新编文档-DetectionoftraceelementsinmeteoritesusingPIXE用PIXE陨石中微量元素检测-精品文档

1、Detection of trace elements inmeteorites using PIXEPresented by:Sasha dos-SantosGoals To detennine the chemical composition of several meteorites To estimate the concentration of chemicals in PPM (parts per million)Particle Induced X-Ray EmissionSpectrometry A method of detennining the chemical comp

2、osition of a substance Has been in use since the 1970s Used in fields such as astrophysics, medicine, and environmental scienceCharacteristic X-Rays The energy of the X-Ray is equal to the energy difference between the two orbitals This energy is characteristic of the element involved Analyzing Magn

3、et - Selects particles based on charge and mass PIXE Chamber up to five samples can be placed in the chamber at a time Si-Li Drifted Detector - detects X-Rays and sends input to a multichannel analyzerRobWin Used for Spectral Analysis Mathematically models background radiation (noise) Finds peaks th

4、at are not clearly visible1043 M dev Ch-Soudre for soectruffi 566Beonrwig cftannec 42Ending cAarrel10310*10°Vaca Muertal (Stony-Iron MES)1=001000000100000 -10000 -Huckitta (Stony-Iron PAL)-00or00-odiFejnJIJLSahara 00748 (Stone)SIU7OO00T3519217911131517Energy (keV)Conclusions The elements found in the meteorites were :CaTiCrFeNiCuZnGaAsConclusions Next step is to use a process called spin coating to produce thin film samples Then use thin film standards to deten