外束PIXE束流均匀性测量与改善
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摘要
外束PIXE束流均匀性是对非均匀性样品进行PIXE定量分析的基础.利用IP板对北京师范大学GIC4117 2×1.7 MV串列加速器外束PIXE束流均匀性进行了测量.通过在准直光栏前改用5μm的铝箔散焦膜,并用刀口厚度仅为0.1mm的铝准直光栏代替原有的碳准直光栏,改善前外束PIXE束流中心直径3.6mm内的离散程度为-65%~50%,改善后为-4.9%~2.8%.改善后的PIXE可直接用于Tisch安德森8级气溶胶采样器样品的元素定量分析,以及PIXE公司的分级式撞击采样仪第1~7级样品的元素定量分析.
Beam uniformity is essential for quantitative analysis of heterogeneous samples by external beam particle-induced X-ray emission(PIXE).Imaging Plate(IP)was employed to beam uniformity measurement in external beam PIXE.A 5μm-thick aluminum scattering foil was used to defocuse in front of collimators.Graphite collimators were replaced with 0.1 mm-thick aluminum collimators.Dispersion degree of beam was improved from-65%-50%to-4.9%-2.8% with a diameter of 3.6 mm.The upgraded external beam PIXE setup can be directly used for quantitative analysis of samples collected by Tisch Anderson cascade impactors,and it can be directly used for quantitative analysis from 2 to 8 stage for samples collected by PIXE International cascade impactors.
Beam uniformity is essential for quantitative analysis of heterogeneous samples by external beam particle-induced X-ray emission(PIXE).Imaging Plate(IP)was employed to beam uniformity measurement in external beam PIXE.A 5μm-thick aluminum scattering foil was used to defocuse in front of collimators.Graphite collimators were replaced with 0.1 mm-thick aluminum collimators.Dispersion degree of beam was improved from-65%-50%to-4.9%-2.8% with a diameter of 3.6 mm.The upgraded external beam PIXE setup can be directly used for quantitative analysis of samples collected by Tisch Anderson cascade impactors,and it can be directly used for quantitative analysis from 2 to 8 stage for samples collected by PIXE International cascade impactors.
引文
[1]ZHANG B,PAN B H,ZHANG Z Q,et al.PIXE study on ancient pottery from Chinese Sanxia area[J].Nuclear Instruments and Methods in Physics Research B,2004,219/220:26
[2]VENKATESWARA RAO R,VENKATESWARULU P,KASIPATHI C,et al.Trace elemental analysis of Indian natural moonstone gems by PIXE and XRD techniques[J].Applied Radiation and Isotopes,2013,82:211
[3]徐亚,仇猛淋,郑晨龙,等.北京市夏季大气气溶胶PM2.5和PM10成分特征[J].北京师范大学学报(自然科学版),2015,51(4):362
[4]徐亚,郑晨龙,田平,等.北京市夏季大气不同粒径气溶胶中碳质及质量重建研究[J].北京师范大学学报(自然科学版),2015,51(3):241
[5]XU M,CHU Y J,WANG G F,et al.An upgraded external beam PIXE setup for multielemental analysis of atmospheric aerosol samples[J].X-ray Spectrometry,2018,47:79
[6]张华顺.离子源和大功率中性束源[M].北京:原子能出版社,1987:322
[7]GONZALEZ A L,LI H,MITCH M,et al.Energyresponse of an imaging plate exposed to standard beta sources[J].Applied Radiation&Isotopes Including Data Instrumentation&Methods for Use in Agriculture Industry&Medicine,2002,57(6):875
[8]MANCIC A,FUCHS J,ANTICI P,et al.Absolute calibration of photostimulable image plate detectors used as(0.5-20 MeV)high-energy proton detectors[J].Review of Scientific Instruments,2008,79(7):412
[9]TANAKA K A,YABUUCHI T,SATO T,et al.Calibration of imaging plate for high energy electron spectrometer[J].Review of Scientific Instruments,2005,76:572
[10]朱光华,汪新福,沈新尹.两次PIXE国际横向比对分析结果[J].核技术,1993,16(10):610
[11]TAKAHASHI K,KOHDA K,MIYAHARA J.Mechanism of photostimulated luminescence in BaFX:Eu2+(X=C1,Br)phosphors[J].Journal of Luminescence,1984,31/32:266
[12]TAKAHASHI K,MIYAHARA J,SHIBAHARA Y.Photostimulatedluminescence(PSL)and color centers in BaFX:Eu2+(X=Cl,Br,I)phosphors[J].Journal of the Electrochemical Society,1985,132:1492
[13]TAKAHASHI K.Progress in science and technology on photostimulable BaFX:Eu 2+,(X=Cl,Br,I)and imaging plates[J].Journal of Luminescence,2002,100:307
[14]XU Y,XU M,WANG G F,et al.Beam charge integration in external beam PIXE-PIGE analysis utilizing proton backscattering by an extraction window[J].Nuclear Science and Techniques.2016,27:137
[15]CALZOLAI G,CHIARI M,ORELLANA I G,et al,The new external beam facility for environmental studies at the Tandetron accelerator of LABEC[J].Nuclear Instruments and Methods in Physics Research B,2006,249(1/2):928
[2]VENKATESWARA RAO R,VENKATESWARULU P,KASIPATHI C,et al.Trace elemental analysis of Indian natural moonstone gems by PIXE and XRD techniques[J].Applied Radiation and Isotopes,2013,82:211
[3]徐亚,仇猛淋,郑晨龙,等.北京市夏季大气气溶胶PM2.5和PM10成分特征[J].北京师范大学学报(自然科学版),2015,51(4):362
[4]徐亚,郑晨龙,田平,等.北京市夏季大气不同粒径气溶胶中碳质及质量重建研究[J].北京师范大学学报(自然科学版),2015,51(3):241
[5]XU M,CHU Y J,WANG G F,et al.An upgraded external beam PIXE setup for multielemental analysis of atmospheric aerosol samples[J].X-ray Spectrometry,2018,47:79
[6]张华顺.离子源和大功率中性束源[M].北京:原子能出版社,1987:322
[7]GONZALEZ A L,LI H,MITCH M,et al.Energyresponse of an imaging plate exposed to standard beta sources[J].Applied Radiation&Isotopes Including Data Instrumentation&Methods for Use in Agriculture Industry&Medicine,2002,57(6):875
[8]MANCIC A,FUCHS J,ANTICI P,et al.Absolute calibration of photostimulable image plate detectors used as(0.5-20 MeV)high-energy proton detectors[J].Review of Scientific Instruments,2008,79(7):412
[9]TANAKA K A,YABUUCHI T,SATO T,et al.Calibration of imaging plate for high energy electron spectrometer[J].Review of Scientific Instruments,2005,76:572
[10]朱光华,汪新福,沈新尹.两次PIXE国际横向比对分析结果[J].核技术,1993,16(10):610
[11]TAKAHASHI K,KOHDA K,MIYAHARA J.Mechanism of photostimulated luminescence in BaFX:Eu2+(X=C1,Br)phosphors[J].Journal of Luminescence,1984,31/32:266
[12]TAKAHASHI K,MIYAHARA J,SHIBAHARA Y.Photostimulatedluminescence(PSL)and color centers in BaFX:Eu2+(X=Cl,Br,I)phosphors[J].Journal of the Electrochemical Society,1985,132:1492
[13]TAKAHASHI K.Progress in science and technology on photostimulable BaFX:Eu 2+,(X=Cl,Br,I)and imaging plates[J].Journal of Luminescence,2002,100:307
[14]XU Y,XU M,WANG G F,et al.Beam charge integration in external beam PIXE-PIGE analysis utilizing proton backscattering by an extraction window[J].Nuclear Science and Techniques.2016,27:137
[15]CALZOLAI G,CHIARI M,ORELLANA I G,et al,The new external beam facility for environmental studies at the Tandetron accelerator of LABEC[J].Nuclear Instruments and Methods in Physics Research B,2006,249(1/2):928