The active zone of the pixel is very thin, < 10 
m, so that
its volume is very small. Due to the very low energy needed to
create a free carrier pair, the charge generation is equivalent for
both SW and LW detectors, but the pixel geometry of the SW array
ensures that most of the particles cross only one pixel. After a hit
the responsivity of the pixel decays slowly to its previous value.
The decay time is the same as for transients due to IR flux
changes. The lower the illumination of the array, the longer the
decay time.