Destruction of Doped Lithium Tetraborate under Exposure to Ionizing and Laser Radiation

Resumo

The results of the study of the degradation of thermoluminescent materials Li₂B₄O₇:Be + Mn and Li₂B₄O₇:Zn + Mn under the effect of radiation (pulsed electron beam) and laser radiation are presented. As a result of exposure to high doses of radiation, the structure of the samples under study partially acquires an amorphous character, while the effect of radiation exposure is manifested in the optical properties in the appearance of green luminescence due to manganese centers in the tetrahedral environment. With subsequent irradiation with a laser at a wavelength of 350 nm, luminescence centers decay due to photochemical oxidation of manganese by the reaction of Mn²⁺ → Mn³⁺. It is shown that Li₂B₄O₇:Be + Mn has a lower radiation resistance than Li₂B₄O₇:Zn + Mn.