1、Designation:C88803(Reapproved 2014)Standard Specification forNuclear-Grade Gadolinium Oxide(Gd2O3)Powder1This standard is issued under the fixed designation C888;the number immediately following the designation indicates the year oforiginal adoption or,in the case of revision,the year of last revisi
2、on.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 specification provides the chemical and physicalrequirements for nuclear-grade gadolinium oxide powder in-tended for subsequent p
3、rocessing and use in nuclear fuelapplications,for example,as an addition to uranium dioxide.1.2 This specification does not include requirements forhealth and safety.Observance of this specification does notrelieve the user of the obligation to be aware of and complywith all federal,state,and local
4、regulations pertaining topossessing,shipping,processing,or using this material.1.3 The values stated in SI units are to be regarded asstandard.No other units of measurement are included in thisstandard.2.Referenced Documents2.1 ASTM Standards:2B329 Test Method for Apparent Density of Metal Powdersan
5、d Compounds Using the Scott VolumeterC493 Test Method for Bulk Density and Porosity of Granu-lar Refractory Materials by Mercury Displacement(Dis-continued 2002)(Withdrawn 2002)3C859 Terminology Relating to Nuclear MaterialsC889 Test Methods for Chemical and Mass SpectrometricAnalysis of Nuclear-Gra
6、de Gadolinium Oxide(Gd2O3)PowderE11 Specification for Woven Wire Test Sieve Cloth and TestSievesE105 Practice for Probability Sampling of Materials2.2 ANSI Standard:ANSI/ASME NQA-1 Quality Assurance Requirements forNuclear Facility Applications42.3 U.S.Government Document:Code of Federal Regulations
7、,Title 10,Part 50 Energy(10CFR 50),Domestic Licensing of Production and Utiliza-tion Facilities53.Terminology3.1 Definitions of Terms Specific to This Standard:3.1.1 Terms shall be defined in accordance with Terminol-ogy C859 except as defined herein.3.1.1.1 buyerthe organization issuing the purchas
8、e order.3.1.1.2 powder lota quantity of gadolinium oxide powderthat has been processed in a manner such that samples taken inaccordance with the procedures of 8.1 can be considered asrepresentative of the entire powder lot.3.1.1.3 sellerthe gadolinium oxide powder supplier.4.Ordering Information4.1
9、The buyer shall specify the following information for allorders where this specification applies:4.1.1 Powder lot size(allowable range),4.1.2 Quantity(weight of delivered product),4.1.3 Nominal particle size range and applicable tolerancesin accordance with Specification E11,4.1.4 Density(optional),
10、Scott Volumeter(Test MethodB329)and Mercury Displacement(Test Method C493)arereferenced as guides to density measurement techniques,4.1.5 Shape factor and method of determination(optional),4.1.6 Sampling requirements,4.1.7 Crystal structure(optional),and4.1.8 Quality requirements.1This specification
11、 is under the jurisdiction of ASTM Committee C26 onNuclear Fuel Cycle and is the direct responsibility of Subcommittee C26.03 onNeutron Absorber Materials Specifications.Current edition approved Jan.1,2014.Published February 2014.Originallyapproved in 1978.Last previous edition approved in 2008 as C
12、888 03(2008).DOI:10.1520/C0888-03R14.2For 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.3The last approved version of
13、 this historical standard is referenced onwww.astm.org.4Available from American National Standards Institute(ANSI),25 W.43rd St.,4th Floor,New York,NY 10036,http:/www.ansi.org.5Available from U.S.Government Printing Office Superintendent of Documents,732 N.Capitol St.,NW,Mail Stop:SDE,Washington,DC
14、20401,http:/www.access.gpo.gov.Copyright ASTM International,100 Barr Harbor Drive,PO Box C700,West Conshohocken,PA 19428-2959.United States1 5.Chemical Composition5.1 Loss-on-IgnitionThe loss-on-ignition as determinedafter ignition for 2 h at a minimum temperature of 900C shallnot exceed 1.5 weight%
15、.5.2 Gadolinium Oxide ConcentrationThe minimumGd2O3concentration shall be 99.8 weight%exclusive of theconstituents lost on ignition as determined by Test MethodsC889.5.2.1 Gadolinium Oxide Isotope ConcentrationThe isoto-pic concentration of the gadolinium shall be that which isfound in naturally occ
16、urring gadolinium for the followingisotopes:IsotopeAtomic%155Gd14.9 1.0157Gd15.7 1.05.3 Impurity Content:5.3.1 Individual Impurity LimitsIndividual impurities ex-clusive of constituents lost on ignition shall not exceed thefollowing limits:ElementMaximumConcentration(g/g Gd2O3)Boron5Cadmium25Thorium30(Chlorine+fluorine)100(Europium+samarium+terbium+ytterbium+dysprosium)1000Carbon6005.3.2 The buyer may specify individual impurity limits forany elements not listed in 5.3.1.Any identified impuritye
