https://www.nist.gov/publications/mass-absorption-coefficient-tungsten-and-tantalum1450-ev-2350-ev-experiment-theory-and
Summary of the WERB approved article Mass Absorption Coefficient of Tungsten and Tantalum, 1450 to 2350 eV: Experiment, Theory, and Application by myself and 7
mass absorption coefficienttungstentantalumev