Wydział Chemii

C. Michail

I. Valais

Ioannis Seferis

N. Kalyvas

S. David

G. Fountos

I. Kandarakis

2014

Radiation Measurements

70

59-64

10.1016/j.radmeas.2014.09.008

Naukowa

Angielski

Artykuł

The aim of the present study was to investigate the absolute luminescence efficiency of gadolinium oxysulfide powder scintillators, doped with praseodymium, cerium and fluorine (Gd₂O₂S:Pr,Ce,F). Gd₂O₂S:Pr,Ce,F is a non-hygroscopic material, emitting green light with short decay time. For the purposes of this study, two scintillating screens with coating thicknesses 35.7 and 71.2 mg/cm², were prepared in our laboratory from Gd₂O₂S:Pr,Ce,F 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 efficiency under X-ray exposure conditions with tube voltages ranging from 50 to 130 kV. Results were compared with previously published data for Gd₂O₂S:Eu screens. The spectral compatibility of Gd₂O₂S:Pr,Ce,F with various existing optical detectors, was investigated after emission spectra measurements. Particle size and morphology parameters of the Gd₂O₂S:Pr,Ce,F powder phosphor were verified via scanning electron microscope (SEM) micrographs. Absolute efficiency was found to maximize at 60 kVp for the 71.2 mg/cm² and at 90 kVp for the 35.7 mg/cm² Gd₂O₂S:Pr,Ce,F screens. Absolute efficiency of the 71.2 mg/cm² Gd₂O₂S:Pr,Ce,F screen was higher in the whole X-ray tube voltage range showing potential interest for non-CT medical imaging (i.e. dental radiology) or industrial digital radiography.

Inorganic scintillators, Radiation detectors, Gd2O2S:Pr, Ce, F

http://dx.doi.org/10.1016/j.radmeas.2014.09.008