ISO INTERNATIONAL STANDARD 16639 First edition 2017-01 Surveillance of the activity concentrations of airborne radioactive substances in the workplace of nuclear facilities Surveillance de I'activité volumique des substances radioactives dans I'air des lieux de travail des installations nucléaires Reference number IS0 16639:2017(E) so InternationalOrganizationforStandardization HEJIANG INST OF STANDARDIZATION C15956617 @IS02017 IS0 16639:2017(E) COPYRIGHTPROTECTEDDOCUMENT IS02017,PublishedinSwitzerland 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. ISO copyright office Ch. de Blandonnet 8 . CP 401 CH-1214 Vernier, Geneva, Switzerland Tel. +41 22 749 01 11 Fax+412274909 47 copyright@iso.org www.iso.org Intenationai br PrganizationforStandardization icensee-ZHEJIANG INST.OF STANDARDIZRoISQ s1.7 - All rights reserved I by IHS unde etworking permitted without license from IHS IS0 16639:2017(E) Contents Page Foreword ..V Introduction. ...vi 1 Scope. 2 Normative references 3 Terms and definitions 4 Symbols. .5 5 Developing the surveillance program .5 5.1 Reasons for conducting a surveillance programme .5 5.1.1 .5 General 5.1.2 Sampling when respiratory protective equipment is used .6 5.1.3 Sampling to establish air contamination areas. 5.1.4 Air sampling as a basis for determining worker intakes .6 5.1.5 Air monitoring for early warning of elevated air concentrations 5.2 Graded approach to sampling 7 5.3 Frequency of sampling .8 5.3.1 General. ..8 5.3.2 Grab vs. continuous sampling ..8 5.3.3 Continuous monitoring of activity concentrations ..8 5.3.4 Prompt analysis of certain samples .9 5.4 Substitutes for air sampling.... 6 Location of samplers and monitors .9 6.1 General .9 6.2 Types of air flow studies 6.2.1 General .9 6.2.2 Qualitativeairflowstudies 6.2.3 Quantitativeairflowstudies .10 6.3 Location of samplers for estimating committed effective dose ..10 6.4 Location of samplersforevaluating effectiveness of containment ..11 6.5 Location of samplers for posting of air contamination areas ..11 6.6 Location of portable samplers.. .12 6.7 LocationofCAMforcontinuousmonitoringoftheactivityconcentration .12 7 Collection of samples .12 7.1 General .12 7.2 Sampling of aerosol particles ..12 7.3 Gas Sampling. ..13 8 Evaluation of sampling results. ..14 8.1 Determining the average activity concentration ..14 8.2 Uncertainty. ..14 8.3 Techniques for correcting for radon progeny interference ..15 8.4 Evaluating changes in activity concentration over time 8.5 Review of sampling results. .15 9 Evaluating the effectiveness of the sampling program ..16 9.1 General .16 9.2 Dose-based assessment of the adequacy of the sampling program. ..16 10 Quality assurance and quality control .17 10.1 General .17 10.2 Sample identification, handling, and storage ..17 10.3 Sampling and monitoring equipment. .17 10.3.1 General. ..17 10.3.2 Performance of measuring instruments .18 iii nsee=ZHEJIANG INST OF STANDARDIZATION C1 5956617 d without license from IHS Not for Resale, 2017/3/28 02:43:24