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.