ISO INTERNATIONAL STANDARD 23547 First edition 2022-05 Measurement of radioactivity - Gamma emitting radionuclides Reference measurement standard specifications for the calibration of gamma-ray spectrometers Mesurage de la radioactivite - Radionucléides émetteurs gamma Caractéristiques des étalons de mesure de reference pour I'étalonnage de spectrometres gamma Reference number IS0 23547:2022(E) ISO @IS02022 IS0 23547:2022(E) COPYRIGHT PROTECTED DOCUMENT @ISO2022 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, withoutpriorwrittenpermission.Permission can berequestedfrom eitherIso at theaddress below orIso'smemberbodyinthecountryoftherequester. ISO copyright office CP 401 · Ch. de Blandonnet 8 CH-1214 Vernier, Geneva Phone: +4122 749 0111 Email: copyright@iso.org Website: www.iso.org Published in Switzerland ii @ IS0 2022 - All rights reserved