engleski

Response of newly developed lithium borate single crystals to 14.5 MeV neutrons

The aim of this study was to compare the TL properties (sensitivities, structure of the glow curves etc.) of newly developed Li2B4O7, Li2B4O7:Cu single crystals to the well known Al2O3:C single crystal dosimeters using gamma and fast neutron (14.5 MeV) irradiation in mGy dose range. The transparent and colourless slits (6mm x 6 mm x 1 mm) of undoped and doped, lithium tetraborate single crystals were prepared for photoluminescent purposes by Czochralski method in Ukraine.( Institute of Electron Physics, Uzhgorod). The following irradiations of TLDs were performed: a) gamma with 137Cs source in Secondary Standard Dosimetry Laboratory, b) 14.5 MeV fast neutrons. Fast neutrons were produced by Texas Nuclear Corporation 300 keV electrostatic accelerator (neutron generator) at Ruđer Bošković Institute using T(d, n)α nuclear reaction. The gamma component was measured by GM counter in the fast neutron irradiation field. The results will be analysed from the aspect of the possibility of discrimination of different components with TLDs in the mixed fast neutron irradiation field. Since in the field used here practically there are no thermal neutrons, the results from this work give valuable data for using these detectors in mixed field.

Lithium borate; TLD; neutrons

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