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tschoonj / xraylib

A library for X-ray matter interaction cross sections for X-ray fluorescence applications
https://github.com/tschoonj/xraylib/wiki
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Questions on fluorescence crosssection #50

Closed licode closed 7 years ago

licode commented 7 years ago

I can get x-ray fluorescence cross section from either command line or online table http://ftp.esrf.eu/pub/scisoft/xraylib/xraylib_tables_v2.3.pdf.

However, I find the results are not the same for some elements. Take Ti as an example, I run the command line as 

In [17]: xraylib.CSb_FluorLine_Kissel(22,xraylib.KA1_LINE,8)
Out[17]: 1832.0522750085834

From page 40 in the table, I can get Ti KA1 line at 8KeV as two values (1.71e+03 1.79e+03). So the value from command line is larger than the values in the table. I thus got the following 2 questions.

  1. Can you please recommend which value I should use? Why are there two values in the table, from different models?

  2. I also see from the table that the second column shows values for Ka2,1. I assume that means sum of Ka1 and Ka2. Just double check.

Thanks!

tschoonj commented 7 years ago

The first page of the pdf states that it was generated in November 2003. You may be surprised to hear that there have been a couple of changes to xraylib in the meantime 😄

Please do not use that pdf. Rely only on the values generated by the last stable release.

licode commented 7 years ago

got it. thanks.