Intense thermal neutron fields from a medical-type LINAC : the e_LIBANS project
Lundi 11 décembre 2017 11:00
- Duree : 1 heure
Lieu : Seminar Room 7/8 - ILL 1, 71 avenue des Martyrs, Grenoble
Orateur : Valeria MONTI (INFN Torino, Italy)
The E_LIBANS project (INFN, CSN 5) aims, in its first stage, at producing thermal neutron fields for diverse interdisciplinary irradiation purposes. The primary source is a reconditioned medical LINAC Elekta SL18, recently commissioned in a dedicated bunker at Physics Department and INFN in Torino.
The LINAC has been configured to deliver gamma or electron beams with or without flattening filters. Different primary electron beam energies can be chosen up to 18 MeV . The Linac head is coupled with a photoconverter - moderator apparatus, developed within the e_LiBANS collaboration, equipped with a 30x30xL cm3 irradiation cavity. The depth L can be modulated between 10 cm and 40 cm. Taking advantage of extensive Monte Carlo simulations, the photoconverter and moderator design has been optimized to achieve a pure thermal spectrum, very few gammas and nearly constant homogeneity profile in the irradiation cavity.
Measurements have been carried out to characterized the source. Specially designed thermal neutron detectors with high neutron-to-photon discrimination capability were used inside the irradiation cavity both in air and inside a Bonner sphere system for the spectrum determination. This communication describes the first results of the measurements and offers an overview of the E_LIBANS project.
Contact : tellier@ill.fr
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