Gamma-irradiation applied to the synthesis of the nanocrystalline Gd2O2S:Pr powders for imaging applications. (October 2021)

• Record Type: Journal Article
• Authors: Rostami, B.; Abdi, M.R.; Rezaee Ebrahim Saraee, Kh.; Gharipour, M.M.
• Is Part Of: Applied radiation and isotopes. Volume 176(2021)
• Publication Date: 2021-10
• Subjects: Gd2O2S:Pr -- Luminescence -- X-ray imaging; Radiology -- Periodicals; Radiation -- Industrial applications -- Periodicals; Nuclear chemistry -- Periodicals; Internet resource; Periodical; 660.298
• DOI: 10.1016/j.apradiso.2021.109869
• Languages: English
• ISSNs: 0969-8043

Abstract

Abstract: Nanocrystalline Gd2 O2 S:Pr powders were successfully synthesized by the co-participation method. The changes of size, shape and luminescence properties of these nanocrystalline powders were studied under different gamma doses (0–50 kGy) during the synthesizing process. Also, the structural, morphology and luminescence properties of these nanocrystalline powders were characterized using the X-ray diffraction, field emission scanning electron microscopy, energy dispersion of X-ray spectroscopy, photoluminescence, and thermoluminescence. The XRD results confirmed that the nanocrystalline Gd2 O2 S:Pr powders have a pure hexagonal structure with the high crystallinity at a temperature of 900 °C, and the gamma radiation doses have no effect on the structure. The SEM images showed that the nanocrystalline Gd2 O2 S:Pr powders have a spherical shape and are agglomerated when the irradiation dose increases. These nanopowders, which were prepared at an irradiation dose of 40 kGy, show the lowest crystallite size and hence the highest intensity of emission peaks at the wavelengths of 506, 515 and 671 nm, which are corresponded to the transitions of the 3 P1 – 3 H4, 3 P0 – 3 H4 and 3 P0 – 3 F2 of Pr ions, respectively. The X-ray radiography image was obtained by the screen of Gd2 O2 S:Pr nanopowders (prepared at 40 kGy gamma dose), coupled with a radiographic film. The TL glow curves of the sample, prepared at 40 kGy gamma dose, were recorded under the X-ray irradiation in the times of 5 and 10 min. The heating rate and preheat temperature were obtained 2 and 50 °C, respectively. The obtained results were investigated in details. Highlights: Gamma dose during the synthesizing process was changed. Different dose effects on the luminescence properties of Gd2 O2 S:Pr was studied. Structural properties of the nanophosphors of Gd2 O2 S:Pr investigated. X-ray radiography images were obtained from screens fabricated from nanopowders. CGCD method was used to analysis of the peak temperature values on the glow curves.