Figure 7. Attenuation in Pm (Z = 61), represented by Im (f) = f₂. [µ/ρ] (in cm²/g) = f₂ (e/atom) × 2.902 09 × 10⁵. Experimental data from Saloman, Hubbell and Scofield [34]. The extended range plotted shows the insignificance of Rayleigh scattering for all but the highest energies plotted (where the contribution reaches 1 %). The lower energy behavior illustrates the increasing uncertainty at lower energies. The near-edge structure of the "New Result" follows qualitative expectations unlike all others shown.