Properties of lithium aluminate for application as an OSL dosimeter

Twardak, A.; Bilski, P.; Marczewska, B.; Lee, J.I.; Kim, J.L.; Gieszczyk, W.; Mrozik, Anna; Sądel, M.; Wróbel, Dagmara

doi:10.1016/j.radphyschem.2014.05.046

Cited by 28 publications

(11 citation statements)

References 11 publications

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“…5,8 Other near tissue-equivalent materials such as aluminates and silicates have been found to suffer from the limitations of high fading of about 80% within a month and are highly hygroscopic in nature. 9 Compared to commercial Al 2 O 3 :C, a much lower sensitivity was achieved for LiAlO 2 :Cu,P and MgO:Tb. 10 Ammonium salts and Fluorosilicates such as NH 4 Br and (NH 4 ) 2 SiF 6 have also been reported to suffer from the higher fading of more than 80% within 10 hours.…”

Section: Introductionmentioning

confidence: 92%

Facile synthesis of KCl:Sm³⁺ nanophosphor as a new OSL dosimetric material achieved through charge transfer between the defect states

et al. 2017

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Since precise control of nanoscale features is in high demand, it is being exploited to develop and improve OSL dosimetric materials, where striking improvement might also be expected in lanthanide-doped metal halides. The major challenge in the development of a nanophosphor lies in avoiding the aggregation of a dopant element in host materials, which has long prevented an in-depth exploration for the same purpose. This study focuses on the synthesis and characterization of Sm-doped KCl nanophosphors to develop a novel accession to investigate the highly sensitive trivalent Sm-doped KCl phosphor. Herein, we were able to overcome the aggregation phenomena and we showed that Sm-doped KCl with 0.45 mol% of Sm, which is the optimised dopant concentration, exhibits the high-intensity luminescence performance under blue light stimulation for the gamma doses in the range from 100 mGy to 1000 Gy.This sensitivity is attributed to the uniform nanospheres encapsulated in KCl along with the predominant existence of a trivalent (Sm 3+ ) state, where these conditions can introduce additional defects centres.The presence of these additional defect centres was confirmed by photoluminescence studies, plausibly supporting the charge transfer due to the optical energy between these states, leading to high sensitivity.To establish KCl:Sm as a good OSL dosimetric materials (DM), we investigated fading, reusability, and reproducibility and compared these with those of commercial DM compounds such as Al 2 O 3 :C and BeO. Overall, Sm-doped KCl is non-toxic, cost-effective, robust, and a promising candidate for reusable dosimetry.

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Section: Introductionmentioning

confidence: 92%

Facile synthesis of KCl:Sm³⁺ nanophosphor as a new OSL dosimetric material achieved through charge transfer between the defect states

et al. 2017

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“…Lithium aluminates (LiAlO 2 ) are important materials in various health and energy applications. For instance, in dosimetry, γ‐LiAlO 2 is considered as a novel material for optically stimulated luminescence (OSL), offering a superior sensitivity to the conventional carbon‐doped Al 2 O 3 . In batteries, LiAlO 2 nanocrystals and mesoporous materials are critical components in the electrolyte composites .…”

Section: Introductionmentioning

confidence: 99%

Role of interfaces in damage process of irradiated lithium aluminate nanocrystals

Senor

Devanathan

2018

J Am Ceram Soc

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Molecular dynamics simulations were performed to understand the differences in the response of single crystal and nanocrystalline γ‐LiAlO2 to energy deposition by 10 keV Li recoils. The simulations are performed at 573 K and focus on the damage production in the absence of thermal annealing. The grain boundaries in the nanocrystals are found to be amorphous. Analyses of the fate of the beam ions show that the amorphous grain boundaries and differently oriented nanograins increase the number of backscattered ions and decrease the number of transmitted ions. Damaged regions protruding from the grain boundaries provide a direct evidence of the role of the grain boundaries as scattering centers in collision cascades. The simulations show that the defect density produced in the nanocrystals is about twice that in the single crystals. In both samples, Li defects account for 70% of the defects, demonstrating that LiO4 tetrahedra are much more susceptible to damage than AlO4 tetrahedra. Furthermore, Li defects occur preferentially near grain boundaries. Diffusion simulations confirm the limited thermal diffusion of defects at 573 K, effectively separating the damage production from thermal annealing in the irradiation simulations. Nevertheless, the mean square displacements of grain‐boundary defects are found to be larger than lattice defects and surface defects.

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“…Isotope 6 Li-enriched -LiAlO 2 has been proposed as a promising material for development of neutron dosimeters [1] and has been considered as a candidate for production of tritium in fusion reactor designs [2]. It has also been used as a solid breeder material in support of tritium readiness campaign [3].…”

Section: Introductionmentioning

confidence: 99%

Irradiation effects and hydrogen behavior in H2+ and He+ implanted γ-LiAlO2 single crystals

Jiang

Zhang

Kovařík

et al. 2017

Journal of Nuclear Materials

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Gamma-phase lithium aluminate (-LiAlO 2 ) is a breeder material for tritium, a necessary substance for strategic stockpile and fusion power systems. A fundamental study of structural evolution and tritium diffusion in -LiAlO 2 under displacive irradiation is needed to fully assess the material performance. This study utilizes ion implantation of protium (surrogate for tritium) and helium in -LiAlO 2 single crystals at elevated temperatures to emulate the irradiation effects. The results show that at 573 K there are two distinct disorder saturation stages to 1 dpa without full amorphization; overlapping implantation of H 2 + and He + ions suggests possible formation of gas bubbles. For irradiation to 10 21 H + /m 2 (0.36 dpa at peak) at 773 K, amorphization occurs at surface with H diffusion and dramatic Li loss; the microstructure contains bubbles and cubic LiAl 5 O 8 precipitates with sizes up to 200 nm or larger. In addition, significant H diffusion and release are observed during thermal annealing.

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Properties of lithium aluminate for application as an OSL dosimeter

Cited by 28 publications

References 11 publications

Facile synthesis of KCl:Sm³⁺ nanophosphor as a new OSL dosimetric material achieved through charge transfer between the defect states

Facile synthesis of KCl:Sm³⁺ nanophosphor as a new OSL dosimetric material achieved through charge transfer between the defect states

Role of interfaces in damage process of irradiated lithium aluminate nanocrystals

Irradiation effects and hydrogen behavior in H2+ and He+ implanted γ-LiAlO2 single crystals

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Properties of lithium aluminate for application as an OSL dosimeter

Cited by 28 publications

References 11 publications

Facile synthesis of KCl:Sm3+ nanophosphor as a new OSL dosimetric material achieved through charge transfer between the defect states

Facile synthesis of KCl:Sm3+ nanophosphor as a new OSL dosimetric material achieved through charge transfer between the defect states

Role of interfaces in damage process of irradiated lithium aluminate nanocrystals

Irradiation effects and hydrogen behavior in H2+ and He+ implanted γ-LiAlO2 single crystals

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Facile synthesis of KCl:Sm³⁺ nanophosphor as a new OSL dosimetric material achieved through charge transfer between the defect states

Facile synthesis of KCl:Sm³⁺ nanophosphor as a new OSL dosimetric material achieved through charge transfer between the defect states