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Simulation of one-fold (above), two-fold and three-fold coincidences (below) after a 10 min inspection of a container filled with a 0.2 g.cm−3 iron cargo. Neutron generator total emission is 3 × 107 s−1 and a HEU block, bare or in cadmium and lead shielding, is in the center of container. For comparison, simulations without nuclear materials (shield alone or bare iron matrix) are also reported.
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