ASTM C1428-2011 Standard Test Method for Isotopic Analysis of Uranium Hexafluoride by Single-Standard Gas Source Multiple Collector Mass Spectrometer Method《用单支标准气体源多收集器质谱仪法进行六氟化铀的.pdf
《ASTM C1428-2011 Standard Test Method for Isotopic Analysis of Uranium Hexafluoride by Single-Standard Gas Source Multiple Collector Mass Spectrometer Method《用单支标准气体源多收集器质谱仪法进行六氟化铀的.pdf》由会员分享,可在线阅读,更多相关《ASTM C1428-2011 Standard Test Method for Isotopic Analysis of Uranium Hexafluoride by Single-Standard Gas Source Multiple Collector Mass Spectrometer Method《用单支标准气体源多收集器质谱仪法进行六氟化铀的.pdf(5页珍藏版)》请在麦多课文档分享上搜索。
1、Designation:C142899 (Reapproved 2005) Designation: C1428 11Standard Test Method forIsotopic Analysis of Uranium Hexafluoride bySingleStandard Gas Source Multiple Collector MassSpectrometer Method1This standard is issued under the fixed designation C1428; the number immediately following the designat
2、ion indicates the year oforiginal 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 test method is applicable to
3、the isotopic analysis of uranium hexafluoride (UF6) with235U concentrations less than orequal to 5 % and234U,236U concentrations of 0.0010.0002 to 0.1 %.1.2 This test method may be applicable to the analysis of the entire range of235U isotopic compositions providing that adequatestandards are availa
4、ble. U isotopic compositions providing that adequate Certified Reference Materials (CRMs or traceablestandards) are available.1.3 This standard does not purport to address all of the safety concerns, if any, associated with its use. It is the responsibilityof the user of this standard to establish a
5、ppropriate safety health practices and determine the applicability of regulatory limitationsprior to use.2. Referenced Documents2.1 ASTM Standards:2C787 Specification for Uranium Hexafluoride for EnrichmentC996 Specification for Uranium Hexafluoride Enriched to Less Than 5 %235U2.2 Other Document:US
6、EC-651 Uranium Hexafluoride: A Manual of Good Handling Practices33. Summary of Test Method3.1 The unknown sample and a CRM or traceable standard whose isotopic composition is close to that of the sample areintroduced in sequence into the mass spectrometer, and234U,235U,236U, and238U ions are focused
7、 through correspondingcollector slits to the four separate collectors. Measurements are made that are proportional to the ratios of234U,235U, or236Uto238U. With the known composition of the CRM or traceable standard, these ratios of molar ratios permit calculation of the234U,235U, and236U contents.
8、Memory corrections are applied based on the periodic measurement of two CRMs or traceable standards.4. Significance and Use4.1 Uranium hexafluoride is a basic material used to produce nuclear reactor fuel. To be suitable for this purpose, the materialmust meet criteria for isotopic composition. This
9、 test method is designed to determine whether the material meets the requirementsdescribed in Specifications C787 and C996.5. Apparatus5.1 A gas source multiple collector mass spectrometer with the following attributes:5.1.1 The resolving power of the mass spectrometer is not less than 500. The reso
10、lving power (R) is calculated from theregistered mass spectrum of both the235UF5+and238UF5+isotopes as follows:R 5a Mb DM(1)1This test method is under the jurisdiction of ASTM Committee C26 on Nuclear Fuel Cycle and is the direct responsibility of Subcommittee C26.05 on Methods of Test.Current editi
11、on approved JuneMarch 1, 2005.2011. Published December 2005.April 2011. Originally approved in 1999. Last previous edition approved in 19992005 asC142899(2005). DOI: 10.1520/C1428-99R05.10.1520/C1428-11.2For referencedASTM standards, visit theASTM website, www.astm.org, or contactASTM Customer Servi
12、ce at serviceastm.org. For Annual Book of ASTM Standardsvolume information, refer to the standards Document Summary page on the ASTM website.3Available from Superintendent of Documents, U.S. Government Printing Office, Washington, D.C. 20402.3Available from United States Enrichment Corporation, 6903
13、 Rockledge Drive, Bethesda, MD 20817.1This document is not an ASTM standard and is intended only to provide the user of an ASTM standard an indication of what changes have been made to the previous version. Becauseit may not be technically possible to adequately depict all changes accurately, ASTM r
14、ecommends that users consult prior editions as appropriate. In all cases only the current versionof the standard as published by ASTM is to be considered the official document.Copyright ASTM International, 100 Barr Harbor Drive, PO Box C700, West Conshohocken, PA 19428-2959, United States.wherea = d
15、istance between centers of the235UF5+and238UF5+peaks,b = peak width of the238UF5+isotope (10 % valley),M = 333 mass(u)238UF5+, andDM = 3 = 333 330, 330 mass(u)235UF5+5.1.2 The abundance sensitivity of the mass spectrometer is specified as less than 13105as contribution of mass 333 (238UF5+)to mass 3
16、31 (236UF5+).5.1.3 The four collectors have collector slits adjusted for ions of masses 329, 330, 331, and 333. Ion currents are amplified byfour amplifiers, having noise level less than 0.5 mV.5.1.4 The ion beams are kept within the slits by an automatic beam positioner circuit.5.1.5 The pumping sy
17、stem of the mass spectrometer analyser tube shall maintain a pressure less than 53108torr with a sampleflowing into the ion source.5.1.6 The memory correction factor of the mass spectrometer as defined in 9.1 shall be consistent with the required accuracyand precision, and shall not exceed 1.01.1.00
18、5.5.1.7 The sample inlet system shall be equipped with a manifold, including adjustable leak, and valves for introducing thesample and CRM or traceable standard in sequence and for evacuating corresponding lines. The pumping system of the inletsystem must maintain a pressure less than 23102torr by e
19、vacuating.6. Hazards6.1 Since UF6is radioactive, toxic, and highly reactive, especially with reducing substances and moisture (see USEC-651),appropriate facilities and practices for analysis shall be provided.7. Calibration and Standardization7.1 Uranium Hexafluoride Isotopic7.1.1 Two CRMs or tracea
20、ble standards are used to determine the memory correction factor. The relative235U concentrationdifference of these standards shall not be more than 20%.7.1.2For memory correction factor determination forU concentration ratio of upper CRM or traceable standard ( C235SH)to235U of lower CRM ortraceabl
21、e standard ( C235SL) shall not be more than three ( C235SH/ C235SL# 3).7.1.2 For memory correction factor determination for234U and236U isotopes in concentration range 0.01 to 0.1%, twostandards are used which differ inU isotopes, two CRMs or traceable standards are used which differ in234U(236U) co
22、ncentration. The relativedifference shall not exceed two times; in concentration range 0.001 to 0.01%, the relative difference shall not exceed four times.7.1.3The standards used for measurements may differ inU) concentration. In concentration range 0.0002 to 0.01, C234 236!SH/ C234 236!SL# 8; in co
23、ncentrationrange 0.01 to 0.1, C234 236!SH/ C234 236!SL# 6.7.1.3 The CRMs or traceable standards used for measurements may differ in235U concentration from a sample, but the relativedifference shall not be more than 10%. The relative difference inU concentration from a sample. ( C235X) on condition t
24、hat C235SH/ C235X# 1.5 and C235X/ C235SL# 1.5. For234U(236U) concentration shall not exceed two times for the concentration range 0.001 to 0.01%, and shall not bemore than 50% for the concentration range 0.01 to 0.1%. U) isotopes, the following range limitations shall be used: 0.0002 to 0.01C234236!
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