Evaluation of a ZnS:6LiF based scintillation neutron detector at high counting rates

Abstract

In this work we revisit the problem of the restricted count rate capability of thermal neutron detectors utilizing the ZnS scintillator . The effect of the long afterglow of the scintillator on the detector performance at high counting rates is studied. A count rate capability substantially above values currently regarded as feasible is demonstrated. • Afterglow of ZnS: 6 LiF so far regarded as limiting the count rate capability. • Concept of individual sensitive elements and signal processing introduced. • This concept overcomes the assumed limitation on count rate capability. • Count rates up to 80 kHz per readout channel reached at event losses below 10% • Count rate capability depends not only on dead time but also on trigger efficiency.