Time-dependent neutron field experimental set-up at the pulsed neutron generator in the Institute of Nuclear Physics

The pulsed neutron generator in the Institute of Nuclear Physics in Krakow operates as a pulsed and/or stationary neutron source. Its experimental set -up for research of the time-dependent thermal neutron fields in various me dia is presented. The electronic control systems for the generator and for data acquisition, necessary to assure the required measurement conditions, have been designed and built by the authors. The new electronic equipment m akes it possible to do the measurements with high accuracy and repeatabilit y. The macroscopic absorption cross section for environmental materials, li ke rocks, borehole and formation fluids, are measured routinely using the p ulsed neutron source by two methods elaborated in the INP. The pulsed neutr on parameters for homogeneous and heterogeneous materials (e.g. containing absorbing centres in a low absorption matrix) can be also measured by the g eometrical buckling method on the same experimental set-up. Experiments for materials of variable bulk densities are going on. Other experiments are r elated to a verification of new theoretical models of thermal neutron scatt ering in hydrogenous media.