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

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Presentation transcript:

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 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

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

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

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

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

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

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

RobWin

PIXE Spectrum

Conclusions The elements found in the meteorites were : CaTiCr FeNiCu Zn GaAs

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.

The End