Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Accurate experimental determination of Gallium K- and L3-shell XRF
  fundamental parameters   The fluorescence yield of the K- and L3-shell of gallium was determined using
the radiometrically calibrated (reference-free) X-ray fluorescence
instrumentation at the BESSY II synchrotron radiation facility. Simultaneous
transmission and fluorescence signals from GaSe foils were obtained, resulting
in K- and L3-shell fluorescence yield values consistent with existing database
values(omega_Ga_K=0.515 +- 0.019, omega_Ga_L3=0.013 +- 0.001). For the first
time, these standard combined uncertainties are obtained from a properly
constructed Uncertainty Budget. These K-shell fluorescence yield values support
Bambynek's semi-empirical compilation from 1972: these and other measurements
yield a combined recommended value of omega_Ga_K=0.514 +- 0.010. Using the
measured fluorescence yields together with production yields from reference
Ga-implanted samples where the quantity of implanted Ga was determined at 1.3%
traceable accuracy by Rutherford backscattering spectrometry, the K-shell and
L3-subshell photoionization cross sections at selected incident photon energies
were also determined and compared critically with the standard databases.

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The categories of this paper are: astro-ph
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The categories of this paper are: chao-dyn
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The categories of this paper are: math
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The categories of this paper are: hep-ph
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The categories of this paper are: hep-ex
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The categories of this paper are: econ
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The categories of this paper are: eess
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The categories of this paper are: supr-con
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The categories of this paper are: q-fin
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The categories of this paper are: atom-ph
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The categories of this paper are: bayes-an
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The categories of this paper are: acc-phys
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The categories of this paper are: chem-ph
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The categories of this paper are: funct-an
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The categories of this paper are: q-alg
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The categories of this paper are: cs