The EURopean Illicit TRAfficing Countermeasures Kit project is part of the 6th European Union Framework Program,
and aims at developing a neutron inspection system for detecting threat materials (explosives, drugs, etc.) in cargo
containers. Neutron interaction in the container produces specific gamma-rays used to determine the chemical
composition of the inspected material. An associated particle sealed tube neutron generator is developed to allow precise
location of the interaction point by direction and time-of-flight measurements of the neutrons tagged by alpha-particles.
The EURITRACK project consists in developing: a transportable deuterium-tritium neutron generator including a
position sensitive alpha detector (8×8 matrix of YAP:Ce crystals coupled to a multi-anode photomultiplier), fast neutron
and gamma-ray detectors, front-end electronics to perform coincidence and spectroscopic measurements, and an
integrated software which manages neutron generator and detectors positioning, data acquisition and analysis. Hardware
components have been developed and tested by the consortium partners. Current status of this work and provisional
performances of the system assessed by Monte Carlo calculations are presented.
The limitations of energy resolution of scintillation detectors are discussed with a special emphasis on non-proportionality response of scintillators to gamma rays and electrons, which is of crucial importance to an intrinsic energy resolution of the crystals. Examples of the study carried out with different crystals and particularly those of tests of undoped NaI and CsI at liquid nitrogen temperature with the light readout by avalanche photodiodes are presented suggesting strongly that the non-proportionality of the crystals are not only their intrinsic property and may be improved due to selective co-doping.