ISO INTERNATIONAL STANDARD 13165-3 First edition 2016-03-01 Water quality - Radium-226 Part 3: Test method using coprecipitation and gamma-spectrometry Qualité de I'eau - Radium 226 - Partie 3: Meéthode d'essai par coprécipitation et spectrométrie gamma Reference number ISO 13165-3:2016(E) ISO International Organization for Standardization =ZHEJIANG INST OF STANDARDIZATION C1 5956617 @IS02016 itted without license from IHS IS0 13165-3:2016(E) COPYRIGHT PROTECTED DOCUMENT IS0 2016, Published in Switzerland All rights reserved. Unless otherwise specified, no part of this publication may be reproduced or utilized otherwise in any form written permission. Permission can be requested from either ISO at the address below or ISO's member body in the country of the requester. ISO copyright office Ch. de Blandonnet 8 . CP 401 CH-1214 Vernier, Geneva, Switzerland Tel. +41 22 749 01 11 Fax +41 22 749 09 47 copyright@iso.org www.iso.org Internatinir DrganizationforStandardization Licensee-ZHEJIANG INST.OF STANDARDIZoISQ6 -All rights reserved Not for Resale, 2016/4/26 03:01:45 No reproduction or networking permited without license from IHS IS0 13165-3:2016(E) Contents Page Foreword ..iv Introduction. ..V 1 Scope. ..1 2 Normative references 3 Terms and definitions 4 Symbols. ..2 5 Principle of the measurement 3 6 Reagents and equipment ..3 6.1 Reagents. ..3 6.2 Equipment .4 7 Sampling. 7.1 Sample collection ..4 7.2 Sample transport and storage. ..4 8 Procedures ..4 8.1 Blank sample preparation 4 8.2 Sample preparation .5 8.3 Counting procedure. ..5 9 Quality assurance and quality control programme .5 9.1 General. 5 9.2 Influence quantities.. .6 9.3 Instrument verification. ..6 9.4 Method verification. 6 9.5 Demonstration of analyst capability .6 10 Expression of results .6 10.1 General 6 10.2 Water-soluble 226Ra activity concentration .7 10.3 Standard uncertainty of activity concentration 7 10.4 Decision threshold. ..7 10.5 Detection limit .7 10.6 Limits of the confidence interval. .8 10.7 Corrections for contributions from other radionuclides and background ..8 10.7.1 General ..8 10.7.2 Contribution from other radionuclides 10.7.3 Contribution from background ..10 11 Expression of results. ..10 Annex A (informative) Uranium and its decay chain. ..12 Bibliography .14 ii icensee=ZHEJIANG INST OF STANDARDIZATION C1 5956617 without license from IHS