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Survey Result of the Counting Efficiency of Gamma Counter by Certified Reference MaterialsDOI: 10.1007/s13139-018-0515-z Keywords: Radioimmunoassay, Immunoradiometric assay, Efficiency, Quality control Abstract: The counting efficiency of 44 gamma counters from 23 institutions. The counting efficiency of 44 gamma counters from 23 institutions was demonstrated as graph. The mean (circle) and range (bar) of percent counting efficiency were shown for each gamma camera from each institutio
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