Measurement of Activated Au foils by 2πβ+2πβ-γ Coincidence Counting and EGS5 Monte Carlo Calculation

Neutron activation analysis using Au foil is a common and important method for measurement of thermal neutron fluence. To determine the activity of Au foil experimentally, Kawada et. al.([1]) proposed 2 pi beta+2 pi beta-gamma coincidence counting. This method is based on 4 pi beta-gamma coincidence counting but a 4 pi beta detector is divided into two 2 pi beta detectors those are independently operated in the method. In this research the correction factors in 2 pi beta+2 pi beta-gamma coincidence counting were obtained by measurement and simulation. The activities obtained by these correction factors were in good agreement.