xrf 卓尚军 4

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1、XRFXRFXRFXRF谱仪结构与参数选择卓尚军中国科学院上海硅酸盐研究所无机材料分析测试中心2012-12-26S.ZhuoSICCAS2012-12-26S.ZhuoSICCASXRFXRF系统设计示意图2012-12-26S.ZhuoSICCASXRFXRF谱仪的结构图2012-12-26S.ZhuoSICCASSuperSharpEnd-WindowX-rayTube2012-12-26S.ZhuoSICCAS超锐管和透射靶管比较SuperSharpTubeTransmissionTarge

2、tTube2012-12-26S.ZhuoSICCASXX光管靶材的选择从×光菅发出的连续谱2012-12-26S.ZhuoSICCASCrCr靶XX光管2012-12-26S.ZhuoSICCASRhRh靶XX光管2012-12-26S.ZhuoSICCASXX光管电压的设定2012-12-26S.ZhuoSICCAS最佳XX光管电压设定kVkVKlinesKlinesLlinesLlines606026Fe-Fe-----56BaBa62SmSm----92UU505024CrCr----25M

3、nMn59PrPr----60NdNd404022Ti--Ti--23VV55CsCs----58CeCe303020Ca--Ca----21ScSc51Sb--Sb--53II24244Be--Be----19KK20Ca--Ca--50SnSnPW2400,SST菅,Rh靶2012-12-26S.ZhuoSICCASXX光管过滤片的用途•Removalofinterferingcharacteristictubelines•Improvementpeak/backgroundgivingLowe

4、rLLd’sfortraces•Attenuationofintensities•Supressionofspectralimpuritiesfromthetubespectrum2012-12-26S.ZhuoSICCASXX光管过滤片过滤片用途K系线范围Brass0.30mmRemovesRhKLinesImprovesSBR:20-…keV>45RhBrass0.10mmImprovesSBR:16-20keV40Zr-45RhAl0.75mmImprovesSBR:12-16keV35Br-

5、40ZrAl0.20mmRemovesRhLLinesImprovesSBR:4-12keV22Ti-34Se*SBR指信号与背景比2012-12-26S.ZhuoSICCAS0.3mm黄铜过滤片除去Rh靶的K系特征谱线2012-12-26S.ZhuoSICCAS0.750.75mmAlmmAl过滤片改善信背比2012-12-26S.ZhuoSICCASEnergyDispersiveXRFEnergyDispersiveXRF2012-12-26S.ZhuoSICCASEDXRFEDXRF的分辨率

6、•ComparedtoWDXRFresolutionis:–betterathighenergies(Ag/Sn/SbKspectra)–thesameatmediumenergies(Fe/Mn/CrKspectra)–worseatlowenergies(Na/Mg/Al/SiKspectra).2012-12-26S.ZhuoSICCASEDXRFEDXRF的优缺点△优点：•WithSi(li)detectorallelementsmeasuredsimultaneously.•Relativ

7、elyinexpensive.△缺点：•Poorresolutionforlightelements.•Maximumtotalcountrate(Σallelements)20000c/s.•Poorperformanceforlowlevelsoflightelements.•MayrequireliquidN2.2012-12-26S.ZhuoSICCASWavelengthWavelengthDispersiveDispersiveXRFXRF平晶扫描式2012-12-26S.ZhuoSIC

8、CASWavelengthWavelengthDispersiveDispersiveXRFXRF弯晶多道同时式2012-12-26S.ZhuoSICCAS准直器的使用SpacingApplication(µm)100VeryhighresolutionTeK-AsK&UL-PbL150HighresolutionU-K300HighintensityU-K550HighresolutionCl-F700HighintensityCl-F4000Be-O2012-12