I have done XRF of aluminium foil because i have to find the contents and the percentage composition of Al foil.
Al foil is the standard foil used in food beverages etc. but i require 99% pure Al foil so could you please help to identify the percentage composition and contents from the data.
XRF graph attached.
if you convert the channel numbers in your graph to photon energy you can at least identify the fluorescence peaks and from that tell what elements are in your sample beside aluminium.
if you want to quantify how much or if it is 99% clean or not you have to know much more than that. you need all the instrumental parameters in order to be able to calculate the samples percentage or a proper calibration of youre instrument.
In your spectr Al K-alpha peak should fit to 1.48 keV. You have to do energy-channel calibration using some standarts with known at least 2 elements(peaks). Then perform measement and you will see what line of element match to the second intensive peak . Then quantitive analysis based on methodical approach of your instument's software ..
I think, you must know several parameters.
1- energy spectrum or calibration energy-channel.
2- the equipment used. (have you used the helium gas for increasing signal of light elements.
3- thickness of the aluminum foil (thin, medium or thick)
4- energy resolution and efficiency.
5-account for impurities during handling
And also you should think about the "peak" at max. energy, which most probably is due to signals exceeding the dynamic range of your spectrum either due to ADC/preamplifier settings or due to software. There could be relevant fluorescence peaks hidden there, i.e. atoms with higher Z and higher X-ray fluorescence energy.
For a thorough quantitative analysis you have to take into account the thickness of your foil and the energy spectrum of your excitation source and relate it to the impurity atoms type an their cross section.
Yes indeed you need to provide some more information as said before. Information on the general experimental setup, like used geometries, source parameters, sample parameters, ….
Mainly all the information you have, you will need.