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Dual Energy Analysis Using Phoswich Scintillation Detectors for Low-Level In-Vivo Counting

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2 Author(s)
Shapiro, E.G. ; University of California, Lawrence Livermore Laboratory Livermore, California 94550 ; Anderson, A.L.

Electronics developed for a whole body counting system analyze the pulse heights of signals from both the sodium iodide (NaI(Tl)) and cesium iodide (CsI(Na)) crystals of a phoswich scintillation detector. Pulse shape discrimination is used to determine the origin of the scintillation, NaI or CsI, while rejecting coincident Compton-scattered events and photomultiplier tube noise. Both energy spectra are accumulated simultaneously in separate memory quadrants of a multichannel analyzer. The system allows for low-energy (5 keV - 125 keV) x-ray analysis from the NaI(Tl) crystal and high-energy (100 keV - 2.5 MeV) x-ray or ¿-ray analysis from the CsI(Na) crystal. The discrimination system is better than 95% efficient over both energy ranges, with a low-energy (12-24keV) shielded background count of less than 2 cpm for a single 5-in.-diam phoswich detector. This system thus extends the detector's normal energy range by more than an order of magnitude.

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Nuclear Science, IEEE Transactions on  (Volume:21 ,  Issue: 1 )