A High-Resolution Recording System for Neutron Cross-Section Measurements Using an Underground Nuclear Explosive Source

A high-resolution data recording system has been developed as part of the Los Alamos program of time-of-flight neutron cross-section measurements that use an underground explosion source. Analog signals from detectors near the targets are fed through logarithmic amplifiers, displayed one-dimensionally on fast-phosphor cathode-ray tubes, and are recorded on photographic film moving at high velocity at right angles to the CRT spot motion. The system is capable of tenth-microsecond resolution over a span of milliseconds, and three percent accuracy over a five-decade dynamic range.