4:2013) Zerstrungsfreie Prfung - Bildgte von Durchstrahlungsaufnahmen - Teil 4: Experimentelle Ermittlung von Bildgtezahl und Bildgtetabellen (ISO 19232-4:2013) This European Standard was approved by CEN on 15 May 2013. CEN members are bound to comply with the CEN/CENELEC Intern
7、al Regulations which stipulate the conditions for giving this European Standard the status of a national standard without any alteration. Up-to-date lists and bibliographical references concerning such national standards may be obtained on application to the CEN-CENELEC Management Centre or to any C
8、EN member. This European Standard exists in three official versions (English, French, German). A version in any other language made by translation under the responsibility of a CEN member into its own language and notified to the CEN-CENELEC Management Centre has the same status as the official vers
9、ions. CEN members are the national standards bodies of Austria, Belgium, Bulgaria, Croatia, Cyprus, Czech Republic, Denmark, Estonia, Finland, Former Yugoslav Republic of Macedonia, France, Germany, Greece, Hungary, Iceland, Ireland, Italy, Latvia, Lithuania, Luxembourg, Malta, Netherlands, Norway,
10、Poland, Portugal, Romania, Slovakia, Slovenia, Spain, Sweden, Switzerland, Turkey and United Kingdom. EUROPEAN COMMITTEE FOR STANDARDIZATION COMIT EUROPEN DE NORMALISATION EUROPISCHES KOMITEE FR NORMUNG Management Centre: Avenue Marnix 17, B-1000 Brussels 2013 CEN All rights of exploitation in any f
11、orm and by any means reserved worldwide for CEN national Members. Ref. No. EN ISO 19232-4:2013: EBS EN ISO 19232-4:2013EN ISO 19232-4:2013 (E) 3 Foreword This document (EN ISO 19232-4:2013) has been prepared by Technical Committee ISO/TC 135 “Non-destructive testing“ in collaboration with Technical
12、Committee CEN/TC 138 “Non-destructive testing” the secretariat of which is held by AFNOR. This European Standard shall be given the status of a national standard, either by publication of an identical text or by endorsement, at the latest by December 2013, and conflicting national standards shall be
13、 withdrawn at the latest by December 2013. Attention is drawn to the possibility that some of the elements of this document may be the subject of patent rights. CEN and/or CENELEC shall not be held responsible for identifying any or all such patent rights. This document supersedes EN 462-4:1994. Acc
14、ording to the CEN-CENELEC Internal Regulations, the national standards organizations of the following countries are bound to implement this European Standard: Austria, Belgium, Bulgaria, Croatia, Cyprus, Czech Republic, Denmark, Estonia, Finland, Former Yugoslav Republic of Macedonia, France, German
15、y, Greece, Hungary, Iceland, Ireland, Italy, Latvia, Lithuania, Luxembourg, Malta, Netherlands, Norway, Poland, Portugal, Romania, Slovakia, Slovenia, Spain, Sweden, Switzerland, Turkey and the United Kingdom. Endorsement notice The text of ISO 19232-4:2013 has been approved by CEN as EN ISO 19232-4
16、:2013 without any modification. BS EN ISO 19232-4:2013ISO 19232-4:2013(E) ISO 2013 All rights reserved iiiContents PageForeword iv1 Scope . 12 Terms and definitions . 13 Experimental evaluation of image quality values 14 Determination of image quality tables 2Bibliography 3BS EN ISO 19232-4:2013ISO
17、19232-4:2013(E)ForewordISO (the International Organization for Standardization) is a worldwide federation of national standards bodies (ISO member bodies). The work of preparing International Standards is normally carried out through ISO technical committees. Each member body interested in a subject
18、 for which a technical committee has been established has the right to be represented on that committee. International organizations, governmental and non-governmental, in liaison with ISO, also take part in the work. ISO collaborates closely with the International Electrotechnical Commission (IEC)
19、on all matters of electrotechnical standardization.International Standards are drafted in accordance with the rules given in the ISO/IEC Directives, Part 2.The main task of technical committees is to prepare International Standards. Draft International Standards adopted by the technical committees a
20、re circulated to the member bodies for voting. Publication as an International Standard requires approval by at least 75 % of the member bodies casting a vote.Attention is drawn to the possibility that some of the elements of this document may be the subject of patent rights. ISO shall not be held r
21、esponsible for identifying any or all such patent rights.ISO 19232-4 was prepared by the European Committee for Standardization (CEN) in collaboration with ISO Technical Committee TC 135, Non-destructive testing, Subcommittee SC 5, Radiation methods, in accordance with the Agreement on technical coo
22、peration between ISO and CEN (Vienna Agreement).This second edition cancels and replaces the first edition (ISO 19232-4:2004), of which it constitutes a minor revision with the following changes: updated references; correction of Figure 1 and its key.ISO 19232 consists of the following parts, under
23、the general title Non-destructive testing Image quality of radiographs: Part 1: Determination of the image quality value using wire-type image quality indicators Part 2: Determination of the image quality value using step/hole-type image quality indicators Part 3: Image quality classes Part 4: Exper
24、imental evaluation of image quality values and image quality tables Part 5: Determination of the image unsharpness value using duplex wire-type image quality indicatorsiv ISO 2013 All rights reservedBS EN ISO 19232-4:2013INTERNATIONAL STANDARD ISO 19232-4:2013(E)Non-destructive testing Image quality
25、 of radiographs Part 4: Experimental evaluation of image quality values and image quality tables1 ScopeThis part of ISO 19232 gives instructions for the determination of image quality values and image quality tables.If the IQI requirements specified in ISO 19232-3 cannot be used because, for example
26、, the absorption coefficients of the IQI material and the inspected material differ by more than 30 %, test exposures are necessary to determine acceptance of image quality values. The image quality values achieved by the test exposures are required for all exposures made under the same radiographic
27、 conditions.2 Terms and definitionsFor the purposes of this document, the following terms and definitions apply.2.1image quality indicatorIQIdevice comprising a series of elements of graded dimensions which enable a measure of the image quality to be obtainedNote 1 to entry: The elements of IQI are
28、commonly wires or steps with holes.2.2image qualitycharacteristic of a radiographic image which determines the degree of detail which it shows2.3image quality valuemeasure of the image quality required or achieved and is equal to the thinnest element which can be detected on the radiograph2.4image q
29、uality tabletable of minimum required image quality values versus the penetrated thickness ranges3 Experimental evaluation of image quality valuesFor the experimental determination of image quality values, the same radiographic conditions and IQI shall be used as specified for the subsequent examina
30、tion.Two test exposures shall be made under the specified conditions. If the image quality values read from these two exposures are identical, this value shall be accepted as the required image quality value. If the image quality values from the two test exposures are different, the procedure shall
31、be repeated. ISO 2013 All rights reserved 1BS EN ISO 19232-4:2013ISO 19232-4:2013(E)4 Determination of image quality tablesIf different thicknesses of the same material are radiographed, an image quality table shall be established. An example of the image quality values for different penetrated thic
32、knesses is shown in Figure 1. The step curve below the experimental values defines the image quality values and penetrated thickness steps of the image quality table. For an example, see Table 1.KeyA . G image quality valuew penetrated thickness1 interpolated experimental curve2 resulting step curve
33、 corresponding to Table 1image quality determined, material e.g. steelFigure 1 Example for the determination of an image quality tableTable 1 Example of an image quality tablePenetrated thickness w mmImage quality valuew 2 A2 40 G2 ISO 2013 All rights reservedBS EN ISO 19232-4:2013ISO 19232-4:2013(E
34、)Bibliography1 ISO 5579, Non-destructive testing Radiographic testing of metallic materials using film and X- or gamma rays Basic rules ISO 2013 All rights reserved 3This page deliberately left blankThis page deliberately left blankBSI is the national body responsible for preparing British Standards
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