Developing detectors operating in time coincidence is a possible way to increase the sensitivity in gamma spectroscopy. Such design allows both the selection of specific events and the rejection of background. In this work we present a new low background detector mainly developed for the determination of radioactive contamination of liquid samples. The system was constructed by combining a liquid organic scintillator, for the detection of alpha and beta particles, and a High Purity Germanium for the detection of correlated gamma rays. Despite being located in a non-underground laboratory, the instrument can reach sensitivities in the range of tens mBq/kg for 238U, 235U and 232Th, exploiting alpha–gamma and beta–gamma coincidence events.
Baccolo, G., Barresi, A., Beretta, M., Chiesa, D., Nastasi, M., Previtali, E., et al. (2021). Development of a low background alpha–beta/gamma coincidence detector. NUCLEAR INSTRUMENTS & METHODS IN PHYSICS RESEARCH. SECTION A, ACCELERATORS, SPECTROMETERS, DETECTORS AND ASSOCIATED EQUIPMENT, 1003(1 July 2021) [10.1016/j.nima.2021.165290].
Development of a low background alpha–beta/gamma coincidence detector
Baccolo G.;Barresi A.
;Beretta M.;Chiesa D.;Nastasi M.;Previtali E.;Sisti M.
2021
Abstract
Developing detectors operating in time coincidence is a possible way to increase the sensitivity in gamma spectroscopy. Such design allows both the selection of specific events and the rejection of background. In this work we present a new low background detector mainly developed for the determination of radioactive contamination of liquid samples. The system was constructed by combining a liquid organic scintillator, for the detection of alpha and beta particles, and a High Purity Germanium for the detection of correlated gamma rays. Despite being located in a non-underground laboratory, the instrument can reach sensitivities in the range of tens mBq/kg for 238U, 235U and 232Th, exploiting alpha–gamma and beta–gamma coincidence events.
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