Trevisan, Stefano (2016) Valutazione dei livelli di radiazione nella sala sperimentale del progetto ANEM a SPES. [Laurea triennale]
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ANEM is an irradiation line with fast neutrons whose design is under development within the SPES project at the INFN National Laboratory of Legnaro (Italy). Atmospheric neutrons are a threat for modern electronic devices produced in very scaled technologies because their capability to induce Single Event Effects. Validation against such effects is required for devices designed for sensitive applications (biomedical, automotive, avionics, etc.). ANEM will produce neutron fluxes with atmospheric spectrum intense enough to measure in a reasonable amount of time the small cross sections of the Single Event Effects These intense neutron fluxes will produce strong radiation fields within the neutron production target and irradiation halls that can activate the air inside the halls and escape through the walls. In addition albedo neutron can vary in a sensitive way the neutron energy spectrum in the irradiation hall. This thesis presents a preliminary evaluation of both such effects. The present design of the shielding is not fully adequate to contain the radiation fields and must be improved. The albedo neutrons strongly contaminate at low energy the spectrum of the neutrons produced by the ANEM target: their contribution has to be controlled by inserting dedicated absorbers.
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