ISO INTERNATIONAL STANDARD 20043-1 First edition 2021-01 Measurement of radioactivity in the environment Guidelines for effective dose assessment using environmental monitoring data - Part 1: Planned and existing exposure situation Mesurage de la radioactivite dans I'environnement - Lignes directrices pour I'évaluation de la dose efficace a I'aide de données de surveillance environnementale- Partie 1: Situation d'exposition existante et planifiée Reference number IS0 20043-1:2021(E) OS1 @ IS0 2021 IS0 20043-1:2021(E) COPYRIGHTPROTECTEDDOCUMENT IS02021 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 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: +41 22 749 01 11 Email: [email protected] Website: www.iso.org Published in Switzerland ii @ IS0 2021 - All rights reserved