ISO INTERNATIONAL STANDARD 11483 Second edition 2005-01-15 Nuclear fuel technology Preparation of plutonium sources and determination of 238Pu/239Pu isotope ratio by alpha spectrometry Technologie du combustible nucléaire-Préparation des sourcesde plutonium et détermination du rapport isotopique 238Pu/239Pu par spectrometrie alpha Reference number ISO 11483:2005(E) LSO ISO 2005 ISO11483:2005(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 acceptsnoliabilityinthisarea AdobeisatrademarkofAdobeSystemsIncorporated. the unlikely event that a problem relating to it is found, please inform the Central Secretariat at the address given below. ? ISO2005 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 isO at the address below or IsO's memberbody in thecountry of therequester. ISO copyright office Casepostale56.CH-1211Geneva20 Tel. + 4122749 0111 Fax + 4122749 09 47 E-mail [email protected] Web www.iso.org Published in Switzerland ii ISO 2005-All rights reserved ISO11483:2005(E) Contents Page Foreword 1 Scope. 2 Principle 3 Source preparation... 3.1 Source preparation on electrochemically polished stainless-steel disc [4] 3.1.1 Apparatus.... 3.1.2 Reagents. 3.1.3 Procedure. 3.2 Sourcepreparation onporcelain disc [5] 3.2.1 Apparatus... 3.2.2 Reagents, 3.2.3 Procedure.. 3.3 Sourcepreparationbyelectrodeposition[2], 3.3.1 Apparatus. 3.3.2 Reagents. 3.3.3 Procedure 4 Alpha spectrometry 4.1 Apparatus.. 4.2 Measurement... 4.3 Spectra evaluation. 4.3.1 Principle.... 4.3.2 Geometric-progressiondecreasemethod[9] 4.3.3 Exponentialdecreasemethod..... 5 Expression ofresults... 6 Interference of americium 7 Resolution of the α spectra... 8 Repeatability. 6 Reproducibility... 10 Interferences.. Annex A (informative) Combined standard uncertainty evaluation.. A.1 Standard uncertainty R(α).... 11 A.2 Combined standard uncertainty R8/9 ... 14 A.3 Evaluation of R8/9... Bibliography @ Is 2005 - All rights reserved ili ISO11483:2005(E) Foreword IsO (the International Organization for Standardization) is a worldwide federation of national standards bodies (isO member bodies). The work of preparing International Standards is normally carried out through ISO 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 adopted by the technical committees are circulated to the member bodies for voting. Publication as an International Standard requires approval by at least 75%of thememberbodies castinga vote. rights.IsO shall not be held responsible for identifying any or all such patent rights. ISO 11483 was prepared by Technical Committee ISO/TC 85, Refrigeration and air-conditioning Subcommittee SC 5, Nuclear fuel technology. This second edition cancels and replaces the first edition (iSO 11483:1994),of which it constitutes a technical revision. iv @ ISO 2005 - All rights reserved INTERNATIONALSTANDARD ISO11483:2005(E) NuclearfueltechnologyPreparation of plutonium sources and determination of 238Pu/239Pu isotope ratio by alpha spectrometry 1 Scope This International Standard describes three simple and fast procedures to prepare plutonium sources and a method is used for the determination of isotopic abundance of 238Pu in combination with mass spectrometry and eliminates the possible interferences of 238u in the latter method. It applies to the analysis of purified solutions of plutonium in 2 mol/l to 4 mol/l nitric acid containing 50 μg to 200 μg of plutonium per millilitre, as spectrometry Th