ASTM C1429-1999(2009)e1 Standard Test Method for Isotopic Analysis of Uranium Hexafluoride by Double-Standard Multi-Collector Gas Mass Spectrometer《用双标准多收集器气体质谱仪进行六氟化铀同位素分析标准试验方法》.pdf
《ASTM C1429-1999(2009)e1 Standard Test Method for Isotopic Analysis of Uranium Hexafluoride by Double-Standard Multi-Collector Gas Mass Spectrometer《用双标准多收集器气体质谱仪进行六氟化铀同位素分析标准试验方法》.pdf》由会员分享,可在线阅读,更多相关《ASTM C1429-1999(2009)e1 Standard Test Method for Isotopic Analysis of Uranium Hexafluoride by Double-Standard Multi-Collector Gas Mass Spectrometer《用双标准多收集器气体质谱仪进行六氟化铀同位素分析标准试验方法》.pdf(4页珍藏版)》请在麦多课文档分享上搜索。
1、Designation: C 1429 99 (Reapproved 2009)1Standard Test Method forIsotopic Analysis of Uranium Hexafluoride by Double-Standard Multi-Collector Gas Mass Spectrometer1This standard is issued under the fixed designation C 1429; the number immediately following the designation indicates the year oforigin
2、al 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.1NOTESection 1.3 was updated editorially in July 2009.1. Scope1.1 This test m
3、ethod covers a quantitative test methodapplicable to determining the mass percent of uranium isotopesin uranium hexafluoride (UF6) samples. This method as de-scribed is for concentrations of235U between 0.1 and 10mass %, and234U and236U between 0.0001 and 0.1 mass %.1.2 This test method is for labor
4、atory analysis by a gas massspectrometer with a multi-collector.1.3 This standard complements Test Methods C 761, thedouble-standard method for gas mass spectrometers using asingle collector, by providing a method for spectrometers usinga multi-collector.1.4 This standard does not purport to address
5、 all of thesafety concerns, if any, associated with its use. It is theresponsibility of the user of this standard to establish appro-priate safety and health practices and determine the applica-bility of regulatory limitations prior to use.2. Referenced Documents2.1 ASTM Standards:2C 761 Test Method
6、s for Chemical, Mass Spectrometric,Spectrochemical, Nuclear, and Radiochemical Analysis ofUranium HexafluorideC 787 Specification for Uranium Hexafluoride for Enrich-mentC 996 Specification for Uranium Hexafluoride Enriched toLess Than 5 %235UC 1215 Guide for Preparing and Interpreting Precision and
7、Bias Statements in Test Method Standards Used in theNuclear Industry3. Terminology3.1 Definitions of Terms Specific to This Standard:3.1.1 A standard, nthe low-value standard of a standardpair that brackets the sample.3.1.2 B standard, nthe high-value standard of a standardpair that brackets the sam
8、ple.3.1.3 determination, na single isotopic value, calculatedfrom a sequence of ratios; the most basic isotopic valuecalculated.3.1.4 Lagranges interpolation formula, na mathematicalequation designed to estimate values between two or moreknown values.3.1.5 run, na completed, six-entry symmetrical se
9、quenceconsisting of A standard, sample, B standard, B standard,sample, and A standard from which a determination can becalculated for one or more isotopes.3.1.6 standard spread, nthe difference between the highand low standards; sometimes called standard range.3.1.7 test result, na reported value; t
10、he mean of two ormore determinations.4. Summary of Test Method4.1 Uranium hexafluoride gas is introduced into an ioniza-tion source. The resulting ions are accelerated down the flighttube into the magnetic field. The magnetic field separates theions into ion beams in accordance with the m/e ratio. F
11、ourcollectors are stationed so the234UF5+,235UF5+,236UF5+, and238UF5+ion beams strike individual collectors.4.2 Two standards are chosen whose values bracket thedesired isotope of the sample. The sample and two standardsare introduced in a six-entry, symmetrical sequence. Then,measurements are taken
12、 that give the mole ratio of the desiredisotope to238U.1This test method is under the jurisdiction of ASTM CommitteeC26 on NuclearFuel Cycle and is the direct responsibility of Subcommittee C26.05 on Methods ofTest.Current edition approved June 1, 2009. Published July 2009. Originally approvedin 199
13、9. Last previous edition approved in 2004 as C 1429 99 (2004).2For referenced ASTM standards, visit the ASTM website, www.astm.org, orcontact ASTM Customer Service at serviceastm.org. For Annual Book of ASTMStandards volume information, refer to the standards Document Summary page onthe ASTM website
14、.1Copyright ASTM International, 100 Barr Harbor Drive, PO Box C700, West Conshohocken, PA 19428-2959, United States.4.3 Through Lagranges interpolation formula, these mea-surements are used to calculate the mass percent of the desiredisotope. If standards are available that bracket all isotopes, the
15、nthe234U,235U, and236U mass percents are calculated from thesame six-entry run.4.4 The results of two six-entry, symmetrical-sequence runsare averaged to find test results for each isotope. The238U masspercent is obtained by subtraction.5. Significance and Use5.1 Uranium hexafluoride used to produce
16、 nuclear-reactorfuel must meet certain criteria for its isotopic composition.This test method may be used to help determine if samplematerials meet the criteria described in Specifications C 787and C 996.6. Apparatus6.1 Mass spectrometer with the following features andcapabilities:6.1.1 An ion sourc
17、e with an accelerating voltage of approxi-mately 8 kV,6.1.2 A resolving power of greater than or equal to 500,6.1.3 A minimum of three points of attachment for stan-dards or samples,6.1.4 An ion collection system consisting of four collectorcups stationed to collect234UF5+,235UF5+,236UF5+, and238UF5
18、+ions,6.1.5 An ion-current amplifier for each collector cup,6.1.6 A voltage-to-frequency (V-to-F) converter for eachamplifier,6.1.7 A counter for each V-to-F converter, and6.1.8 Computer control over opening and closing valves, thetiming, and the integration of analytical sequences.7. Procedure7.1 S
19、elect standards:7.1.1 Choose high and low standards that bracket thesample isotope(s) being evaluated. If the mass percentof234U,235U, and236U are all desired, then the two standardsmust bracket each of the three isotopes to permit calculation ofall isotopes for every run.7.1.2 If standards that bra
20、cket all isotopes are unavailable,analyze the isotope(s) bracketed by the originally selectedstandards, then select other standards to run the remainingisotope(s).7.2 Prepare Sample and Standards:7.2.1 Attach sample and standard containers to the spec-trometer.7.2.2 Open and close the appropriate va
21、lves to evacuate theair from the inlet system.7.2.3 Open the sample and standard containers individuallyand vent the gas phase to the cold trap. This is to removeimpurities that may bias the results or interfere with theionization. If necessary, freeze the UF6with ice water or amixture of crushed dr
22、y ice and isopropyl alcohol to permitlonger venting without losing large amounts of UF6.7.2.4 Permit exhaust system pressure to recover.7.2.5 Check to see if impurities have been sufficientlyremoved by introducing UF6into the ion source and observingpressure, or exhausting through the cold trap and
23、observingpressure on the other side, or any other suitable means.7.2.6 If necessary, repeat 7.2.3-7.2.5 until samples are clean.7.3 Prepare Instrument:7.3.1 Adjust instrument parameters to focus ion beams inproper collectors and maximize the238UF5+current reading.7.3.2 Enter standard values and othe
24、r information if neededfor calculations performed by computer.7.3.3 Program the spectrometer to run two of the followingsix-entry, symmetrical sequences: low standard, sample, highstandard, high standard, sample, low standard.7.4 Run the Analysis:7.4.1 Obtain measurements from all four collectors du
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