Year
2004
Abstract
The measurements presented in this paper show how passive time-correlation measurements with three scintillation detectors can be used to locate the position of a spontaneous fission source within a plane. The measurements allow the prediction of the measurement time for various intensity fission sources and various sized detectors at fixed locations within a room. The method relies on the simultaneous detection of two gamma rays from fission to define the time of fission, and the time of flight of neutrons to the third detector to define the distance to the source. Three detectors are required to locate fission sources in a plane. If the source is not located within the plane of three detectors, a fourth detector would be required. In these measurements, Cf-252 was used as a surrogate for plutonium.