ISO INTERNATIONAL STANDARD 18589-7 First edition 2013-10-01 Measurement of radioactivity in the environment Soil - Part 7: In situ measurement of gamma- emitting radionuclides Mesurage de la radioactivité dans I'environnement - Sol - Partie 7: Mesurage in situ des radionucleides émetteurs gamma Reference number IS0 18589-7:2013(E) LSO @ IS0 2013 I without license from IHS Not for Resale IS0 18589-7:2013(E) COPYRIGHTPROTECTEDDOCUMENT ISO2013 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 Case postale 56:CH-1211 Geneva 20 Tel. + 41 22 749 01 11 Fax + 41 22 749 09 47 E-mail [email protected] Web www.iso.org Published in Switzerland @ IS0 2013 - All rights reserved No reproductic networking permited without license from IHS Not for Resale IS0 18589-7:2013(E) Contents Page Foreword ..iv Introduction. ..V 1 Scope. .1 2 Normative references ..1 3 Terms, definitions, symbols, and units. ..2 3.1 Terms and definitions .2 3.2 Symbols and units... 4 Principles .6 4.1 Measurement method .6 4.2 Uncertainties of the measurement method ..6 5 Equipment .6 5.1 Portable in situ spectrometry system .6 5.2 Detector System .7 5.3 Pulse processing electronics .8 5.4 Assemblyjigforadetectorsystem .9 5.5 Collimated detector. .9 Procedure .12 6 6.1 Calibration ..12 6.2 Method of combined calibrations ..12 7 Quality assurance and quality control program. ..17 7.1 General .17 7.2 Influencing variables 17 7.3 Instrument verification. 17 7.4 Method verification. .17 7.5 Quality control program .17 7.6 Standard operating procedure. ..19 8 Expression of results. .19 8.1 Calculation of activity per unit of surface area or unit of mass 19 8.2 Calculation of the characteristic limits and the best estimate of the measurand as well as itsstandarduncertainty 19 8.3 Calculation of the radionuclide specific ambient dose rate. .21 9 Test report .22 Annex A (informative) Influence of radionuclides in air on the result of surface or mass activity measured by in situgamma spectrometry .23 Annex B (informative) Influence quantities ..24 Annex C (informative) Characteristics of germanium detectors .27 Annex D (informative) Field-of-view of an in situ gamma spectrometer as a function of the photon energy for different radionuclide distributions in soil. 29 Annex E (informative) Methods for calculating geometry factors and angular correction factors.33 Annex F (informative) Example for calculation of the characteristic limits as well as the best estimate of the measurand and its standard uncertainty. 41 Annex G (informative) Conversion factors for surface or mass activity to air kerma rate and ambient dose equivalent rate for different radionuclide distribution in soil .45 Annex H (informative) Mass attenuation factors for soil and attenuation factors for air as a .52 Bibliography. ..54 iii Not for Resale