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2013 (EN)
On the response of GdAlO3 (EN)

Δαυίδ, Στράτος Λ. (EL)
Μιχαήλ, Χρήστος Μ. (EL)
Καλύβας, Νεκτάριος Ι. (EL)
Βαλαής, Ιωάννης Γ. (EL)
Σεφέρης, Ιωάννης Ε. (EL)

Τουτουντζής, Ανδριανός Ε. (EL)
Τ.Ε.Ι. Αθήνας. Σχολή Τεχνολογικών Εφαρμογών. Τμήμα Μηχανικών Βιοϊατρικής Τεχνολογίας Τ.Ε. (EL)
Καραμπότσος, Αθανάσιος Χ. (EL)
Κανδαράκης, Ιωάννης Σ. (EL)
Λιαπαρίνος, Παναγιώτης Φ. (EL)
Φούντος, Γεώργιος Π. (EL)

The aim of the present study was to investigate the luminescence efficiency (XLE) of gadolinium aluminum perovskite (GdAlO3:Ce) powder scintillator. This powder phosphor, also known as GAP:Ce scintillator, is a non-hygroscopic material, emitting blue light with short decay time. For the purposes of this study, five scintillating screens with coating thicknesses, 14.7, 31.0, 53.7, 67.2 and 121.1 mg/cm2, were prepared in our laboratory from GdAlO3:Ce powder (Phosphor Technology, Ltd) by sedimentation on silica substrates. The light emitted by the phosphors under investigation was evaluated by performing measurements of the absolute luminescence efficiency (AE), X-ray luminescence efficiency and detector quantum gain (DQG) under X-ray exposure conditions with tube voltages ranging from 50 to 140 kV. The quantum detection efficiency (QDE) and energy absorption efficiency (EAE) were also evaluated. The spectral compatibility of GdAlO3:Ce, with various existing optical detectors, was investigated after emission spectra measurements. A theoretical model, describing radiation and light transfer, was used to fit experimental AE data. This has allowed the estimation of optical attenuation coefficients of the scintillator. GdAlO3:Ce exhibited higher QDE and EAE values, compared to aluminium perovskite (YAlO3:Ce) but lower absolute efficiency values. Absolute efficiency was found to increase with increasing X-ray tube voltage, although for values higher than 120 kVp a decrease was observed (EN)

journalArticle

Inorganic scintillators (EN)
Ce (EN)
Radiation detectors (EN)
GdAlO3 (EN)
Ανόργανοι σπινθηριστές (EN)
Ανιχνευτές ακτινοβολίας (EN)

ΤΕΙ Αθήνας (EL)
Technological Educational Institute of Athens (EN)

Journal of Luminescence (EN)

English

2013-12

doi:10.1016/j.jlumin.2013.06.041

N/A (EN)



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