ISO INTERNATIONAL STANDARD 21847-3 First edition 2007-09-01 Nuclear fuel technology Alpha spectrometry - Part 3: Determination of uranium 232 in uranium and its compounds Technologie du combustible nucléaire - Spectrometrie alpha - Partie 3: Détermination de I'uranium 232 dans I'uranium et ses composés Reference number ISO 21847-3:2007(E) ISO @ISO2007 ISO 21847-3:2007(E) PDF disclaimer This PDF file may contain embedded typefaces. In accordance with Adobe's licensing policy, this file may be printed or viewed but shall not be edited unless the typefaces which are embedded are licensed to and installed on the computer performing the editing. In accepts no liability in this area. Adobe is atrademark of Adobe Systems Incorporated. the unlikely event that a problem relating to it is found, please inform the Central Secretariat at the address given below. COPYRIGHTPROTECTEDDOCUMENT @ISO2007 All rights reserved. Unless otherwise specified, no part of this publication may be reproduced or utilized in any form or by any means, electronic or mechanical, including photocopying and microfilm, without permission in writing from either ISsO 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 ii @ ISO 2007-All rights reserved ISO 21847-3:2007(E) Foreword IsO (the International Organization for Standardization) is a worldwide federation of national standards bodies technical committees. Each member body interested in a subject for which a technical committee has been non-governmental, in liaison with isO, also take part in the work. isO collaborates closely with the International Electrotechnical Commission (IEC) on all matters of electrotechnical standardization. International Standards are drafted in accordance with the rules given in the ISO/lEC Directives, Part 2. The main task of technical committees is to prepare International Standards. Draft International Standards International Standard requires approval by at least 75 % of the member bodies casting a vote. Attention is drawn to the possibility that some of the elements of this document may be the subject of paten rights. IsO shall not be held responsible for identifying any or all such patent rights. ISO 21847-3 was prepared by Technical Committee ISO/TC 85, Nuclear energy, Subcommittee SC 5, Nuclear fuel technology. Iso 21847 consists of the following parts, under the general title Nuclear fuel technology V-Alpha spectrometry: Part 1: Determination of neptunium in uranium and its compounds Part 2: Determination of plutonium in uranium and its compounds Part3:Determinationofuranium232 inuraniumand itscompounds ISO 2007 - All rights reserved ili INTERNATIONAL STANDARD ISO 21847-3:2007(E) Nuclear fuel technology Alpha spectrometry Part 3: Determination of uranium 232 in uranium and its compounds Scope This part of IsO 21847 describes a method for determining trace amounts of 232U in uranium hexafluoride, uranium oxides or uranylnitrate. Normative references The following referenced documents are indispensable for the application of this document. For dated references, only the edition cited applies. For undated references, the latest edition of the referenced document (including any amendments) applies. ISO 3696, Water for analytical laboratory use - Specification and test methods 3 Principle Undesirable elements (e.g. Th) are removed by liquid-liquid extraction. Sources are prepared by electro-deposition and 232u is assayed by alpha spectrometry. 4 Reagents Use reagents of recognized analytical grade 4.1 Water, at least quality 1 as specified in ISO 3696 4.2 Nitric acid, concentrated, c(HNO3) = 15,8 mol/l. 4.3 Nitric acid, c(HNO3) = 7 mol/l. 4.4 Nitric acid, c(HNO3) = 2 mol/l. 4.5 Nitric acid, dilute, c(HNO3) = 0,1 mol/l. 4.6 Thenoyltrifluoroacetone, (TTA; CgH5F3O2S) solution in xylene, c(CgH5F3O2S) = 0,25 mol/l.