High Order Statistical Signatures From Source-Driven Measurements of Subcritical Fissile Systems

Nuclear Materials Identification System Operational Manual

“…Conditions such as ringing in the source or detector PMT bases may force the use of pulse widths larger than 20 ns. 10 Pulse widths wider than 20 ns may indicate a malfunction of the PMT bases or detector signal cables.…”

Oak Ridge Multiple Attribute System (ORMAS) for Pu, HEU, HE, Chemical Agents, and Drugs

“…Third and limited fourth correlation functions have been implemented in this processor and provide additional signatures which have higher sensitivity to fissile mass 14,15 . Third order correlation functions require three correlated events in different detectors from fission or fission chains to make a contribution to the correlation function and thus require three detection channels.…”

Nwis Measurements for Uranium Metal Annular Castings

“…13 The theoretical analysis has confhned the higher sensitivity to mass and measurements should be performed with these castings using these higher order statistics with their enhanced sensitivity to fissile mass. These higher order correlation measurements with their increased sensitivity to fissile mass should be more useful for quantification of the mass of fissile materials.…”