Figure 2.

(a) X‐ray attenuation is exponential within the scintillator, with absorption weighted toward the entrance plane z = 0. (b) Non‐uniform x‐ray absorption and light escape efficiency with depth result in a probability density function φ of the light output per x‐ray interaction. (c) Integrating φ with respect to ${\overline{N}}_{phe}$ [bounds represented by the shaded region in (b)] computes the cumulative distribution function $C({\overline{N}}_{phe})$, which may be related to the total x‐ray absorption from depth 0 to z.