Nuclear safeguards is primarily concerned with the detection of significant quantities of specialnuclear material. Spent nuclear fuel offers a diversion pathway of significant quantities. Thegross neutron signal of spent nuclear fuel could be used to detect signal aberrations caused bydiversions, provided the temporal, enrichment, and environmental components of the signal areunderstood and characterized such that these aberrations can be detected and noted. This studycharacterizes the neutron s ...