PACS: 87.74.- t, 78.60.Ya

Application of scintillators based on single-crystalline Lu₃Al₅O₁₂:Ce₃+ films for radiation monitoring in biology and medicine

¹Yu. Zorenko, ¹V. Gorbenko, ¹I. Konstankevych, ²B. Grinev, ²M. Globus, ³M. Batentschuk

1-Institute of Applied Physics Lviv State University, Lviv, 49 Gen. Chuprynka Str., Ukraine
tel/fax +380 (322) 353475, E-mail: zorenko@iap.franko.lviv.ua ;
2-Institute for Single Crytals of National Academy of Science, Kharkiv, Ukraine;
3-Institute for Material Science 6, Electronic Materials, University of Erlangen, Erlangen, Germany

Semiconductor Physics, Quantum Electronics & Optoelectronics. 2000. V. 3, N 2. P. 213-218.

Abstract. Possibility of producing screens of X-ray detectors using liquid phase epitaxy on Y₃Al₅O₁₂ substrates covered by Lu₃Al₅O₁₂:Ce single crystalline films (SCF) is studied. Optical, luminescent and luminous characteristics of these SCF doped with isoelectronic La, Y, Sc impurities are analyzed. The possibility of crystallization of Lu₃Al₅O₁₂: Ce SCF on Y₃Al₅O₁₂ substrates by means of matching the lattice parameters of these garnets, when Lu³⁺ ions in Al³⁺ octa-sites, is proved. With the aim of matching the emission spectra of SCF based on Lu₃Al₅O₁₂: Ce, with the spectral sensitivity range of radiation detectors – CCD cameras – we investigated SCF containing Gd³⁺, Tb³⁺, and Eu³⁺ impurities. The maximum light yield, exceeding that of analogs based on Y₃AL₅O₁₂:Ce SCF by the factor of 1.1-1.5, is shown to be intrinsic for Lu₃Al₅O₁₂:Ce³⁺, Lu₃Al₅O₁₂:Ce, Y, La and Lu₃Al₅O₁₂:Ce, Tb SCF. An increase of the effective atomic number Zeff and density r up to the values of 60.6 and 7.35 g/cm³ respectively, enables the efficiency of X-ray absorption in comparison with Y₃Al₅O₁₂:Ce³⁺ SCF by the factor of 2.5–8 higher and to reach spatial resolution not less than 0.75–1.0 mm at the SCF thickness of 1.0–2.0 mm.

Keywords: x-ray detector, single-crystalline film, spatial resolution, light yield, liquid phase epitaxy, impurities, garnets, Ce-dopant.

Paper received 29.09.99; revised manuscript received 27.11.99; accepted for publication 21.03.00.

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