1、STD-BSI BS EN L2543-1-ENGL 1779 Lb2qbb9 0819738 503 12543-1:1999 Non-destructive testing - Characteristics of focal spots in industrial X-ray systems for use in non-destructive testing - Part 1: Scanning method The European Standard EN 12543-1:1999 has the status of a British Standard ICs 19.100 NO
2、COPYING WITHOUT BSI PERMISSION EXCEPT AS PERMITTED BY COPYRIGHT LAW STD*BSI BS EN L2543-L-ENGL 1999 M Lb2VbbS 0817739 44T BS EN 12543-1:1999 direction of the Engineering Sector Committee, was published under the authority of the Standards Committee and comes into effect on 15 December 1999 Amd. No.
3、O BSI 12-1999 National foreword Date Comments This British Standard is the English language version of EN 12543-1:1999. The UK participation in its preparation was entrusted to Technical Committee WEW46, Nondestructive testing, which has the responsibiliQ to: - aid enquirers to understand the text,
4、- present to the responsible European committee any enquiries on the - monitor related international and European developments and promulgate interpretation, or proposals for change, and keep the UK interests informed them in the UK. A list of organizations represented on this committee can be obtai
5、ned on request to its secretary. Cross-references The British Standards which implement international or European publications referred to in this document may be found in the BSI Standards Catalogue under the section entitied “Inkmatioml Standarcis Correspondence Index”, or by using the “Find” faci
6、lity of the BSI Standards Electronic Catalogue. A British Standard does not purport to include ali the necessary provisions of a contract. Usem of British Standards are responsible for their correct application. Compliance with a British Standard does not of itself confer immunity from legal obligat
7、ions. Summary of pages This document comprises a front cover, an inside front cover, the EN title page, pages 2 to 11 and a back cover. The BSI copynght notice displayed in this document indicates when the document was last issued. ISBN O 580 35173 4 EUROPEAN STANDARD NORME EUROPENNE EUROPISCHE NORM
8、 EN 12543-1 September 1999 ICs 19.100 English version Non-destructive testing - Characteristics of focal spots in industrial X-ray systems for use in non-destructive testing - Part I : Scanning method Essais non destructifs - Caractristiques des foyers missifs des tubes radiognes utiliss dans les es
9、sais non destructifs - Partie 1: Mthode par balayage Zerstrungsfreie Prfung - Charakterisierung von Brennflecken in Industrie-Rntgenanlagen fr die zerstrungsfreie Prfung - Teil 1 : Scan-Verfahren This European Standard was approved by CEN on 16 August 1999. CEN members are bound to comply with the C
10、ENKENELEC Internal 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 sich national standards may be obtained on application to the Central Secretariat or to
11、 any CEN member. This European Standard exists in three official versions (English, French, German). A version in any other language made by trmslation under the responsibility of a CEN member into its own language and notified to the Central Secretariat has the same status as tie official versions.
12、 CEN members are the national standards bodies of Austria, Belgium, Czech Republic, Denmark, Finland, France, Germany, Greece, Iceland, Ireland, Italy, Luxembourg, Netherlands, Norway, Portugal, Spain, Sweden, Switzerland and United Kingdom. EUROPEAN COMMITEE FOR STANDARDIZATION COMIT EUROPEN DE NOR
13、MALISATION EUROPISCHES KOMITEE FOR NORMUNG Central Secretariat: rue de Stassart, 36 B-1050 Brussels 8 1999 CEN All rights of exploitation in any form and by any means reserved worldwide for CEN national Members. Ref. No. EN 12543-1:1999 E STDOBSI BS Page 2 EN 12543-1:1999 Contents EN 12543-1-ENGL 27
14、99 Lb2Ybb OTB rn Page Foreword Introduction . . 1 Scope . 2 Terms and definitions 3 Test method . . 4 Measurement and determination of the focal spot size . Annex A (informative) Preferred values of dfor the characterization of X-ray tube types . . . 3 4 4 4 4 5 10 O BSI 12-1999 Page 3 EN 12543-1 19
15、99 Foreword This European Standard has been prepared by Technical 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 la
16、test by March 2000, and conflicting national standards shall be withdrawn at the latest by March 2000. According to the CENKENELEC Internal Regulations, the national standards organizations of the following countries are bound to implement this European Standard: Austria, Belgium, Czech Republic, De
17、nmark, Finland, France, Germany, Greece, Iceland, Ireland, Italy, Luxembourg, Netherlands, Norway, Portugal, Spain, Sweden, Switzerland and the United Kingdom. In the framework of its scope, Technical Committee CEN/TC 138 entrusted CENTTC 138MIG 1 “Ionizing Radiation“ with preparing the following st
18、andard: EN 12543-1, Non-destructive testing - characteristics of focal spots in industria/ X-ray systems for use in non- destructive testing - Part 7: Scanning method EN 12543-1 is a part of series of European Standards with the same number; the other parts are the following: EN 12543-2, Non-destruc
19、tive testing - Characteristics of focal spots in industrial X-ray systems for use in non- destructive testing - Part 2: Pinhole camera radiographic method EN 12543-3, Non-destructive testing - Characteristics of focal spots in industrial X-ray systems for use in non- destructive testing - Part 3: Sl
20、it camera radiographic method EN 125434, Non-destructive testing - Characteristics of focal spots in industrial X-ray systems for use in non- destructive testing - Part 4: Edge method. EN 12543-5, Non-destructive testing - Characteristics of focal spots in industrial X-ray systems for use in non- de
21、structive testing - Part 5: Measurement of the effective focal spot size of mini and micro -focus X-ray tubes O BSI 12-1999 Page 4 Introduction EN 12543-1 I999 d mm 0,l to 0,2 0,2 to 0,3 0,3 to 1 ,O 1.0 In order to cover the different requirements for focal spot size measurement, five different meth
22、ods are described in EN 12543-1 to EN 12543-5. h s 10 pm I 15 pm 5 20 pm 20 x (a/ x h (1 ) where a is the distance between the focal spot and the collimator surface (source side) and d is the focal spot size to be measured. The minimum thickness L of the collimators shall be defined such that the me
23、asured signal intensity through the hole shall be at least 1 O0 times larger than the background noise due to the penetration of the collimator material. The roughness Ra of the slit surfaces shall be better than 2 pm, and the flatness and the parallelism better than h15. The material of the metal b
24、locks shall be tungsten or another similar absorbant material. The radiation detector shall work in the X-ray voltage range between 1 O kV and the nominal voltage of the tube to be measured. At the brightest parts of the intensity distribution of the spot the output signal shall have a signal-to-noi
25、se ratio of at least 40 dB, and the output signal shall follow the radiation intensity linearly. Data acquisition and data processing shall be stable to at least f 1 % over the measuring time. The x-y scanning table shall be capable of resolving and reproducing at least h/2. 3.2 Alignments One of th
26、e axes of the x-y scanning table shall be to f 3“ parallel to the axis of the tube assembly. The x-y scanning table plane shall be to f 3“ perpendicular to the main beam of the tube assembly. The distance between the focal spot and the collimators shall be as small as practicable. When deviating fro
27、m figure 1 the direction of the main beam shall be indicated. NOTE If the tube axis is not defined, then the direction of the electron trajectory is used instead. 3.3 Graphic software The graphic software shall offer the possibility of an isodose contour plot (figure 6). Plots according to figures 3
28、 and 5 can give additional information about the radiation intensity distribution, which may be useful for computer tomogra- phy and image processing. 4 Measurement and determination of the focal spot size 4.1 Measurement The dimensions of the focal spot shall be determined from the isodose contour
29、plot (see figure 6) at 10 % of the maximum intensity. 4.2 Determination of the focal spot sire Each focal spot size is described by its size I (length) in the direction of the tube axis and its size w (width) across the X-ray tube. The operating parameters of the X-ray tube shall be recorded. The la
30、rger of these sizes (I or w) shall be used as the “focal spot size d“. A specification of the focal spot size d on the X-ray tube shall refer to this standard. O BSI 12-1999 Page 6 EN 12543-1 : 1999 1 / 3 Key 1 personal computer and data acquisition unit 2 scintilation counter 3 double slit collimat
31、or (h x h x 2 L) 4 precollimator 5 X-ray tube 6 scattered radiation protection Figure 1 - Measuring facility for radiometric determination of the focal spot size (scheme) O BSI 12-1999 Page 7 EN 12543-1 : I999 LEA AD I a TUNGSTEN I X-ray tube 2 scan directions Figure 2 - Measuring facility for radio
32、metric determination of the focal spot sire (example) O BSI 12-1999 STD-BSI BS EN L2543-L-ENGL 1979 9 Lb24bb9 08L9997 5Lb Page 8 EN 12543-1:1999 1.L i O doro rill I I I 0.3 mm 0.C I O o. 1 0.2 dtstance X - Figure 3 - Line scans of a focal spot 8 BSI 12-1999 Page 9 EN 12543-1:1999 1 slit 2 foil (stee
33、l) 3 hidden slit Figure 4 - Double slit collimator (from above) Figure 5 - Graphical interpretation of the intensity distribution of focal spot scans Q BSI 12-1999 Page 10 EN 12543-1:1999 Figure 6 - Isodose contour plot O BSI 12-1999 STD.BSI BS EN L25q3-L-ENGL 1777 m 1b2Ybb7 0819750 O00 m Page 11 EN
34、 12543-1:1999 Annex A (informative) Preferred values of d for the characterization of X-ray tubes Table A.1 - Preferred values of d in millimetres Additionally to d, the dimensions of I and w can be indicated in the same steps. O BSI 12-1999 BS EN 12543-1: 1999 BSI 389 Chiswic, High Roac London w4 4
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