INTERNATIONAL ISO/ASTM STANDARD 51539 Fourth edition 2023-05 Guidance for use of radiation-sensitive indicators Lignes directrices pour I'utilisation d'indicateurs sensibles aux rayonnements Reference number IS0/ASTM 51539:2023(E) INTERNATIONAL @ IS0/ASTM International 2023 IS0/ASTM 51539:2023(E) COPYRIGHTPROTECTEDDOCUMENT @ IS0/ASTM International 2023 All rights reserved. Unless otherwise specified, or required in the context of its implementation, no part of this publication may be reproduced or utilized otherwise in any form or by any means, electronic or mechanical, including photocopying, or posting on the internet or an intranet, without prior written permission. Permission can be requested from either Iso at the address below orIso'smemberbody inthecountryoftherequesterIntheUnited States,suchrequests shouldbe senttoAsTM International. ISO copyright office ASTM International CP 401 : Ch. de Blandonnet 8 100 Barr Harbor Drive, PO Box C700 CH-1214 Vernier, Geneva West Conshohocken, PA 19428-2959, USA Phone:+41227490111 Phone: +610 832 9634 Fax: +610 832 9635 Email: copyright@iso.org Email: khooper@astm.org Website: www.iso.org Website: www.astm.org Published in Switzerland i @ IS0/ASTM International 2023 - All rights reserved