Neutron coincidence counter for the verification of PuO2 cans

A neutron coincidence counter intended for the verification of cans of PuO2 powder has been designed and optimised using the Monte Carlo radiation transport simulation code–pulse train analyser (MCNP–PTA) which simulates both the neutron transport and the coincidence electronics setup. Severe operational and physical constraints had to be taken into account in designing and optimising the counter as well as in adopting the most adequate strategy for its calibration, validation and application.