Statens strålevern UiO Biofysikk NTNU Biofysikk BIPM International metrology in the field of Ionizing Radiation NIST Attenuation Coefficients and Mass Energy-Absorption Coefficients from 1 keV to 20 MeV for Elements =1 to 92 and 48 Additional Substances of Dosimetric Interest. NIST Stopping-Power and Range Tables for Electrons, Protons, and Helium Ions.