Nature of radiation resistance of LFS oxyorthosilicate crystals doped with Ce, Sc, Ca, and Y ions

Zavartsev, Yu. D.; Zavertyaev, M.; Zagumenniy, A. I.; Zerrouk, A. F.; Козлов, В. А.; Kutovoĭ, S. A.; Pestovskii, N. V.; Petrov, A. A.; Savinov, S. Yu.

doi:10.3103/s1068335616110051

Cited by 5 publications

(4 citation statements)

References 7 publications

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“…Therefore, a similar principle can be applied to other lutetium-based crystals such as LFS (lutetium fine silicate). For example, (Zavartsev et al 2016) has given the LFS definition of: Lu 2+2y Si 1−y O 5+y . In this case, if the lutetium concentration is obtained, the concentration of silicon and oxygen can also be obtained via the 'y' composition relation.…”

Section: Discussionmentioning

confidence: 99%

Determination of lutetium density in LYSO crystals: methodology and PET detector applications

Thien,

Nemallapudi

2024

Phys. Med. Biol.

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Objective: Lutetium yttrium oxyorthosilicate (LYSO) scintillation crystals are used in positron emission tomography (PET) due to their high gamma attenuation, fair energy resolution, and fast scintillation decay time. The enduring presence of the 176Lu isotope, characterized by a half-life of 37.9 billion years, imparts a consistent radiation background (BG) profile that depends on the geometry and composition attributes of the LYSO crystals.Approach: In this work, we proposed a methodology for estimating the composition of LYSO crystals in cases where the exact Lutetium composition remains unknown. The connection between BG spectrum intensity and intrinsic radioactivity enables precise estimation of Lutetium density in LYSO crystal samples. This methodology was initially applied to a well-characterized LYSO crystal sample, yielding results closely aligned with the known composition. The composition estimation approach was extended to several samples of undisclosed LYSO crystals, encompassing single crystal and crystal array configurations. Furthermore, we model the background spectrum observed in the LYSO-based detector and validate the observed spectra via simulations.Main results: The estimated Lutetium composition exhibited adequate consistency across different samples of the same LYSO material, with variations of less than 1%. The result of the proposed approach coupled with the simulation successfully models the background radiation spectra in various LYSO-based detector geometries.Significance: The implications of this work extend to the predictive assessment of system behaviors and the autonomous configuration parameters governing LYSO-based detectors.

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Section: Discussionmentioning

confidence: 99%

Determination of lutetium density in LYSO crystals: methodology and PET detector applications

Thien,

Nemallapudi

2024

Phys. Med. Biol.

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“…This result shows that the scintillation mechanism of Li:Sc:Ce:LSO crystal is persistent for the damage caused by the high-power ionizing radiation. Previous studies [4][5][6]9] showed that the Lutetium oxyorthosillicates with additional dopants are strongly radiation hard. Thus, the studied Li:Sc:Ce:LSO composition is suitable for direct measurements of beam parameters in large particle accelerators.…”

Section: Discussionmentioning

confidence: 99%

“…Additional doping of Ce:LSO by special divalent or trivalent ions improve its scintillation characteristics [3][4][5][6][7][8]. In particular, a co-doping of Ce:LSO by Ca 2+ and Mg 2+ leads to significant decay-time shortening [6][7][8].…”

Section: Introductionmentioning

confidence: 99%

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Wavelength-Resolved Photoluminescence and Cathodoluminescence Decay Times of LSO:Ce Scintillator CO-Doped with Lithium and Scandium

et al. 2021

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We study the luminescence decay times of Ce 3+ : Lu 2 SiO 5 scintillator, co-doped with Sc 3+ and Li + ions, under the direct photoexcitation of Ce 3+ ions at 337 nm and excitation by a pulsed electron beam with energies of 100 -300 keV. The cathodoluminescence (CL) and photoluminescence (PL) decay times of studied sample are equal within the experimental error. Two emission bands are found: in the range of 370 -480 nm ("high-energy band") and 500 -570 nm ("low-energy band"). The highenergy emission band has the decay times ∼40 ns. The low-energy emission band has the maximum decay time ∼60 ns at 545 nm. The observed results show that the transport stage of Li:Sc:Ce:Lu 2 SiO 5 scintillation mechanism is not affected by a high negative space charge and high density of electronic excitations provided by the high-power electron beam.

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Luminescence from oxygen vacancies in Lu2SiO5 crystal and ceramics at room temperature

Belov,

Koutovoi,

Kozlov

et al. 2023

Journal of Luminescence

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Nature of radiation resistance of LFS oxyorthosilicate crystals doped with Ce, Sc, Ca, and Y ions

Cited by 5 publications

References 7 publications

Determination of lutetium density in LYSO crystals: methodology and PET detector applications

Determination of lutetium density in LYSO crystals: methodology and PET detector applications

Wavelength-Resolved Photoluminescence and Cathodoluminescence Decay Times of LSO:Ce Scintillator CO-Doped with Lithium and Scandium

Luminescence from oxygen vacancies in Lu2SiO5 crystal and ceramics at room temperature

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