A fast single-channel pulse-height analyzer is described that employs a unique tunnel diode trigger circuit to generate accurately timed output pulses. The analyzer described herein was developed for use in nanosecond nuclear physics coincidence and lifetime studies and will handle approximately 10 random pulses per second above the lower discriminator level with negligible output pulse loss.nWith the radioactive isotope cobalt 60, which produces an essentially simultaneous (<10~ sec) two-gamma-ray cascade, two gamma-ray detectors consisting of plastic scintillator and photomultiplier tube, and two fast single-channel pulse-height analyzers, a resolution curve of 0. 57-nanosecond full width at half maximum height was obtained when the upper 25 percent of the cobalt 60 gamma-ray pulse-height spectrum produced in each of the gamma-ray detectors was used.
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