1、Designation:C141318Standard Test Method forIsotopic Analysis of Hydrolyzed Uranium Hexafluoride andUranyl Nitrate Solutions by Thermal Ionization MassSpectrometry1This standard is issued under the fixed designation C1413;the number immediately following the designation indicates the year oforiginal
2、adoption or,in the case of revision,the year of last revision.A number in parentheses indicates the year of last reapproval.Asuperscript epsilon()indicates an editorial change since the last revision or reapproval.1.Scope1.1 This method applies to the determination of isotopiccomposition in hydrolyz
3、ed nuclear grade uranium hexafluo-ride.It covers isotopic abundance of235U between 0.1 and5.0%mass fraction,abundance of234U between 0.0055 and0.05%mass fraction,and abundance of236U between 0.0003and 0.5%mass fraction.This test method may be applicable toother isotopic abundance providing that corr
4、esponding stan-dards are available.1.2 This test method can apply to uranyl nitrate solutions.This can be achieved either by transforming the uranyl nitratesolution to a uranyl fluoride solution prior to the deposition onthe filaments or directly by depositing the uranyl nitratesolution on the filam
5、ents.In the latter case,a calibration withuranyl nitrate standards must be performed.1.3 This test method can also apply to other nuclear gradematrices(for example,uranium oxides)by providing a chemi-cal transformation to uranyl fluoride or uranyl nitrate solution.1.4 UnitsThe values stated in SI un
6、its are to be regardedas standard.No other units of measurement are included in thisstandard.1.5 This standard does not purport to address all of thesafety concerns,if any,associated with its use.It is theresponsibility of the user of this standard to establish appro-priate safety,health,and environ
7、mental practices and deter-mine the applicability of regulatory limitations prior to use.1.6 This international standard was developed in accor-dance with internationally recognized principles on standard-ization established in the Decision on Principles for theDevelopment of International Standards
8、,Guides and Recom-mendations issued by the World Trade Organization TechnicalBarriers to Trade(TBT)Committee.2.Referenced Documents2.1 ASTM Standards:2C696 Test Methods for Chemical,Mass Spectrometric,andSpectrochemical Analysis of Nuclear-Grade Uranium Di-oxide Powders and PelletsC753 Specification
9、 for Nuclear-Grade,Sinterable UraniumDioxide PowderC761 Test Methods for Chemical,Mass Spectrometric,Spectrochemical,Nuclear,and Radiochemical Analysis ofUranium HexafluorideC776 Specification for Sintered Uranium Dioxide Pellets forLight Water ReactorsC787 Specification for Uranium Hexafluoride for
10、 Enrich-mentC788 Specification for Nuclear-Grade Uranyl Nitrate Solu-tion or CrystalsC859 Terminology Relating to Nuclear MaterialsC996 Specification for Uranium Hexafluoride Enriched toLess Than 5%235UC1334 Specification for Uranium Oxides with a235U Con-tent of Less Than 5%for Dissolution Prior to
11、 Conversionto Nuclear-Grade Uranium DioxideC1346 Practice for Dissolution of UF6from P-10 TubesC1347 Practice for Preparation and Dissolution of UraniumMaterials for AnalysisC1348 Specification for Blended Uranium Oxides with235UContent of Less Than 5%for Direct Hydrogen Reductionto Nuclear Grade Ur
12、anium Dioxide(Withdrawn 2013)33.Terminology3.1 For definitions of terms used in this test method but notdefined herein,refer to Terminology C859.1This test method is under the jurisdiction ofASTM Committee C26 on NuclearFuel Cycle and is the direct responsibility of Subcommittee C26.05 on Methods of
13、Test.Current edition approved Nov.1,2018.Published December 2018.Originallyapproved in 1999.Last previous edition approved in 2011 as C1413 05(2011).DOI:10.1520/C1413-18.2For referenced ASTM standards,visit the ASTM website,www.astm.org,orcontact ASTM Customer Service at serviceastm.org.For Annual B
14、ook of ASTMStandards volume information,refer to the standards Document Summary page onthe ASTM website.3The last approved version of this historical standard is referenced onwww.astm.org.Copyright ASTM International,100 Barr Harbor Drive,PO Box C700,West Conshohocken,PA 19428-2959.United StatesThis
15、 international standard was developed in accordance with internationally recognized principles on standardization established in the Decision on Principles for theDevelopment of International Standards,Guides and Recommendations issued by the World Trade Organization Technical Barriers to Trade(TBT)
16、Committee.1 4.Summary of Test Method4.1 After dilution of uranyl fluoride or uranyl nitratesolution,approximately 2 g of uranium are deposited on arhenium filament.Analysis is performed in a thermal ionizationmass spectrometer(TIMS),uranium is vaporized and ionizedthrough electrons emitted by a second filament;ions areextracted by an electric field,separated by a magnetic field,andcollected by four collectors on mass 234,235,236,238.Thecollectors are either faraday cups or electron multipliersco
