A 4π(LS)β–γ coincidence system using a TDCR apparatus in the β-channel

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