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10LS-P-9
Influence of ionizing irradiations on the optical characteristics of the Gadolinium-Aluminum-Gallium-garnet single crystals
N. Kozlova1, O. Buzanov2, E. Zabelina1, P. Lagov13, V. Kasimova, Y. Pavlov3, V.
Stolbunov4
'National University of Science and Technology MISiS, Moscow, Russia 2JSC "Fomos-Materials" Co., Moscow, Russia 3A.N. Frumkin Institute of Physical Chemistry and Electrochemistry Russian Academy of Sciences (IPCE
RAS), Moscow, Russia 4Institute of Theoretical and Experimental Physics (ITEP), Moscow, Russia
E-mail: [email protected]
Modern requirements for the devices used in fields of high-energy radiation technologies (nuclear medicine, atomic physics, and space research) determine new the requirements for the sensors and detectors and their working elements. Thus, the devices of nuclear and space technology operate in harsh conditions under intense electromagnetic radiation.The working element of the high-energy radiation detector is scintillation material. One of the promising and studied scintillation materials is garnets due to the wide possibilities of isomorphic substitution of cations and the introduction of alloying additives. It is this feature of garnets doped with rare-earth elements that allows us to control the properties and determine new areas of their application in the future [1-3].
New cerium-doped scintillation garnets Gd3AhGa3O^:Ce (GAGG:Ce) first synthesized in 2011 [4] are currently considered for applications in the various fields: nuclear medicine, high energy physics, space research, security systems, radiological exploration, lighting. However, their fundamental properties are not sufficiently studied; in particular, the process of defect formation in these crystals remains unclear. Getting insight to the defects structure and its formation in multicomponent oxide single-crystal dielectric materials is nontrivial task. The study of the irradiation effects on ion structures is a productive method for investigation of the origin of the defect structure and mechanisms of its formation.
Here, we present first results of our studies of GGAG group crystals optical properties under electron and proton irradiations carried out in order to clarify the origin of the defect formation.
All investigated samples were cut from crystals grown in JSC "Fomos-Materials" Co. using Czochralski method in iridium crucibles.
Electron irradiation was performed at the Center of Physical Measurements Investigations of IPCE RAS using the linear accelerator (energy 6 MeV, dozes up to 2500 MRad).
Proton irradiation was performed on linear accelerator I-2 at the Center of Collective Use "Kamiks" of ITEP (energy 20 MeV, dozes up to 630 MRad).
The optical properties of the crystals were measured in the certified Cary-5000 spectrophotometer "Agilent Technologies" with an automatic universal measuring accessory UMA in the accredited testing laboratory "Single Crystals and Stock on their base" of NUST MISIS. The spectral dependences of the transmission coefficients T(A) at the normal incidence of light of natural polarization and the reflection coefficients R(l) are measured at different angles of incidence of p-polarized light.
[1] P. Lecoq Development of new scintillators for medical applications, Nuclear Inst. and Methods in Physics Research A, 2016, V. 809, pp. 130-139.
[2] P. Dorenbos Electronic structure and optical properties of the lanthanide activated RE3(Ah- xGax)5O12 (RE= Gd, Y, Lu) garnet compounds, Journal of Luminescence, 2013, V. 134, pp 310-318.
[3] K. Kamada, T. Yanagida, J. Pejchal, M. Nikl, T. Endo, K.Tsutumi, Y. Fujimoto, A. Fukabori, A. Yoshikawa Scintillator-oriented combinatorial search in Ce-doped (Y, Gd)3(Ga, Al)5O12 multicomponent garnet compounds, Journal of Physics D: Applied Physics, 2011, V. 44, №. 50, pp. 505104.
[4] Kamada K., Yanagida T., Endo T., Tsutumi K., Usuki Y., Nikl M., Fujimoto Yu., Yoshikawa A. // IEEE NSS/MIC, 2011., pp. 1927-1929.
