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Conception, réalisation et caractérisation d'un dispositif de détection neutronique basé sur l'utilisation de scintillateurs plastiques dopés au Bore

Abstract : This work focuses on the study, the characterization and the fabrication of Boron-loaded plastic scintillators. Their use in thermal and fast neutron detection devices is also investigated.
Fabrication process, especially boron doping, is explained in the first part of this work. Several FTIR, UV-visible and NMR analysis methods were used in order to characterize the material and to check its structure and stoechiometry. Experiences were done using alpha particles and proton beams to measure the scintillation characteristics. Light emission could therefore be completely determined by the Birks semi-empirical relation.
In the second part, the whole detector simulation is undergone : interaction between material and radiation, light generation, paths and signal generation. Neutron simulation by MCNP (Monte Carlo N-Particles) is coupled to a light generation and propagation code developed especially during this work. These simulation tools allow us to optimize the detector geometry for neutron detection and to determine the geometry influence to the photon collection efficiency. Neutron detection efficiency and mean lifetime in this scintillator are also simulated. The close fit obtained between experimental measurements and simulations demonstrate the reliability of the method used.
The third part deals with the discrimination methods between neutron and gamma, such as analog (zero crossing) and digital (charge comparison) ones. Their performances were explained and compared.
The last part of this work reports on few applications where neutron detection is essential and can be improved with the use of boron loaded plastic scintillators. In particular, the cases of doped scintillation fibers, neutron spectrometry devices and more over neutron multiplicity counting devices are presented.
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https://tel.archives-ouvertes.fr/tel-00396150
Contributor : Stéphane Normand <>
Submitted on : Wednesday, June 17, 2009 - 9:14:40 AM
Last modification on : Monday, February 10, 2020 - 6:12:33 PM
Long-term archiving on: : Thursday, June 10, 2010 - 8:32:01 PM

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  • HAL Id : tel-00396150, version 1

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Stéphane Normand. Conception, réalisation et caractérisation d'un dispositif de détection neutronique basé sur l'utilisation de scintillateurs plastiques dopés au Bore. Physique Nucléaire Théorique [nucl-th]. Université de Caen, 2001. Français. ⟨tel-00396150⟩

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