ISO INTERNATIONAL STANDARD 10704 Second edition 2019-02 Water quality - Gross alpha and gross beta activity Test method using thin source deposit QualitedeI'eauActivités alpha globale et betaglobale-Methode d'essai par dépot d'une source fine Referencenumber IS010704:2019(E) so @IS0 2019 IS010704:2019(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 below orIso's memberbody in the countryof therequester. ISO copyright office CP 401 : Ch. de Blandonnet 8 CH-1214 Vernier, Geneva Phone:+41227490111 Fax:+41 22 749 09 47 Email: copyright@iso.org Website: www.iso.org Published in Switzerland ii @ IS0 2019- All rights reserved IS010704:2019(E) Contents Page Foreword ..V Introduction.. ...vi 1 Scope.. 2 Normative references 3 Terms,definitionsandsymbols 4 Principle 5 Chemical reagents and equipment .3 5.1 Reagents .3 5.1.1 General. .3 5.1.2 Standard solutions .3 5.1.3 Wetting or surfactant agents .4 5.1.4 Volatile organic solvents. .4 5.1.5 Water. .4 5.1.6 Specific reagents for alpha-emitting radionuclides co-precipitation 4 5.2 Equipment. .4 5.2.1 Laboratory equipment fordirect evaporation 4 5.2.2 General equipment. .4 5.2.3 Special equipmentfor alpha-emitting radionuclide co-precipitation .5 5.2.4 Measurement equipment .5 6 Sampling .5 7 Procedure. .5 7.1 Preliminary .5 7.2 Source preparation .5 7.2.1 Preparation of planchet .5 7.2.2 Evaporation. .6 7.2.3 Co-precipitation. ..6 7.3 Counting stage .7 7.4 Background and blank determination .7 7.5 Preparation of counting standard for calibration. .7 7.6 Preparationof calibration sourceforself-absorption determination .8 7.6.1 General .8 7.6.2 Spiking one of two test portions ..8 7.6.3 Self-absorption curve. .8 8 Expression of results .9 8.1 General .9 8.2 Alpha activity concentration .9 8.3 Beta activity concentration .9 8.4 Standard uncertainty of the alpha activity concentration .10 8.5 Standard uncertainty of the beta activity concentration .10 8.6 Decisionthreshold. .12 8.6.1 Decision threshold of the alpha activity concentration ..12 8.6.2 Decision threshold of the beta activity concentration ..12 8.7 Detection limit. ..12 8.7.1 Detection limitofthealpha activity concentration .12 8.7.2 Detectionlimitofthebetaactivityconcentration. ..13 8.8 Confidence limits. ..13 9 Control of interferences .13 9.1 General ..13 9.2 Relative humidity ..14 9.3 Geometryofthedeposit. ..14 9.4 Crosstalk .14 @IS0 2019-All rights reserved iii