- Why does the fact that the number of photo-electrons is finite affect anything?
- I forgot what stochastic means, please enlighten me.
- Does "signal quantitation" mean the number of distinct waveforms coming out of the PMT?
- Why is it governed by the Poisson distribution?

The next sentence says, "The square root of the number of captured photo-electrons is approximately the standard deviation of the error distribution." Is this because it is Poisson?

Also, explain the following sentences to me please: "Q is a measurement of efficiency and has units of number of photo-electrons per unit fluorescence intensity. The lower the Q value, the higher the amount of relative counting error associated with the signal."

I will admit that the primary reason I don't understand this is that I slacked off in prob/stat classes and I also never really learned how a PMT works. Unfortunately now it's important for me to understand what's going on!