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Detection of trace elements in meteorites using PIXE

Detection of trace elements in meteorites using PIXE. Presented by: Sasha dos-Santos. Goals. To determine the chemical composition of several meteorites To estimate the concentration of chemicals in PPM (parts per million). Particle Induced X-Ray Emission Spectrometry.

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Detection of trace elements in meteorites using PIXE

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  1. Detection of trace elements in meteorites using PIXE Presented by: Sasha dos-Santos

  2. Goals • To determine the chemical composition of several meteorites • To estimate the concentration of chemicals in PPM (parts per million)

  3. Particle Induced X-Ray Emission Spectrometry • A method of determining the chemical composition of a substance • Has been in use since the 1970s • Used in fields such as astrophysics, medicine, and environmental science

  4. Characteristic X-Rays

  5. Characteristic X-Rays

  6. Characteristic X-Rays

  7. Characteristic 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

  8. Experimental Setup • Van de Graaff Accelerator - this is the ion beam source

  9. Experimental Setup • Analyzing Magnet - Selects particles based on charge and mass

  10. Experimental Setup • PIXE Chamber - up to five samples can be placed in the chamber at a time

  11. Experimental Setup • Si-Li Drifted Detector - detects X-Rays and sends input to a multichannel analyzer

  12. RobWin • Used for Spectral Analysis • Mathematically models background radiation (noise) • Finds peaks that are not clearly visible

  13. RobWin

  14. PIXE Spectrum

  15. PIXE Spectrum

  16. PIXE Spectrum

  17. Conclusions • The elements found in the meteorites were : Ca Ti Cr Fe Ni Cu Zn Ga As

  18. Conclusions • Next step is to use a process called spin coating to produce thin film samples • Then use thin film standards to determine chemical concentrations in the order of micrograms / sq. cm.

  19. The End

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