Optical and scintillation properties of 50AEO-50SiO2-1SnO (AE = Mg, Ca, Sr, Ba) glasses were investigated. In photoluminescence (PL) and scintillation, the glasses showed a luminescence peak around ...400 nm which was attributed to the T1-S0transitions of Sn2+. The afterglow levels of theAE = Mg and Ba glasses were better than that of a commercial Tl-doped CsI scintillator. The light yields of the glasses were quantitatively acquired and theAE = Ba glass showed the highest light yield of 63 ph/5.5 MeV-α of among the glasses.
Dosimetric properties of Tb-doped CaGdAlO4 single crystals Aoki, Zuiko; Takebuchi, Yuma; Nakauchi, Daisuke ...
Nuclear instruments & methods in physics research. Section B, Beam interactions with materials and atoms,
February 2024, 2024-02-00, Letnik:
547
Journal Article
Recenzirano
Tb-doped CaGdAlO4 crystals were investigated and showed photoluminescence peaks due to Tb3+. Likewise, multiple emission peaks derived from Tb3+ were detected in the optically stimulated ...luminescence. According to the thermally stimulated luminescence dose response, the detection limit was 1 µGy which was superior to several commercial dosimeters.
Tb-doped SiO2 glasses were synthesized by the spark plasma sintering (SPS) method, and optical and thermally stimulated luminescence (TSL) properties were investigated. The diffuse transmittance ...spectra of the 0.01, 0.05, and 0.1% Tb-doped SiO2 samples included the absorption due to the 4f-5d transitions of Tb3+ ions. In photoluminescence properties, all the Tb-doped SiO2 samples showed several emission peaks due to the 4f-4f transitions of Tb3+ ions and oxygen deficiency vacancy (ODC). The TSL glow curves indicated the glow peak at 140 °C, and only the emission peaks attributed to the 4f-4f transition of Tb3+ ions were observed in TSL spectra of the 0.01, 0.05, and 0.1% Tb-doped SiO2 samples. The integrated TSL intensity of the 0.1% Tb-doped samples had a proportional relationship in the range of 0.01–1000 mGy. The TSL intensity of the 0.05% Tb-doped glass after 72 h from X-ray irradiation was about 69% with respect to the one immediately after X-ray irradiation. In addition, the 0.05% Tb-doped SiO2 glass could use the multiple time for TSL dosimetry.
•We have synthesized Tb-doped SiO2 glasses by spark plasma sintering method.•We have characterized the photoluminescence and dosimetric properties.•Tb-doped SiO2 samples showed luminescence properties due to the 4f-4f transitions of Tb3+.•0.1% Tb-doped sample showed the highest TSL intensity among the samples.
0.01, 0.1, 0.5, and 1% In-doped CsBr transparent ceramics were synthesized by the spark plasma sintering method. Their photoluminescence and optically stimulated luminescence (OSL) properties were ...evaluated. All the samples showed transparency with transmittances of 40–60%. Luminescence due to 3P1–1S0 transitions of In + appeared at 500 nm. OSL emission peaks were confirmed at 500 nm upon constant stimulation light at 630 nm. A 0.1% In-doped sample showed the highest OSL intensities in prepared samples and the dose-response relationship was linear from 0.01 to 1000 mGy. The spatial resolution of X-ray images was confirmed from 5.00 LP/mm by using OSL of a 0.1% In-doped sample.
•In-doped CsBr transparent ceramics were fabricated via the spark plasma sintering method.•OSL emission spectra were observed at 500 nm upon constant optical stimulation at 630 nm.•0.1, 0.5, and 1% In-doped CsBr transparent ceramics showed the detection limit at 0.01 mGy in OSL dose-relationships.•When the performance as an IP of a 0.1% In-doped CsBr was evaluated, the spatial resolution was confirmed from 5.00 LP/mm.
Photoluminescence (PL) and scintillation properties of undoped and Ti-doped LiGaO2 single crystals were investigated. In both PL and scintillation, the Ti-doped LiGaO2 crystals showed luminescence ...due to charge transfer between Ti4+–O2- while the undoped LiGaO2 crystal showed luminescence due to oxygen vacancies. Under thermal neutron irradiation, all the LiGaO2 crystals exhibited a clear thermal neutron peak, and the highest light yield was observed from the 3% Ti-doped LiGaO2 crystal. The light yield of the 3% Ti-doped LiGaO2 crystal was ten times higher than that of the undoped LiGaO2 crystal and comparable with that of a commercial neutron scintillator GS20. In addition, the Ti-doped LiGaO2 crystals showed high α/γ ratios up to about 0.7.
•Ti-doped LiGaO2 single crystals were synthesized by the floating zone method.•The light yield of the 3% Ti-doped LiGaO2 single crystal was 6700 ph/n.•The Ti-doped LiGaO2 showed high α/γ ratios up to about 0.7.
We synthesized the Ti-doped MgGa2O4 single crystals as a novel radiation detection material. XRD patterns indicated the synthesized crystals were single phase of MgGa2O4. Diffuse transmission spectra ...revealed that Ti was doped into octahedral Ga3+ site as Ti4+ and tetrahedral Mg2+ site as Ti3+. The 0.1% Ti-doped crystal showed the highest photoluminescence quantum yield among the crystals. The 0.1% Ti-doped crystal also performed the best in view point of scintillation light yield and lowest measurable dose in thermally stimulated luminescence (TSL). The scintillation light yield and lowest measurable dose in TSL of the 0.1% Ti-doped crystal were 5208 ph/5.5 MeV-α and 0.1 mGy, respectively.
We have synthesized Dy-doped LiCaPO4 samples by the conventional solid-state reaction and evaluated photoluminescence (PL), scintillation, and dosimetric properties. The samples showed luminescence ...which was attributed to the 4f-4f transitions of Dy3+ by irradiation of UV and X-ray. The highest PL quantum yield (QY) of 59.2% was obtained from the 0.5% Dy-doped sample. The 0.5% Dy-doped sample exhibit the highest intensity in scintillation and thermally stimulated luminescence (TSL) as well. In TSL dose response function, the 0.5% Dy-doped LiCaPO4 showed the proportional relationship from 0.01 to 30 mGy under X-ray irradiation. The TSL intensity surpassed the commercial product.
Optically-stimulated luminescence (OSL) and thermoluminescence (TL) properties of RbI:Eu single crystals synthesized by the vertical Bridgman-Stockberger method were evaluated. OSL peak at 430 nm due ...to 4f65d1-4f7 transition of Eu2+ was observed under stimulation at 750 nm. The 0.5% Eu-doped sample exhibited the highest OSL intensity among all the sample, and the detection limit was 1 mGy. TL glow peaks at ∼100 and ∼200 °C were observed and were ascribed to Fz-center (F-center near Eu2+-cation vacancy dipole) and F-center, respectively. The 0.5% Eu-doped sample showed the highest TL intensity among all the sample, and the detection limit was 0.01 mGy.
•RbI:Eu single crystals were synthesized by the vertical Bridgman-Stockbarger method.•Photoluminescence, optically-stimulated luminescence (OSL), and thermoluminescence (TL) properties of RbI:Eu were evaluated.•The optimal concentration turned out be 0.5% for the OSL and TL.
