2. The Mass Attenuation Coefficient (source code)

= 2. The Mass Attenuation Coefficient
{c}
{tag=Work by John H. Hubbell}
{tag=Work by Stephen M. Seltzer}

https://pml.nist.gov/PhysRefData/XrayMassCoef/chap2.html

Cited passages: equations (1)–(3), mass thickness, and photon-energy dependence.