title: Low level gamma spectrometry by beta-gamma coincidence
abstract: A beta-gamma coincidence system consisting of a 2pi plastic beta detector and a Ge(Li) detector, is described. Such a system allows for a drastic reduction of background (approximately 70 times) as well as of Minimum Detectable Activity (approximately 7 times). An integral background (50-1500 keV) of less than 0.1 cps is obtained. The difficulty of the method, otherwise simple and inexpensive, is the precise determination of beta detector efficiency.
authors.affiliation: National Institute of R&D for Physics and Nuclear Engineering-Horia Hulubei (IFIN-HH), Bucharest, Romania. aurelian_luca@yahoo.com
authors.initials: A
authors.lastname: Luca
authors.lastname: De Felice P
authors.initials: G
authors.lastname: Tanase