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Appl Radiat Isot. 2004 Aug-Sep;61(2-3):191-5.

Low-level gamma spectrometry using beta coincidence and Compton suppression.

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1
National Institute of R&D for Physics and Nuclear Engineering, Horia Hulubei, IFIN-HH, PO Box MG-6, Bucharest, -Magurele 76900, Romania. elgrigorescu@yahoo.com

Abstract

A low-level gamma-ray spectrometry system was developed using a Ge(Li) detector with 6% relative efficiency coupled to a 2pi beta plastic detector for coincidence selection and a massive NaI(Tl) detector for Compton suppression. The integral background count rate for (50-1500)keV was 0.5 s(-1)kg(-1) (Ge), using only beta coincidences. With Compton suppression, a value of 0.25 s(-1)kg(-1) (Ge) was obtained. Spectra with and without Compton suppression were studied for 60Co, 137Cs and 152Eu point sources. Considerations are made concerning the Compton suppression advantages in different situations.

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