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Detection of coincident radiations in a single transducer by pulse shape analysis

United States Patent

7,342,231
March 11, 2008
View the Complete Patent at the US Patent & Trademark Office
Pulse shape analysis determines if two radiations are in coincidence. A transducer is provided that, when it absorbs the first radiation produces an output pulse that is characterized by a shorter time constant and whose area is nominally proportional to the energy of the absorbed first radiation and, when it absorbs the second radiation produces an output pulse that is characterized by a longer time constant and whose area is nominally proportional to the energy of the absorbed second radiation. When radiation is absorbed, the output pulse is detected and two integrals are formed, the first over a time period representative of the first time constant and the second over a time period representative of the second time constant. The values of the two integrals are examined to determine whether the first radiation, the second radiation, or both were absorbed in the transducer, the latter condition defining a coincident event.
Warburton; William K. (Menlo Park, CA), Tan; Hui (Newark, CA), Hennig; Wolfgang (Fremont, CA)
Warburton; William K. (Menlo Park, CA)
11/ 426,762
20070051892
June 27, 2006
STATEMENT AS TO RIGHTS TO INVENTIONS MADE UNDER FEDERALLY SPONSORED RESEARCH OR DEVELOPMENT The U.S. Government has rights in this invention pursuant to Contract No. DE-FG02-04ER84121 awarded by the Department of Energy.