“…The application of passive and active neutron measurements on low density waste drums (less than 0.4) is continuously being studied at the Nuclear Measurement Laboratory of CEA Cadarache (France) [5,6,[8][9][10][11][12]. As an example, the waste package dealt with in this paper is a high density drum ($2.35), which consists of about 15% (in weight) of materials contaminated by radioactive or nuclear matter (such as gloves, overshoes, laboratory tools, machines, etc.…”