Abstract
The concept of a multi-photomultiplier tube radiation detection system that electronically displays the image of the spatial distribution of radiation interactions within a thin scintillator has been developed. Small light-conducting fibers that address the surface of the scintillator correlated a particular spatial coordinate on the surface with a particular tube. Interactions which ultimately produce tube signals coincident between two tube groups gated the visual display of the system and electronic signals corresponding to the proper components of the display "dot" of each interaction were simultaneously provided to preserve each interaction's coordinates. In addition, an electronic system to veto a coincidence signal between the groups caused by more than one interaction was incorporated into the system. A counting theory consistent with the detection system and allowing the expression of individual tube signal rates and of entire system coincidence rates from individual photon considerations also has been developed for both two and three tube groups whose coincident output signals determine each interaction to be displayed. The generation of the two- and three-fold (or two and three tube group) accidental coincidence rates was also performed in terms of individual tube rates and detection efficiencies. The capabilities of the two-fold and three-fold detection modes of reducing the accidental coincidence rates with respect to their respective "real" coincidence rates were compared for both small and large detection efficiencies, resulting in these capabilities being dependent upon the average signal-to-noise ratio of the tubes as well as the efficiency values. ...
Hastings, Ronnie Jack (1972). Electronic assimilation of radiation imagery data. Texas A&M University. Texas A&M University. Libraries. Available electronically from
https : / /hdl .handle .net /1969 .1 /DISSERTATIONS -184583.