Fast Coincidence Circuit for Slow Pulses

A circuit is described which permits the timing of slow pulses (e.g., 300‐mμsec rise time) to good precision (e.g., ±3 mμsec) over a wide range of pulse heights (e.g., 6 v to 120 v) and at high counting rates (average separation $\text{≳4\hspace{0.17em}μ}\sec$ . This is useful particularly in coincidence spectroscopy with NaI(Tl) scintillators.