Dear Michał,
In order to provide correct normalized percentages one would have to be
sure that all elements present in the sample are measured and that all
the measured elements actually come from the sample. Those conditions
cannot be warranted and the normalization cannot be applied. Therefore
to say 0.05 mass fraction or 5 % mass proportion is just a question of
taste and I do not see any added benefit.
Without going any further, in the steel example provided with PyMca, the
measured mass fractions for Cr, V, Fe, Ni and Mn are correct and, for
instance, to go from an Fe mass fraction of 0.64 to a 64 % concentration
does not require a huge effort. Furthermore, the sum of the mass
fractions of those elements amounts to 0.97. This particular case is
quite good, but a normalization to 100 % would modify the concentrations
of all the elements when in fact, the actual sample composition contains
more than 2 % of Mo that is not measured due to the used excitation energy.
Best regards,
Armando
On 21/07/2025 09:59, PyMca general purpose mailing list. wrote:
> Dear Armando,
>
> I use pyMCA to analyze elemental content in metal alloys. However,
> metallurgists are accustomed to using percentages instead of mass
> fractions. Would it be possible to add a switch to display the
> analysis result as a percentage?
>
> To obtain the result in percentages, I slightly modified the program
> code, but not everyone knows how to do this.
>
> Another interesting option would be the ability to normalize the
> results to 100%.
>
> ---
> Best regards,
> Michał Olejnik
> Poland
>
>
>
>
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