Abstract:
The work of thesis was realized in collaboration with Our laboratory of Crystallography -
University frères Mentouri, Constantine1- Algeria, institut lumière - matière ( ILM ) Lyon1-
france, the European Center for Nuclear Research (CERN) in Geneva-Switzerland, and the
Institute for Scintillation Materials NAS, Kharkov-Ukraine (ISMA), we developed and
characterized crystal fibers doped with cerium and praseodymium by micro-pulling down
technique.
Studies of the scintillation properties of cerium and praseodymium doped garnets, were
performed on crystal fibers elaborated by the micro-pulling down growing technique.
Aluminates of A3Al5O12 (A = Y or Lu) doped with Ce3+ or Pr3+ ions were synthesized as
mono-crystals fibers.
The studies carried out by DRX, absorption and emission spectroscopy demonstrate that the
YAG and LuAG phases are obtained alone without any other parasitic phases. Measurements
of attenuation along the fibers and distribution of the rare earth activator (Ce3+ or Pr3+) gave
spatial mapping of the distribution of dopants in the fibers, which made it possible to evaluate
the luminous in-homogeneities within the fiber Material as a function of the different growing
parameters, which made it possible to evaluate the efficiency of each of the two materials in
detecting the gamma rays.
The whole of this work clearly shows the potential applications of these two materials.
