A handy method to monitor outputs from a pulsed light source and its   application to photomultiplier's rate effect studies
  In order to study photomultiplier's short-term gain stability at high counting rate, we constructed an LED pulsed light source and its output monitor system. For the monitor system, we employed a photon counting method using a photomultiplier as a monitor photon detector. It is found that the method offers a simple way to monitor outputs from a pulsed light source and that, together with an LED light source, it provides a handy way to investigate photomultiplier's rate effects. 
Y. Takeuchi, Y. Hemmi, H. Kurashige, Y. Matono, K. Murakami, T.   Nomura, H. Sakamoto, N. Sasao, M. Suehiro, Y. Fukushima, Y...