A scintillator crystal system whose output is monitored with a streak camera was developed to measure the times between a number of flash xhyphen;ray bursts used to radiograph dynamic mechanical events. Light flashes from NaI(Tl) crystals exposed to flash xhyphen;ray beams were conducted from the crystals through fiber optics bundles to the slit plane of a streak camera. The short duration of the xhyphen;ray and optical pulses allowed the streak camera to be run in the halfhyphen;slit mode. Separations of the resultant images along the time axis of the camera film were measured to determine the times between flash xhyphen;ray bursts to accuracies of 35 nsec.
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