Abstract
Abstract A three crystal detector system has been fabricated and evaluated in conjuction with a 4096 channel multiparameter analyzer for multidimensional gamma-ray spectrometry. The detector system consists of two 4 inch thick by 6 inch diameter NaI(Tl) crystals which are contained in the center hole of an annular NaI(Tl) crystal of 11 1 2 inches diameter by 12 inches thick. The spectrometer utilizes the gamma-ray decay characteristics of each radionuclide for its identification and measurement by viewing the sample with two detectors and cancelling those events not totally absorbed in these principal detectors with a third detector which serves as an anticoincidence annulus. Coincidence counts are stored according to the photon energies responsible for the event in the energy-energy plane of the memory while non-coincidence events are stored in the normal manner. For triple coincidence spectrometry the three detectors view the source and the coincidence spectrum of any two can be recorded while the third detector serves as the coincidence monitor. Measurements of the system's counting efficiency, and of factors affecting its background, Compton and backscatter response are discussed along with some applications of the instrument.
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