ISO INTERNATIONAL STANDARD 18589-5 Second edition 2019-12 Measurement of radioactivity in the environment Soil - Part 5: Strontium 90 Test method using proportional counting or liquid scintillation counting Mesurage de la radioactivité dans I'environnement-Sol - Partie 5: Strontium 90-Methode d'essai par comptage proportionneletscintillation liquide Reference number IS0 18589-5:2019(E) ISO @ IS0 2019 IS018589-5:2019(E) COPYRIGHTPROTECTEDDOCUMENT @ IS0 2019 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 below orIso's member body in the country of therequester. ISO copyright office CP 401 : Ch. de Blandonnet 8 CH-1214 Vernier, Geneva Phone:+41227490111 Fax: +41 22 749 09 47 Email: copyright@iso.org Website: www.iso.org Published in Switzerland i @ISo 2019- All rights reserved IS018589-5:2019(E) Contents Page Foreword .V Introduction. .vi 1 Scope. .1 2 Normative references .1 3 Terms and definitions .2 3.1 Terms and definitions .2 3.2 Symbols. 2 Principle. .3 4 4.1 General 3 4.2 Chemical separation 3 4.3 Detection 4 4.3.1 General .4 4.3.2 Sourcepreparation forliquid scintillation counter 4 4.3.3 Sourcepreparation for proportional counter 4.3.4 Background determination. 4 5 Chemical reagents and equipment .5 6 Procedure of strontium desorption .5 6.1 Principles 5 6.2 Technical resources 6 6.2.1 Equipment 6 6.2.2 Chemical reagents 6 6.3 Procedure.. .6 7 Chemical separation procedure by precipitation .7 Principles. 7.1 7.2 Technical resources. 7 7.2.1 Equipment 7.2.2 Chemical reagents.. 8 7.3 Procedure .8 7.3.1 Separation of alkaline metals and calcium 8 7.3.2 Separation of barium, radium and lead. .9 7.3.3 Separation of fission products and yttrium .9 7.3.4 Strontiumpurification .9 7.3.5 Yttrium extraction. 10 7.3.6 Determination of the chemical yields 11 8 Chemical separation procedure by liquid-liquid extraction 11 8.1 Principle. 11 8.2 Technical resources 12 8.2.1 Equipment 12 8.2.2 Chemical reagents. 12 8.3 Procedure 13 8.3.1 General. 13 8.3.2 Chemical separation of yttrium. 13 8.3.3 Source preparation to be measured by PC 14 8.3.4 Source preparation to be measured by LSC .14 8.3.5 Determination of the chemical yields. .14 9 Chemical separation procedure by chromatography (crown ether resin) .15 9.1 Principles .15 9.2 Technical resources 15 9.2.1 Equipment 15 9.2.2 Chemical reagents.. 15 9.3 Procedure 16 IS0 2019-All rights reserved iii