ISO INTERNATIONAL STANDARD 11665-6 Second edition 2020-01 Measurement of radioactivity in the environment Air: radon-222 Part 6: Spot measurement methods of the activity concentration Mesurage dela radioactivite dans I'environnementAir:radon 222- Partie 6: Methodes de mesure ponctuelle de I'activité volumique Reference number IS011665-6:2020(E) ISO @IS02020 IS011665-6:2020(E) COPYRIGHTPROTECTEDDOCUMENT @ IS0 2020 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: [email protected] Website: www.iso.org Published in Switzerland i @IS0 2020 - All rights reserved IS011665-6:2020(E) Contents Page Foreword iv Introduction. Scope. 1 1 2 Normative references 1 3 Terms,definitionsand symbols .1 3.1 Terms and definitions 1 3.2 Symbols... 2 4 Principle .2 5 Equipment .3 6 Sampling. .3 6.1 Sampling objective. 3 6.2 Sampling characteristics. 3 6.3 Sampling conditions. 3 6.3.1 General. 3 6.3.2 Locationofsamplingplace 3 6.3.3 Sampling duration .3 6.3.4 Volume of air sampled 3 7 .4 Detection 8 Measurement .4 8.1 Procedure .4 8.2 Influence quantities 4 8.3 Calibration 4 Expression of results .5 9 9.1 Radon activity concentration 5 9.2 Standard uncertainty 5 9.3 Decisionthresholdand detection limit 5 9.4 Limitsof the confidenceinterval .5 10 .5 Testreport Annex A (informative)Measurementmethod using scintillation cells Bibliography 13 IS0 2020 -All rights reserved iii