【英文标准名称】:StandardTestMethodforNondestructiveAssayofPlutoniuminScrapandWastebyPassiveNeutronCoincidenceCounting
【原文标准名称】:无源中子符合计数法测定废弃物中钚的无损检验的标准试验方法
【标准号】:ASTMC1207-2010
【标准状态】:现行
【国别】:
【发布日期】:2010
【实施或试行日期】:
【发布单位】:美国材料与试验协会(US-ASTM)
【起草单位】:C26.10
【标准类型】:(TestMethod)
【标准水平】:()
【中文主题词】:无损检验;无源中子符合计数;钚;废弃和废物;符合计数法;电测量;中子计数;无损评估-核应用;核废物和废弃材料;钚-核废物和废弃材料;热-中子符合计数
【英文主题词】:nondestructiveassay;passiveneutroncoincidencecounting;plutonium;scrapandwaste;Coincidencecounting;Electricalmeasurements;Neutroncounting;Nondestructiveevaluation(NDE)--nuclearapplications;Nuclearscrapandwastematerials;Plutonium--n
【摘要】:ThistestmethodisusefulfordeterminingtheplutoniumcontentofscrapandwasteincontainersrangingfromsmallcanswithvolumesoftheorderofamLtocratesandboxesofseveralthousandlitersinvolume.Acommonapplicationwouldbeto208-L(55-gal)drums.TotalPucontentrangesfrom10mgto6kg(1).Theupperlimitmayberestricteddependingonspecificmatrix,calibrationmaterial,criticalitysafety,orcountingequipmentconsiderations.ThistestmethodisapplicableforU.S.DepartmentofEnergyshipper/receiverconfirmatorymeasurements(9),nuclearmaterialdiversiondetection,andInternationalAtomicEnergyAgencyattributesmeasurements(10).Thistestmethodshouldbeusedinconjunctionwithascrapandwastemanagementplanthatsegregatesscrapandwasteassayitemsintomaterialcategoriesaccordingtosomeorallofthefollowingcriteria:bulkdensity,thechemicalformsoftheplutoniumandthematrix,americiumtoplutoniumisotopicratio,andhydrogencontent.Packagingforeachcategoryshouldbeuniformwithrespecttosize,shape,andcompositionofthecontainer.EachmaterialcategorymightrequirecalibrationstandardsandmayhavedifferentPumasslimits.Biasinpassiveneutroncoincidencemeasurementsisrelatedtoitemsizeanddensity,thehomogeneityandcompositionofthematrix,andthequantityanddistributionofthenuclearmaterial.Theprecisionofthemeasurementresultsisrelatedtothequantityofnuclearmaterial,the(x03B1;,n)reactionrate,andthecounttimeofthemeasurement.Forbothbenignmatrixandmatrixspecificmeasurements,themethodassumesthecalibrationreferencematerialsmatchtheitemstobemeasuredwithrespecttothehomogeneityandcompositionofthematrix,theneutronmoderatorandabsorbercontent,andthequantityofnuclearmaterial,totheextenttheyaffectthemeasurement.Measurementsofsmallercontainerscontainingscrapandwastearegenerallymoreaccuratethanmeasurementsoflargeritems.Itisrecommendedthatwherefeasiblemeasurementsbemadeonitemswithhomogeneouscontents.Heterogeneityinthedistributionofnuclearmaterial,neutronmoderators,andneutronabsorbershavethepotentialtocausebiasedresults.Thecoincidentneutronproductionratesmeasuredbythistestmethodarerelatedtothemassoftheevennumberisotopesofplutonium.Iftherelativeabundancesoftheseisotopesarenotaccuratelyknown,biasesinthetotalPuassayvaluewillresult.Typicalcounttimesareintherangeof300to3600s.Reliableresultsfromtheapplicationofthismethodrequiretrainingofthepersonnelwhopackagethescrapandwastepriortomeasurementandofpersonnelwhoperformthemeasurements.TrainingguidanceisavailablefromANSI15.20,Guides,C1009,C1068,andC1490.1.1Thistestmethoddescribesthenondestructiveassayofscraporwasteforplutoniumcontentusingpassivethermal-neutroncoincidencecounting.Thistestmethodprovidesrapidresultsandcanbeappliedtoavarietyofcarefullysortedmaterialsincontainersaslargeasseveralthousandlitersinvolume.Thetestmethodappliestomeasurementsof238Pu,240Pu,and242Puandhasbeenusedtoassayitemswhosetotalplutoniumcontentrangesfrom10mgto6kg(1).1.2Thistestmethodrequiresknowledgeoftherel......
【中国标准分类号】:Z33
【国际标准分类号】:13_030_30
【页数】:11P.;A4
【正文语种】: