ISO INTERNATIONAL STANDARD 11665-11 First edition 2016-04-15 Measurement of radioactivity in the environment Air: radon-222 Part 11: Test method for soil gas with sampling at depth Mesurage de la radioactivité dans I'environnement - Air: radon 222 Partie 11: Méthode d'essai pour le gaz du sol avec un prelevement en profondeur Reference number IS0 11665-11:2016(E) ISO International Organization for Standardization @ IS0 2016 IS0 11665-11:2016(E) COPYRIGHTPROTECTEDDOCUMENT 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 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 or ISO's member body in the country of the requester. ISOcopyrightoffice 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 Intenationaibr PrganizationforStandardization ensee-ZHEJIANG INST OF STANDARDIZRoISQ ,6 - All rights reserved Not for Resale, 2016/7/20 03:00:16 etworking permitted without license from IHS IS0 11665-11:2016(E) Contents Page Foreword ..iv Introduction. ..V 1 Scope. ..1 2 Normative references 3 Terms, definitions and symbols ..2 3.1 Terms and definitions .2 3.2 Symbols.... 4 Principle .3 5 Equipment ..3 6 Sampling .4 6.1 Sampling objective. .4 6.2 Sampling characteristics. ..4 6.3 Sampling conditions .4 6.3.1 General. .4 6.3.2 Location of sampling place .5 6.3.3 Sampling duration .5 6.3.4 Volume of air sampled 5 6.3.5 Minimal depth of sampling .5 7 Detection .6 8 Measurement .6 8.1 Procedure. . 6 8.2 Influence quantities ..6 8.3 Calibration .1 9 Expression of results .7 9.1 Radon activity concentration. ..7 9.2 Standard uncertainty .7 9.3 Decision threshold and detection limit. .7 9.4 Limits of the confidence interval 10 Test report ..8 Annex A (informative) Values of soil-gas volumes available for extraction ..10 Annex B (normative) Measurement method using an active sampling ..11 Annex C (normative) Measurement method using a passive sampling ..18 Annex D (informative) Examples of soil-gas sampling probes for active sampling ..21 Bibliography .24 iii e=ZHEJIANG INSTOFSTANDARDIZATION C15956617 vided by IHS under lic withoutlicense from IHS