Estimation of the neutron chain-length distribution in subcritical systems using a point Monte Carlo code

A point Monte Carlo code has been developed that simulates the evolution of prompt ®s- sion chains in subcritical systems. From this simulation, a numerical estimate of the neutron chain-length distribution as a function of keff has been obtained for subcritical systems. We also discuss the importance of the detector eciency in performing a successful neutron noise measurement in highly subcritical systems