A 4pi(LS)beta-gamma coincidence system using a TDCR apparatus in the beta-channel

This article is an overview of the capabilities of a 4 pi(LS)beta-gamma coincidence counting system based on a liquid scintillation detector in the beta-channel. Equipped with a three-photomultiplier apparatus designed for the triple to double coincidence ratio (TDCR) method, the 4 pi(LS)beta-gamma coincidence system developed at LNHB combines the two techniques. The 4 pi(LS)beta-gamma counting setup records the different types of scintillation events between photomultipliers (double and triple coincidences) and the associated gamma-spectra according to a bi-dimensional configuration. When measuring the activity of a (54)Mn solution, the extrapolation method is carried out by defocusing the photomultipliers; this procedure allows the measurement of gamma-ray sensitivity of the scintillation cocktail in the 835 keV energy region. In addition, in the framework of a (65)Zn standardization, 4 pi(LS)beta-gamma measurements are compared with standard 4 pi(PC)beta-gamma anticoincidence counting using a proportional counter in the beta-channel.