A system for the measurement of delayed neutrons and gammas from special nuclear materials

摘要

The delayed neutron counting system at the Royal Military College of Canada has been upgraded to accommodate concurrent delayed neutron and gamma measurements. This delayed neutron and gamma counting system uses a SLOWPOKE-2 reactor to irradiate fissile materials before their transfer to a counting arrangement consisting of six He-3 and one HPGe detector. The application of this system is demonstrated in an example where delayed neutron and gamma emissions are used in complement to examine U-233 content and determine fissile mass with an average relative error and accuracy of -2.2 and 1.5 %, respectively.