Abstract
A beta-gamma-gamma multidimensional spectrometer has been developed which employs two 12″' diameter by 8″' thick NaI(Tl) crystals with associated 4″' thick NaI light pipes and two 5″' diameter by 1 2 ″' thick gas proportional counters as principal detectors. The system utilizes two 40″' diameter by 24″' thick plastic phosphors as active anticoincidence shields in addition to four inches of borated paraffin and four inches of lead as passive shields. The detector system is coupled to two 4096 word computer memories which record gamma-ray events in coincidence with either beta detector. The gamma-ray energies identify the radionuclide while the beta detectors identify the relative position of the radioactivity in the specimen being analyzed. The background and efficiency of the system and its application to the identification of radionuclides in environmental, niological and extraterrestrial materials are discussed.
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