1、STDmBSI BS EN LZb7I-ENGL 2000 Lb24bb7 0820L2b BRITISH STANDARD Non-destructive testing - Determination of the size of industrial radiographic sources - Radiographic method The European standard EN 126791999 has the status of a Britjshstaridard ICs 19.100 Il7 m BS EN 126792000 NO COPYING WITHOUT BS1
2、PERMISSION EXCEPT AS PEBMI“ED BY COPYRIGBT LAW STD-BSI BS EN L2b79-ENGL 2000 II lb2lbbl 0820327 353 BS EN 12679:2000 direction of the Engineering Amd.No. Date Sector Committee, was published under the authority of the Standards Committee and comes into effect on 15 January ZOO0 O BSI 01-2oOO Nationa
3、l foreword Comments This British Standard is the Engiish language version of EN 126791999. The UK participation in its preparation was entrusted to Technical Committee WEW46, Nondestructive testing, which has the responsibility to: - aid enquirers to undemtand the text; - present to the responsible
4、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 obtained on request to its secret
5、ary. 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 entitled “International Standards Correspondence Index“, or by using the “Find“ facility of the BSI Standards
6、Eleclronic Catalogue. A British Standard does not purport to include all the necessary provisions of a contract. Users of British Standards are responsible for their correct application. Compliance with a British Standard does not of itself confer immunity from legal obligations. Summary of pages Th
7、is document comprises a front cover, an inside front cover, the EN title page, pages 2 to 4, an inside back cover and a back cover. The BSI copyright notice displayed in this document indicates when the document was last issued. ISBN O 580 35225 O EN 12679 October 1999 NondestmictnTe testing- Detmni
8、mtion of the size of in- radiographic sources- Radiographic method This European Standard was approved by CEN on 3 September 1999. CEN members are bound to comply with the CENKENELEC Intemal Regdations which stipuiate the conitions for giving this European Standard the status of a national standard
9、without any aitrafion. Up-tcxM lists and bibiognphid references concerning such donai standards may be obtained on appidon to the Central f+xn the gamma me shall be placed on the axbbetween the X-ray source and the Nm; the gamma source to nIm distance b sha be 10% to 20% of thex-ray source tonlm dis
10、tance a +b; see Figure 1. - I iI I I 2 d a+b magnifying factor m d = a Key 1 X-raytube 2 gammasource:aized 3 image of gamma BOW projected size d 4nIm Figure 1 - Test alignment Q BSI 01-2000 3.2 Test parameters An image of radiation source that has sufficient contrast tobe easilymeasured shall be obt
11、ained. 3.3 Test application The X-rays should be switched on immaly after the amival of the gamma source in the exposure position and switched of again simuaeo c) focal spot size of the X-ray equipment, in millimetxes; d) magnification factor used (see Figure 1); e) technique used f) parametem of X-
12、ray equipment; g) filmscreen-system or radioscopic system, respectivelx h) distances a, b and exposure time t; i) source size d, in millimetres; j) date of the measurement; k) name of test organization; 1) signature of tester. O BSI 01-2000 BS EN 126792000 BSI 389 Chiswick High Road London w4 4AL ST
13、D-BSI BS EN 32b79-ENGL 2000 I Lb2Libb 0820332 510 m BSI - British Standards Institution BSI is the independent national body responsible for preparing British Standards. It presents the UK view on standards in Europe and at the international level. It is incorporated by Royal Charter. Revisions Brit
14、ish Standards are updated by amendment or revision Users of British Standards should make sure that they possess the latest amendments or editions. It is the constant aim of BSI to improve the quahty of our products and services. We would be grateful if anyone finding an inaccuracy or ambiguity whil
15、e using this British Standard would inform the Secretary of the technical committee responsible, the identity of which can be found on the inside fiont cover. Tel 020 8996 9. Fax: 020 8996 7400. BSI offers members an individual updating service called PLUS which ensures that subscribers automaticall
16、y receive the latest eitions of standards. Buying standards Orders for all BSI, international and foreign standards publications should be addressed to Customer Services. Tel: 020 8996 9001. Fax: 020 8996 7001. In response to orders for intemational standards, it is BSI policy to supply the BSI impl
17、ementation of those that have been published as British Standards, unless otherwise requested. Information on standards BSI provides a wide range of information on nationai, European and international standards through its Library and its Technid Help to Exportem Service. Various BSI electronic info
18、rmation services are also available which give details on all its products and services. Contact the Informaion Centre. Tel 020 8996 71 11. Fax: 020 8996 7048. Subscribing members of BSI are kept up to date with standards developments and receive substantial discounts on the purchase price of standa
19、rds. For details of these and other benefits contact Membership Administsation. Tel 020 8996 7002. Fax: 020 8996 7001. Copyright Copyright subsists in all BSI publications. BSI ah holds the copyright, in the UK, of the publications of the internaionai standardkation bodies. Except as permitted under
20、 the Copyright, Designs and Patents Act 1988 no exh-act may be reproduced, stored in a retrieval system or transmitted in any form or by any means - electronic, photocopying, recording or otherwise - without prior written permission from BSI. This does not preclude the free use, in the course of imp
21、lementing the standard, of necessary details such as symbols, and size, type or grade designahom. If these details are to be used for any other purpose than implementation then the prior written permission of BSI must be obtained. If permission is granted, the terms may include royalty payments or a licensing agreement. Details and advice can be obtained from the Copyright Manager. Tel 020 8996 7070.
