Photoluminescence and thermally-stimulated luminescence (TSL) characteristics of BaCaBO3F doped with various amounts of Tm were evaluated. The Tm-doped BaCaBO3F showed an emission with a sharp peak ...around 460 nm originating from the 4f-4f transition of Tm3+ in photoluminescence and scintillation. Their photoluminescence and scintillation decay times for the Tm-doped BaCaBO3F were 0.68–0.73 and 1.28–1.55 ms, respectively. Furthermore, the TSL dynamic range of the glow peaks at 190 °C for the 0.5% Tm-doped BaCaBO3F was from 0.1 mGy to 1000 mGy. Furthermore, the TSL isothermal analysis of the Tm-doped BaCaBO3F suggested that at least 12 different activation energies related to TSL were confirmed.
•Tm-doped BaCaBO3F was fabricated by the conventional solid-state reaction.•Tm-doped BaCaBO3F showed efficient TSL with several glow peaks.•Linear TSL dose response was confirmed to be in the dose range from 0.1 to 1000 mGy.
The undoped and Ce-doped MgAl2O4 single crystals were synthesized by the floating zone method equipped with four xenon arc lamps, and the photoluminescence (PL), scintillation, and dosimetric ...properties were investigated. The Ce-doped crystals showed PL emission peaks at around 420 and 720 nm. The former was ascribed to the 5 d-4f transition of Ce3+ ion, and the latter was ascribed Mg deficiency. The PL decay time profiles of the Ce-doped crystals exhibited the fast decay, and the decay time constants were the typical value of others Ce-doped materials. Thus, the decay time constants were attributed to the 5 d-4f transitions of Ce3+ ion. In addition, optically-stimulated luminescence (OSL) signals could be detected in all the crystals when the stimulation wavelength was 470 nm. The OSL dose response functions showed linearly proportional relationship from 10 to 1000 mGy in all the Ce-doped crystals. The thermally-stimulated luminescence (TSL) glow curves exhibit three peaks due to antisite of Al3+ ion, V center and antisite of Mg2+ ion. All the Ce-doped crystals showed improved TSL intensity and dose response sensitivity compared the undoped crystal. The 0.2 and 1% Ce-doped crystals showed linearly response at the dose range of the 0.1–1000 mGy.
•We have synthesized MgAl2O4 single crystal doped with Ce by floating zone method.•We have characterized the photoluminescence, scintillation and dosimetric properties.•All samples showed luminescence properties due to some defects and Ce3+ ion.
Eu2O3-doped tellurite glasses (15WO3–5Al2O3–80TeO2) were fabricated and their scintillation characteristics were investigated. Typical emissions originating from the 4f→4f transitions of Eu3+ were ...observed at 580, 592, 614, 653, and 702 nm when irradiated with visible light. The quantum yield of the Eu2O3-doped glass increased as the Eu2O3 concentration increased, and the 5.0% Eu2O3-doped glass exhibited the largest quantum yield of 76%. Further, scintillation originating from the 4f→4f transition of Eu3+ was also detected under X-ray irradiation, and the integrated scintillation intensity depended on the quantum yield. The afterglow levels of the glasses decreased with increasing the Eu2O3 concentration, and the level of the 5.0% Eu2O3-doped glass was 193 ppm, which was close to that of the Tl-doped CsI.
•Eu2O3-doped tellurite glasses were synthesized by melt-quenching method.•Photoluminescence and scintillation due to the 4f-4f transitions of Eu3+ were observed.•The afterglow levels of the Eu2O3-doped tellurite glasses were 193–553 ppm.
The Tm-doped MgAl2O4 single crystals were synthesized by using Xe arc lamps-equipped floating zone furnace. The synthesized crystals exhibited luminescence due to the 4f-4f transitions of Tm3+ in ...photoluminescence (PL), scintillation, and thermally stimulated luminescence (TSL). In all of PL, scintillation, and TSL, the 0.5% Tm-doped crystal showed the highest luminescence intensity. In TSL dose response functions, the 0.5% Tm-doped crystal showed sensitivity from X-ray irradiation with 0.1 mGy. In addition, we measured linear energy transfer (LET) dependence on TSL glow curve of the crystal and X-ray imaging test taken by TSL. We revealed the spatial resolution of the crystal was 100 μm.
•We have characterized the photoluminescence, scintillation, and dosimetric properties of Tm-doped MgAl2O4 single crystals.•All the crystals showed luminescence properties due to Tm3+ ion.•We revealed possibility of Tm-doped MgAl2O4 crystal for personal dosimetry, 2D dosimetry, and heavy ion beam measurement.
Mn-doped MgAl
2
O
4
single crystals were synthesized by the floating zone method equipped with four xenon arc lamps, and photoluminescence (PL), scintillation, and dosimetric properties were ...investigated. In PL and scintillation spectra, Mn-doped crystals showed an emission peak at 520 nm. The luminescence was ascribed to the d–d transition of Mn
2+
ion judging from the emission wavelength and decay time constants. In addition, Mn-doped crystals showed thermally and optically stimulated luminescence (TSL and OSL) with the emission peak at 520 nm, which was also considered to be due to the d–d transition of Mn
2+
ion. In both TSL and OSL dose–response functions, the 0.1% Mn-doped crystal showed linearly response from 0.01 to 1000 mGy.
Tb-doped Mg
2
SiO
4
single crystals were grown by floating zone method, and photoluminescence (PL), scintillation, and thermally stimulated luminescence (TSL) properties were evaluated. In the PL and ...scintillation properties, Tb-doped Mg
2
SiO
4
single crystals showed emission peaks at 380, 420, 440, 460, 480, 495, 550, 590, and 630 nm, and the derived decay time constants were typical for the 4f-4f transitions of Tb
3+
ions. Regarding the dosimetric properties, TSL glow curves represented the main peaks at 50, 200, and 350 °C, and the TSL spectra exhibited the nine emission peaks due to Tb
3+
ions. Compared with a commercial TSL dosimeter (TORECK, MSO-S) equipped with powder-form Tb-doped Mg
2
SiO
4
, the integrated TSL intensity of the 0.4% Tb-doped single crystal was higher than that of MSO-S element in the dose range from 0.01 to 100 mGy
air
.
Undoped, 0.5, 1.0, and 2.0% Nd-doped Bi4Si3O12 (BSO) crystals were synthesized by the floating zone method. Regarding photoluminescence (PL) properties, all samples had emission peaks due to the ...6p–6s transitions of Bi3+ ions. In addition, the Nd-doped samples had emission peaks due to the 4f–4f transitions of Nd3+ ions as well. The PL quantum yield of the 0.5, 1.0, and 2.0% Nd-doped samples in the near-infrared range were 67.9, 73.0, and 56.6%, respectively. Regarding X-ray-induced scintillation properties, all samples showed emission properties similar to PL. Afterglow levels at 20 ms after X-ray irradiation of the undoped, 0.5, 1.0, and 2.0% Nd-doped samples were 192.3, 205.9, 228.2, and 315.4 ppm, respectively. Dose rate response functions had good linearity from 0.006 to 60 Gy/h for the 1.0% Nd-doped BSO sample and from 0.03 to 60 Gy/h for the other samples.
Undoped and Tb-doped MgAl2O4 transparent ceramics were synthesized by the Spark Plasma Sintering (SPS) method, and dosimetric properties were investigated. The Tb-doped sample showed thermally ...stimulated luminescence (TSL) and optically stimulated luminescence (OSL), in which the emission center was Tb3+ ions. The TSL glow peaks of the Tb-doped sample are detected at 64, 151, 235, 299, and 385 °C. The Tb-doped sample had a linear TSL response in a dose range from 0.01 to 1000 mGy.
•Undoped and Tb-doped MgAl2O4 transparent ceramics were synthesized by the Spark Plasma Sintering (SPS) method.•Thermally stimulated luminescence (TSL) and optically stimulated luminescence (OSL) properties were investigated.•The Tb-doped MgAl2O4 transparent ceramic had a linear TSL response in a dose range from 0.01 to 1000 mGy.
We report radio-photoluminescence (RPL) properties of Sm-doped Al4SiO8 single crystals as a new RPL material. The Sm-doped Al4SiO8 single crystals were synthesized by the floating zone method. In PL ...emission spectra, the emission peaks due to the 4f-4f transitions of Sm3+ ions and 2EJ–4A2 transitions of Cr3+ ions were observed before X-ray irradiation, and the ones due to the 4f-4f transitions of Sm2+ appeared as well as Sm3+ after X-ray irradiation. The RPL dose response functions showed linear response from 1 mGy to 10 Gy for the 2.0% Sm-doped sample and from 10 mGy to 10 Gy for the others. Sm2+ ions of the new emission center completely disappeared by heat treatment at 500 °C for 10 min.
•We report radio-photoluminescence (RPL) properties of Sm-doped Al4SiO8 single crystals as a new RPL material.•We have synthesized Sm-doped Al4SiO8 single crystals by floating zone method.•The PL emission peaks were detected due to 4f-4f transitions of Sm3+ ions before X-ray irradiation and due to 4f-4f transitions of both Sm2+ and Sm3+ ions after X-ray irradiation.•The RPL responses of the 0.5, 1.0, and 3.0% Sm-doped samples had a proportional relationship in the range of 10 mGy to 10 Gy, and that of the 2.0% Sm-doped sample had a proportional relationship in the range of 1 mGy–10 Gy.
TSL and OSL properties of Eu-doped LiMgAlF6 Yanagida, Takayuki; Kato, Takumi; Takebuchi, Yuma ...
Radiation measurements,
March 2020, 2020-03-00, Letnik:
132
Journal Article
Recenzirano
Different concentrations of Eu doped LiMgAlF6 samples were synthesized by the spark plasma sintering (SPS) method. In photoluminescence (PL) measurements, emission due to 5d-4f transition of Eu2+ was ...observed at 370 nm, and PL decay times resulted 1.1–2.8 μs. When we irradiated X-rays, scintillation emissions due to Eu2+ and Eu3+ were detected at 370 and 600 nm, respectively. Optically stimulated luminescence (OSL) and thermally stimulated luminescence (TSL) were also observed in Eu-doped LiMgAlF6, and especially, TSL intensity was very high.
•We prepared Eu-doped LiMgAlF6 ceramic by the spark plasma sintering method.•Photoluminescence and scintillation properties were investigated.•Optically and themelly stimulated luminescence properties were evaluated.
