Scintillator

An additive with a nonzero quantum efficiency is treated as a scintillator. The light yield for an ionizing particle is computed as:

$$N_{\rm photons} = \textrm{Concentration} \times \mathrm{QE} \times dE \frac{1}{1 + B * dE/dx}$$ (13.12)

where $dE$ is the energy deposition of the particle, $dx$ is the track length, $B$ is the Birks' constant for the additive, and $QE$ is the quantum efficiency for the additive.

Scintillation light is created during particle transport in the EGS4_AUSGAB1 routine, similarly to the Cherenkov light, and is packed in scintillation photon vertex bundles (SVBs, analagous to CVBs). The photons themselves are treated just like other Cherenkov photons.