Estimating the absolute flux distribution for a synchrotron X-ray beam using ionization-chamber measurements with various filters

Stevenson, A.W.; Di Lillo, F.

doi:10.1107/S1600577517009274

Journal of Synchrotron Radiation Journal of
Synchrotron Radiation

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Figure 2
Calculated, normalized flux curves, based on (5)

, for demonstration purposes. The peak position (E_peak) has been set to 60 keV (marked by the dashed vertical line), and m_low = m_high = 1 (Lorentzian), 2 (modified Lorentzian) and $[\infty]$ (Gaussian) as indicated. $[{\omega_{\rm{low}}}]$ has been chosen so that F_low = 20 keV, and $[{\omega_{\rm{high}}}]$ so that F_high = 80 keV, in each case, i.e. $[\beta]$ = 4 and F = 50 keV. The damping function has the form exp(−const./E³), with the constant selected so that the function's value at 60 keV (E_peak) is e^-1. The chosen form of the damping function incorporates the energy dependence associated with a linear absorption coefficient, photoelectric absorption being the dominant X-ray attenuation mechanism at the lower energies being considered here.

JOURNAL OF
SYNCHROTRON
RADIATION

ISSN: 1600-5775

Volume 24| Part 5| September 2017| Pages 939-953

https://doi.org/10.1107/S1600577517009274

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