openmc.data.atomic_mass

openmc.data.atomic_mass(isotope)

Return atomic mass of isotope in atomic mass units.

Atomic mass data comes from the Atomic Mass Evaluation 2012, published in Chinese Physics C 36 (2012), 1287–1602.

Parameters:isotope (str) – Name of isotope, e.g. ‘Pu239’ Returns:Atomic mass of isotope in atomic mass units. If the isotope listed does not have a known atomic mass, None is returned. Return type:float or None