ISO/TS TECHNICAL SPECIFICATION 11665-12 First edition 2018-10 Measurement of radioactivity in the environment Air: radon-222 Part 12: Determination of the diffusion coefficient in waterproof materials: membrane one-side activity concentration measurement method Mesurage dela radioactivitédans I'environnement-Air:radon 222 Partie 12: Détermination du coefficient de diffusion des materiaux imperméables:meéthodedemesuredeI'activité volumigued'un cote delamembrane Reference number IS0/TS 11665-12:2018(E) ISO @ IS0 2018 IS0/TS11665-12:2018(E) COPYRIGHTPROTECTEDDOCUMENT IS02018 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 or Iso's member body in the country of the requester. ISO copyright office CP 401 : Ch. de Blandonnet 8 CH-1214 Vernier, Geneva Phone: +4122 749 0111 Fax: +41 22 749 09 47 Email: [email protected] Website: www.iso.org Published in Switzerland ii @ IS0 2018 - All rights reserved IS0/TS11665-12:2018(E) Contents Page Foreword ..iv Introduction. ..V 1 Scope. ..1 2 Normative references 3 Terms,definitionsandsymbols 3.1 Terms and definitions .1 3.2 Symbols.... 4 Principle. ..3 5 ..5 Equipment 6 Sample preparation .6 6.1 General consideration .6 6.2 Fixing the sample in the holder .7 6.3 Connection of the holder (cap) with the chamber .7 7 Control measurements .8 7.1 Verification of radon-tightness 7.2 Calibration 9 7.3 Detector background .9 7.4 Instrument statisticalfluctuation .9 8 Measurement of radon activity concentration .10 9 Processing and expression ofthe resultsforthe sample ..11 9.1 Determinationoftheradondiffusioncoefficientinthesample .11 9.2 Characteristicsofmeasurementlimits .11 9.3 Estimationof confidenceintervaland uncertainty .13 9.4 Expression oftheresults .13 10 Requirements forthetest ..14 11 Influencingfactors ..15 12 Expression ofthe results and assessment of the standard uncertainty for the material....16 13 .17 Qualitymanagementandcalibrationofthetestdevice 14 Test report .17 14.1 Thetest reportformaterial .17 14.2 The test report for each sample .18 ..18 14.3 Archived material Annex A (informative) Determination of the radon diffusion coefficient of the sample ..19 Bibliography .27 IS0 2018-All rights reserved ili