  The proton light yield of organic scintillators has been measured extensively
in recent years using fast waveform digitizers and large discrepancies exist in
the values reported by different authors. In this letter, we address principles
of digital signal processing that must be considered when conducting
scintillator light yield measurements. Digitized waveform pulse height values
are only proportional to the amount of scintillation light if the temporal
shape of the scintillation pulse is independent of the amount of energy
deposited. This is not the case for scintillation pulses resulting from fast
neutron interactions in organic scintillators. Authors measuring proton light
yield should therefore report pulse integral values and ensure that the
integration length is long enough to capture most of the scintillation light.
