Patent ID: 8624192

Claim:
A system for controlling photomultiplier gain rift, the system comprising: first means for separating an intrinsic noise pulse signal (Sb) of the photomultiplier from a useful signal (Su) output from the photomultiplier, the first means being configured to measure the intrinsic noise pulse signal, and to output a measurement signal representative of the photomultiplier's intrinsic noise pulse signal; and second means for maintaining the photomultiplier's intrinsic noise pulse signal at a constant level, based on the measurement signal, wherein the first means includes: an integrator having an input and an output, the integrator including an amplifier connected in parallel to a condenser and a first switch; and a discriminator having an input connected to the input of the integrator, a first output of the discriminator driving the first switch and a second output of the discriminator driving a second switch, one input of the second switch being connected to the output of the integrator.