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We constructed a device that measures two γ‐rays and one neutron from spontaneous fission and any resulting multiplication chains. It extends the associated particle technique based upon correlated counting of the multiplicity of gamma‐rays and neutrons released in spontaneous‐ or neutron‐induced fission. There are two advantages in incorporating a third detector in the design over the standard two‐detector version. First, we found that random uncorrelated events dominate the background of coincident counting with a gamma‐ray and neutron detector. These might be suppressed by requiring an additional coincidence. Second, the time history of gamma‐ray emission between the two gamma‐ray detectors is related to multiplication in the target media. Multiplication in highly enriched uranium is much greater than in depleted uranium.

Application of Triple Coincidence for the Detection of Small Amounts of Special Nuclear Materials