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Registration Number

0225U002695, (0122U001833) , R & D reports

Title

Optically stimulated luminescence in new dosimetric materials based on doped borate glass and glassnanoceramic

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Порівняльний аналіз та інтерпретація результатів проведених на попередніх етапах досліджень. Вибір варіантів основних і домішкових складів зразків легованого боратного скла і склонанокераміки, перспективних для ОСЛ дозиметрії. Встановлення дозових залежностей ОСЛ у вибраних зразках для X-, γ- і β- радіації.

Head

Padliak Bohdan V., д.ф.-м.н.

Registration Date

29-03-2025

Organization

Ivan Franko National University of Lviv

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The aim of the project is to obtain and to carry out the structural and spectroscopic studies of vitreous borate compounds and their corresponding glassnanoceramic with different basic chemical composition, doped with RE and transition elements and to achieve effective OSL for use in ionizing X-ray (X), gamma (γ) and betta (β) radiation dosimeters. Based on the results of these studies, the main compositions of borate glass and glassnanoceramic and the types and content of doping impurities in them will be selected as new promising materials for OSL dosimeters, including medical 2D and 3D dosimeters for radiotherapy and neutron dosimeters.

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 Improved technology of tetraborate glass with Li2B4O7 composition co-doped with rare earth (Pr, Eu, Sm, Dy) and transition (Ag, Cu, Mn) elements and triborate glass LiB3O5, doped with Ag (LiB3O5:Ag) and corresponding glass nanoceramics (pyroceramics) as promising materials for OSL dosimetry. Local structure, spectroscopic and luminescent properties of the obtained Li2B4O7:Pr, Li2B4O7:Pr,Ag, Li2B4O7:Cu,Eu, Li2B4O7:Cu,Sm, Li2B4O7:Mn,Eu, Li2B4O7:Mn,Sm, and Li2B4O7:Dy,Ag glasses, containing 1.0 mol.% CuO, MnO2, Pr2O3, Eu2O3, Sm2O3, Dy2O3 and 2.0 мол.% AgNO3, were studied by X-ray diffraction, electron paramagnetic resonance, and optical spectroscopy (absorption, excitation, emission and luminescence decay kinetics). Parameters of the local structure in Li2B4O7 and LiB3O5 glasses were determined, electronic structure of impurity rare earths and transition ions in them was established, and their optical-luminescent properties were analyzed. The enhancement of Pr3+ and Dy3+ luminescence in Li2B4O7:Pr,Ag and Li2B4O7:Dy,Ag glasses was revealed, which is due to energy transfer from Ag+ ions and Ag aggregates to the Pr3+ and Dy3+ ions as well as local field effect, caused by surface plasmon resonance (SPR) of metallic Ag nanoparticles. The processes, mechanisms and schemes of the excitation energy transfer between transition and rare earth ions are considered and their influence on intensity and quantum yield of luminescence in all studied Li2B4O7 glasses, co-doped with rare earth and transition elements is established. Optical absorption, excitation and emission spectra of photoluminescence and OSL of -irradiated LiB3O5:Ag glass with Ag content of 0.0, 0.1, 0.5, 1.0 and 1.5 wt.% were studied. It was found that LiB3O5:Ag glass, which has an effective atomic number Zeff = 7.39 close to Zeff = 7.42 of human body tissue, is promising for OSL dosimetry in radiation therapy of cancer patients. The OSL of -irradiated Li2B4O7:Cu,Eu glass was studied and analyzed for the first time

Product Description

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Adamiv Volodymyr T.
Padliak Bohdan V.
Sai Andrii S.
Tesliuk Ihor M.
Shpotiuk Liubov Y.

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2025-03-29