2002•Unpublished venueOpen access

Comparison Of NaI And HPGe Minimum Detectable Activities

Paul Bailey

Abstract

The Minimum Detectable Activity of a 76 mm by 76 mm (3" by 3") sodium iodide (NaI) crystal and 18 %, 42 % and 68 % efficient HPGe detectors were calculated and compared for gamma-ray spectrometry with count times in the range of 1 second to 15 minutes. All cases were for in situ measurements with a surface distribution source and a detector height of 1 meter. The radionuclides considered were 137Cs and 60Co.

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Key concepts: Sodium iodide, Semiconductor detector, Gamma ray spectrometry, Radionuclide, Radiochemistry, Physics, Gamma spectroscopy, Detector