  A scintillator is a material which converts incoming ionizing energy into
visible light. This conversion process, which is a strongly nonlinear one, can
be described by a Reaction-Diffusion-Drift equation we obtain from a model of
continua with microstructure endowed with a suitable thermodynamics. For such
an equation it can be show the global existence of renormalizable and weak
solutions, and the solutions exponential decay estimates can be given; moreover
we give also a mathematical definition for the light yield which is a measure
of scintillation efficiency.
