MODES SNM is a collaborative project (funded under the FP7 - Security program), aimed at developing a
prototype for a mobile, modular detection system for radioactive and Special Nuclear Materials (SNM). To
maximize the detection capability for SNM, the prototype will combine detectors for fast and thermal neutrons, as well as for gamma-rays. The key detector technology in the development is high pressure scintillation cells filled with noble gases, as recently developed by ARKTIS. The project started officially at the beginning of 2012, for a duration of 30 months. The goal of the project is to deliver a fully integrated and field tested prototype of a modular mobile system capable of passively detecting weak or shielded radioactive sources with accuracy higher than currently available systems. We will present the status of the project, preliminary results and future prospects.
A neutron spectroscopic technique for plutonium content measurement is described. The technique exploits the
kinematic cuto of neutron emission from (α, n) reactions on oxygen. The Watt spectrum of ssion neutron
emission extends to higher energies without such a cuto. 4He scintillation detectors were calibrated with an
energy cut to reject neutrons of low energies, thereby making the detectors sensitive only to ssion neutrons
but not to neutrons from the (α, n) reaction on oxygen. Experimental results are presented. Simulations are
discussed to evaluate possible self shielding eects. Furthermore, numerous factors in
uencing gamma rejection
are discussed.
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