Abstract
A polycrystalline sodium iodide detector (LSC Gamma Vial) has been developed which allows high efficiency counting of gamma emitting radioisotopes in liquid scintillation counters. The adaptor will fit any standard liquid scintillation counter. The LSC Gamma Vials allow I-125 and Co-57 to be detected in a standard liquid scintillation counter with counting efficiencies of 74% and 54% respectively, as compared to that of conventional gamma counting equipment. Even higher comparative efficiencies (> 100%) were obtained when the standard LSC coincidence circuitry was negated. This detector offers counting efficiency that is relatively independent of volume, has good count rate linearity, and exhibits low background count rates.
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