High quantum yield Tb3+ doped glass scintillator based on Ta2O5 and La2O3 in mixed glass former for synchrotron and medical x-rays imaging applications
Issued Date
2026-01-01
Resource Type
ISSN
0969806X
eISSN
18790895
Scopus ID
2-s2.0-105010109625
Journal Title
Radiation Physics and Chemistry
Volume
238
Rights Holder(s)
SCOPUS
Bibliographic Citation
Radiation Physics and Chemistry Vol.238 (2026)
Suggested Citation
Intachai N., Rachniyom W., Wantana N., Thanyaphirak W., Khrongchaiyaphum F., Sarumaha C.S., Pakawanit P., Phoovasawat C., Kanjanaboos P., Choodam K., Kim H.J., Tariwong Y., Niamin H., Kothan S., Kaewkhao J. High quantum yield Tb3+ doped glass scintillator based on Ta2O5 and La2O3 in mixed glass former for synchrotron and medical x-rays imaging applications. Radiation Physics and Chemistry Vol.238 (2026). doi:10.1016/j.radphyschem.2025.113113 Retrieved from: https://repository.li.mahidol.ac.th/handle/123456789/114733
Title
High quantum yield Tb3+ doped glass scintillator based on Ta2O5 and La2O3 in mixed glass former for synchrotron and medical x-rays imaging applications
Corresponding Author(s)
Other Contributor(s)
Abstract
In this work, high quantum yield glass scintillator based on Ta<inf>2</inf>O<inf>5</inf> and La<inf>2</inf>O<inf>3</inf> in mixed glass former (SiO<inf>2</inf>+B<inf>2</inf>O<inf>3</inf>) for synchrotron and medical x-rays imaging applications were developed. Glasses were fabricated by conventional melt quenching method in the ratio of xTb<inf>2</inf>O<inf>3</inf> - 10Ta<inf>2</inf>O<inf>5</inf>– 20La<inf>2</inf>O<inf>3</inf> - 10SrO – 10SiO<inf>2</inf> - (50-x)B<inf>2</inf>O<inf>3</inf> (x = 0, 1, 3, 5, 7, 9, 11, 13, 15). The results indicated that an increase in Tb<inf>2</inf>O<inf>3</inf> content enhanced the density, refractive index, molar volume, ion concentration, and effective atomic number of the glass, thereby making it heavier and more interaction with x-rays. Additionally, the reduced inter-ionic distance implies that the Tb<sup>3+</sup> ions are closer together. The closer ion concentration leads to quenching of photoluminescent light at 7.0 % mol of Tb<inf>2</inf>O<inf>3</inf> and a decrease in decay time value. The quantum yield achieved a maximum value of 77.5 % at the same concentration of Tb<inf>2</inf>O<inf>3</inf>. Absorption spectra clearly showed peaks at 486, 1903, and 2201 nm, indicating Tb<sup>3+</sup> ion in the glass matrix. The seven emission peaks were observed correspond to electron transitions from the <sup>5</sup>D<inf>4</inf> level to the <sup>7</sup>F<inf>j (j=0,1,2,3,4,5,6)</inf> states, respectively. Scintillation light was studied through radioluminescence spectra, and similar patterns were observed in photoluminescence. Scintillation decay times were measured using pulse x-ray excitation and results comparable to photoluminescence decay times in the millisecond range were obtained. High-quality images with maximum spatial resolution of 10 lp/mm were demonstrated using synchrotron and medical x-rays with the developed glass scintillator. The glass developed with 7.0 % mol of Tb<inf>2</inf>O<inf>3</inf> has properties that make it suitable for use as a scintillator in high-resolution X-ray imaging devices.