Abstract
A multidimensional gamma-ray spectrometer has been fabricated using two 11″ in dia. × 6″ thick NaI(Tl) crystals which are shielded from their phototubes with 4-inch thick pure NaI light pipes. Each NaI(Tl) crystal is surrounded by a 36″ in dia. × 18″ thick plastic phosphor which functions as an anticoincidence shield. The spectrometer is coupled to a 4096 channel multiparameter analyzer and uses the gamma-ray decay characteristics of each radionuclide for its identification and measurement. This is accomplished by viewing the sample with two NaI(Tl) detectors operating in coincidence and cancelling those events not totally absorbed in the principal detectors by the plastic phosphor anticoincidence annulus. Coincidence counts are stored in the energy-energy plane of the memory according to their photon energies, while single gamma-rays which interact with either crystal are stored in a normal manner on the X or Y axis. The axis and energy-energy plane backgrounds, backscatter effects, with some instrument applications.
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