Effects of source-fissile material distributions on the accuracy of time correlated counting

Time correlated counting has been proposed as a possible criticality monitor at the Transuranic Waste Treatment Facility (TWTF). This paper investigates possible errors which might arise in estimates of k/sub eff/ due to the assumption implicit in time correlated counting, that neutron multiplication is constant from generation to generation. It appears that the assumption of uniform multiplication of neutrons between generations will not generally produce large errors in time correlated counting. However, a point source at the edge of a system could produce large errors.