Since the T 0-T 0 interaction takes time, the scintillation light is delayed : this is the slow or delayed component ( corresponding to delayed fluorescence ).
2.
A "'scintillator "'is a material that exhibits metastable, so the relaxation back down from the excited state to lower states is delayed ( necessitating anywhere from a few nanoseconds to hours depending on the material ) : the process then corresponds to either one of two phenomena, depending on the type of transition and hence the wavelength of the emitted optical photon : delayed fluorescence or phosphorescence, also called after-glow.
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