ASTM_C_1133_-_C_1133M_-_10.pdf

Designation:C1133/C1133M10Standard Test Method forNondestructive Assay of Special Nuclear Material in Low-Density Scrap and Waste by Segmented Passive Gamma-Ray Scanning1This standard is issued under the fixed designation C1133/C1133M;the number immediately following the designation indicates the yearof original adoption or,in the case of revision,the year of last revision.A number in parentheses indicates the year of last reapproval.A superscript epsilon()indicates an editorial change since the last revision or reapproval.1.Scope1.1 This test method covers the transmission-corrected non-destructive assay(NDA)of gamma-ray emitting specialnuclear materials(SNMs),most commonly235U,239Pu,and241Am,in low-density scrap or waste,packaged in cylin-drical containers.The method can also be applied to NDA ofother gamma-emitting nuclides including fission products.High-resolution gamma-ray spectroscopy is used to detect andmeasure the nuclides of interest and to measure and correct forgamma-ray attenuation in a series of horizontal segments(collimated gamma detector views)of the container.Correc-tions are also made for counting losses occasioned by signalprocessing limitations(1-3).21.2 There are currently several systems in use or underdevelopment for determining the attenuation corrections forNDA of radioisotopic materials(4-8).A related technique,tomographic gamma-ray scanning(TGS),is not included inthis test method(9,10,11).1.2.1 This test method will cover two implementations ofthe Segmented Gamma Scanning(SGS)procedure:(1)IsotopeSpecific(Mass)Calibration,the original SGS procedure,usesstandards of known radionuclide masses to determine detectorresponse in a mass versus corrected count rate calibration thatapplies only to those specific radionuclides for which it iscalibrated,and(2)Efficiency Curve Calibration,an alternativemethod,typically uses non-SNM radionuclide sources todetermine system detection efficiency vs.gamma energy andthereby calibrate for all gamma-emitting radionuclides ofinterest(12).1.2.1.1 Efficiency Curve Calibration,over the energy rangefor which the efficiency is defined,has the advantage ofproviding calibration for many gamma-emitting nuclides forwhich half-life and gamma emission intensity data are avail-able.1.3 The assay technique may be applicable to loadings up toseveral hundred grams of nuclide in a 208-L 55-gal drum,with more restricted ranges to be applicable depending onspecific packaging and counting equipment considerations.1.4 Measured transmission values must be available for usein calculation of segment-specific attenuation corrections at theenergies of analysis.1.5 A related method,SGS with calculated correction fac-tors based on item content and density,is not included in thisstandard.1.6 The values stated in either SI units or inch-pound unitsare to be regarded separately as standard.The values stated ineach system may not be exact equivalents;therefore,eachsystem shall be used independently of the other.Combiningvalues from the two systems may result in non-conformancewith the standard.1.7 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 and health practices and determine the applica-bility of regulatory limitations prior to use.Specific precau-tionary statements are given in Section 10.2.Referenced Documents2.1 ASTM Standards:3C1030 Test Method for Determination of Plutonium IsotopicComposition by Gamma-Ray Spectrometry1This test method is under the jurisdiction ofASTM Committee C26 on NuclearFuel Cycle and is the direct responsibility of Subcommittee C26.10 on NonDestructive Assay.Current edition approved Jan.1,2010.Published February 2010.Originallyapproved in 1996.Last previous edition approved in 2003 as C1133 03.DOI:10.1520/C1133_C1133M-10.2The boldface numbers in parentheses refer to the list of references at the end ofthis test method.3For 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.Copyright ASTM International,100 Barr Harbor Drive,PO Box C700,West Conshohocken,PA 19428-2959.United States1 C1128 Guide for Preparation of Working Reference Materi-als for Use in Analysis of Nuclear Fuel Cycle MaterialsC1156 Guide for Establishing Calibration for a Measure-ment Method Used to Analyze Nuclear Fuel Cycle Mate-rialsC1207 Test Method for Nondestructive Assay of Plutoniumin Scrap and Waste by Passive Neutron CoincidenceCountingC1210 Guide for Establishing a Measurement System Qual-ity Control Program for Analytical Chemistry Laborato-ries Within the Nuclear IndustryC1215 Guide for Preparing and Interpreting Precision andBias Statements in Test Method Standards Used in theNuclear IndustryC1316 Test Method for Nondestructive Assay of NuclearMaterial in Scrap a