ISO INTERNATIONAL STANDARD 11843-6 Second edition 2019-02 Capability of detection - Part 6: Methodology for the determination of the critical value and the minimum detectable value in Poisson distributed measurements by normal approximations Capacité de détection - Partie 6: Méthodologie pour la détermination de la valeur critique et de la valeur minimale détectable pour les mesures distribuees selon la loi de Poisson approximee par la loi Normale Reference number ISO 11843-6:2019(E) os1 @ IS0 2019 IS0 11843-6:2019(E) COPYRIGHTPROTECTEDDOCUMENT @ IS0 2019 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 Fax: +41 22 749 09 47 Email: [email protected] Website: www.iso.org Published in Switzerland ii @ IS0 2019 - All rights reserved IS0 11843-6:2019(E) Contents Page Foreword ..iv Introduction ..V 1 Scope. ..1 2 Normative references ..1 3 Terms and definitions ..1 4 Measurement system and data handling ..2 5 Computation by approximation .2 5.1 The critical value based on the normal distribution. .2 5.2 Determination of the critical value of the response variable .4 5.3 Sufficient capability of the detection criterion .5 5.4 Confirmation of the sufficient capability of detection criterion ..5 6 Reporting the results from an assessment of the capability of detection ..6 7 Reporting the results from an application of the method .7 Annex A (informative) Symbols used in this document .8 Annex B (informative) Estimating the mean value and variance when the Poisson distribution is approximated by the normal distribution .10 Annex C (informative) An accuracy of approximations ..11 Annex D (informative) Selecting the number of channels for the detector ..17 Annex E (informative) Examples of calculations ..18 Bibliography .23 @ IS0 2019 - All rights reserved ii