核辐射测量方法8（methods of nuclear radiation measurement 8）

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1、核辐射测量方法8（Methodsofnuclearradiationmeasurement8）ThisarticlebytheuniqueproductABCcontributionPptdocumentsmayexperiencepoorbrowsingontheWAPside.ItisrecommendedthatyoufirstselectTXT,ordownloadthesourcefiletothelocalview.Theeighthchapterisneutronmeasurement8.1neutronsourceMaincharacteristicso

2、f8.1.1neutronsource1neutronsourcestrengthNeutronsourcestrengthreferstothenumberofneutronsemittedperunittime,i.e.,neutronintensity.Ifonlyoneneutronisreleasedfromeachnuclearreaction,thesourcestrengthisequaltothenumberofnuclearreactionsoccurringinthetargetmaterialperunittime.2sourceenergyNe

3、utronsourceenergyistheneutronenergyemittedbyaneutronsource.NeutronenergyisusuallyreferredtoaskineticenergyBinaryhalflifein2Thehalf-lifeofasourcereferstothehalf-lifeofradioactiveisotopesemittedbybombardingparticles.8.1neutronsourceThetypeof8.1.2neutronsource1isotopeneutronsource1)neutrons

4、ource(alpha,n)neutronsourceRadiumberylliumsourcepoloniumberylliumneutronsourceamericiumberylliumneutronsourceofplutoniumberylliumneutronsourcespontaneousfissionneutronsource(2)~(252Cf)))(spontaneousfissionneutronsource8.1neutronsourceThetypeof8.1.2neutronsource2acceleratorneutronsourceTh

5、eenergyreleasedbytheT(D,n)4Hereactionisassignedtoneutronsandheliumnuclei3acceleratorneutronsourceNeutronsfromthissourcecomefromachainreactioninthereactor.8.1neutronsourceThetypeof8.1.2neutronsourceCommonneutronsourceandclassification8.2basicprinciplesandmethodsofneutrondetection8.2.1nucl

6、earreactionmethodNeutroncrosssectionsofthreenuclearreactionsof10B,6Li,and3He,andneutroncrosssectionsofthreenuclearreactions8.2basicprinciplesandmethodsofneutrondetection8.2.2nuclearrecoilmethodTheincidentenergyofEneutronsandnucleuselasticscattering,neutronmotiondirectionwillbechanged,ene

7、rgyhasbeenreduced,reducedneutronenergytothenucleus,thenuclearmotionatacertainspeed.Thenucleusiscalledarecoilnucleus".Therecoilnucleushasacertaincharge,whichcanberecordedaschargedparticles,andtherecoilnucleuscanberecordedtodetecttheneutron.Thismethodofdetectingneutronsisca