Plastic Scintillator Calculation
Below is the calculations done to determine the probability of pair production depending on thickness of the scintillator.
Molecules per volume [math]\displaystyle{ = \frac{grams CH_{2}}{cm^3} * \frac{mol}{gram} * \frac{N[A]}{mol} }[/math]
Weighted Cross-section [math]\displaystyle{ = (/sigma_elec CH_{2} }[/math]