ISO INTERNATIONAL STANDARD 11665-1 Second edition 2019-09 Measurement of radioactivity in the environment Air: radon-222 Part 1: Origins of radon and its short-lived decay products and associated measurement methods Mesurage de la radioactivité dans I'environnementAir: radon 222- Partie1:Origine duradon et de ses descendants avie courte, et méthodes de mesure associées Referencenumber IS011665-1:2019(E) @IS0 2019 IS0 11665-1:2019(E) COPYRIGHTPROTECTEDDOCUMENT @ISO2019 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 on the internet or an intranet, without prior written permission. Permission can be requested from either IsO at the address belowor Iso'smemberbody in the country ofthe requester. ISO copyright office CP 401 : Ch. de Blandonnet 8 CH-1214 Vernier, Geneva Phone:+41227490111 Fax:+412274909 47 Email: [email protected] Website:www.iso.org Published in Switzerland ii @ IS0 2019 - All rights reserved