Figure 2.

Schematic of PET electronics used for prompts and randoms DAQ trigger generation. Starting from the top left, four pre-amp signals from a detector head are summed and fed into a CFD. Singles triggers ($\tau =6\mathrm{ns}$) are run through coincidence logic with no offset for prompts or delayed by 32 ns for one head for delayed coincidence trigger generation. Computer controlled NIM counters are used to estimate rates of singles for both heads ($S^c$), prompts ($P^c$), and delayed coincidences ($R^c$).