Prompt gamma neutron activation analysis of large heterogeneous samples composed of concrete and polyethylene

The neutron moderating effect of concrete and polyethylene mixtures on the determination of the sample composition was investigated by irradiating 200 L steels drums with 14 MeV neutrons at the MEDINA (Multi Element Determination based on Instrumental Neutron Activation) facility. The elemental composition was evaluated using a quantification model validated for a concrete matrix in a previous work. The results obtained were found to agree with the expected values within ±34 % which is reasonable with regards to the samples heterogeneity