Re: [PyMca] background calculation

[PyMca g. p. m. list. <pym...@li...>]

Dear Armando,

Thanks a lot for clarifying  the information that the fit file has to offer.
Just a kind suggestion, perhaps this is something other users would find
useful and could be implemented  to the Table tab in the advanced fit
window in a future update.

Anyway Thanks again for your valuable help.

Tasos

Στις Τρί 12 Δεκ 2023 στις 2:32 μ.μ., ο/η PyMca general purpose mailing
list. <pym...@li...> έγραψε:

> Dear Tasos,
>
> There are several ways to achieve your goal. Personally I prefer to use
> the Matrix Spectrum under the actual experimental conditions as described
> in the exercises.
>
> If you generate the .fit file (for instance together with the HTML
> report), you will get in it things like:
>
> [result.Ca K]
> fitarea = 131.78478962249625
> sigmaarea = 13.85115166026227
> statistics = 147.03684094891193
> mcaarea = 132.26618660507341
> peaks = KL3, KM3
> escapepeaks = KL3 Ge_L2M4, KL3 Ge_L3M5, KL3 Ge_L2M1, KL3 Ge_L3M1, KM3
> Ge_L2M4, KM3 Ge_L3M5, KM3 Ge_L2M1, KM3 Ge_L3M1
>
> Where:
>
> - fitarea and sigmaarea are coming from the fit
> - statistics give you the total number of counts in the region occupied by
> the element peaks
> - mcaarea is the area obtained subtracting the background from the
> statistics. Background covering baseline, contribution from other elements
> and long and step tails (if any) of the fitted element.
>
> If you want a single number for the background, you can subtract the
> fitarea or the mcaarea to the statistics.
>
> Best regards,
>
> Armando
>
> On 12/12/2023 11:31, PyMca general purpose mailing list. wrote:
>
> Hello Armando thank you for immediate answer,
>
> Well I am trying to calculate some LoD for an instrument using a nist
> glass and when I fit the spectrum I get the net area of each element
> present but i can't find a way to calculate the background under each peak.
> Since I have for example traces of  Mn, Fe,Co,Ni,Cu,Zn etc., peaking a roi
> would give me the roi background and I was wondering if I can access the
> info (number) about background under each peak that I see pymca attributes
> in the peaks spectrum tab.
>
> I hope this helps.
>
> Tasos
>
> Στις Τρί 12 Δεκ 2023 στις 12:19 μ.μ., ο/η PyMca general purpose mailing
> list. <pym...@li...> έγραψε:
>
>> Hello,
>>
>> I guess you will have to detail a bit more your use case. PyMca is
>> systematically doing that.
>>
>> Best regards,
>>
>> Armando
>>
>> On 12/12/2023 09:46, PyMca general purpose mailing list. wrote:
>> > Hello,
>> >
>> > I would like to ask if there is a way that Pymca calculates the
>> > background under a peak?
>> > I suppose you could take a roi and check but since i have overlapping
>> > peaks in some areas that wouldn't fit my purpose.
>> >
>> > Thanks a lot for your help and great work!
>> >
>> > Tasos
>>
>>
>>
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