FFAST.jl

Chantler's FFAST mass absorption coefficients
Author usnistgov
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September 2019

FFAST.jl

X-ray Mass Attenuation and Absorption Factors

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Implements in Julia an interpolation scheme for Chantler's FFAST X-Ray Form Factor, Attenuation, and Scattering Tables as downloaded from the NIST FFAST web site

Users should refer to the NIST website for a detailed discussion of the provenance of these values. In general, however, they are based on a self-consistent Dirac-Hartree-Fock framework. Interpolated values of the f1 and f2 components of the form factors, the photoelectric attenuation coefficient for the atom, [µ/ρ]pe, the coherent and incoherent attenuation coefficient, [μ/ρ]ci, the total mass absorption coefficient [μ/ρ]tot and the value for the K-shell, [µ/ρ]K are made available through exported functions.

In addition, exported functions provide access to other elemental data items including the mean atomic weight, the cross-section factors, the nominal density, E(V), the relativistic correction factors and the nuclear Thompson correction.

The tabulations are discussed in two references: