We use the liquid scintillation detector with Si detector to detection UV radiation (generate from laser), this source is a vary the input power and number of. Pulses. The shape of pulse (rise time) is related with this two parameters. Expectation the increase of input optical power is lead to decay of the rise time and the increase of number of pulses no effective.
read this lecture:
https://www.hephy.at/fileadmin/user_upload/VO-5-Scintillators.pdf
If you see a slow down of the rise-time it is probably to do with two-photon absorption process. The light emitted usually should be proportional with the light you put in in a truly linear case. How do you detect the light coming out? The number of pulses will only have an impact if the separation of pulses is shorter than the decay time of the scintillator, otherwise you only take into account single pulse effect.
I hope this helps.
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