openmc.data.mass_energy_absorption_coefficient

openmc.data.mass_energy_absorption_coefficient(material: str | int, data_source: str = 'nist126') → Tabulated1D[source]

Return the mass energy-absorption coefficient as a function of energy.

The mass energy-absorption coefficient, \(\mu_\text{en}/\rho\), is defined as the fraction of incident photon energy absorbed in a material per unit mass less the energy carried away by scattered photons. It is obtained from NIST Standard Reference Database 126: X-Ray Mass Attenuation Coefficients.

Added in version 0.16.0.

Parameters:

  • material (str or int) – Material or element for which to load coefficients. A material name (currently only 'air'), element symbol (e.g., 'Fe'), or atomic number (e.g., 26) may be given.

  • data_source ({'nist126'}) – Source library.

Returns:

Mass energy-absorption coefficient [cm^2/g] as a function of photon energy [eV], using log-log interpolation.

Return type:

Tabulated1D