OSL and TA-OSL properties of Li2B4O7:Al for radiation dosimetry

Sahil,; Kumar, Rajesh; Yadav, Mukesh; Kumar, Pratik

doi:10.1016/j.jallcom.2022.164628

Cited by 7 publications

(4 citation statements)

References 37 publications

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“…All analyses were carried out in MATLAB ("MATLAB," 2020) and Python, using in-house developed software packages OHBA Software Library ("OSL MATLAB," n.d.; Quinn et al, 2022), HMM-MAR, OSL-dynamics (Gohil, 2023). The TINDA package is available for MATLAB (van Es and Higgins, 2023), and Python (Gohil, 2023).…”

Section: Methodsmentioning

confidence: 99%

“…Other age-dependent changes in brain activity are ubiquitous and include a slowing in the power spectrum (Quinn et al, 2023), and a decrease in network connectivity (Q. Geerligs et al, 2015;He et al, 2020;King et al, 2018;Schlesinger et al, 2017, Gohil et al 2023, which has been related to a decrease in the segregation of functional networks. A post-hoc analysis of the current data (Fig S9 ) showed an overall decrease in cycle strength and increase in rate for states that decrease in connectivity with age, and the opposite for states of which connectivity increased with age.…”

Section: Cycle Dynamics and Agementioning

confidence: 99%

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Large-scale cortical networks are organized in structured cycles

Higgins

Gohil

et al. 2023

Preprint

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The human brain exhibits recurrent oscillatory activity in cortical networks of neuronal populations, which are thought to play a role in specialized cognitive functions. However, it is not known whether these oscillatory network states evolve over time in a structured or random matter. In this study, we introduce a new method for analyzing the long-term evolution of these states, and demonstrate that they follow a cyclical architecture when the brain is at rest, with typical cycle durations of 300-500 milliseconds. This cyclical organization structure positions the default mode network (DMN) and dorsal attention network (DAN) at opposite phases of the cycle, with the DMN preceded by higher frequency oscillations in sensorimotor networks and followed by lower frequency oscillations in frontotemporal networks respectively. The cyclical structure was robust in three large magnetoencephalography (MEG) resting state datasets, and persists in a visuo-motor task, where cycle phase predicts reaction time. Moreover, individual cyclical dynamics were predictive of demographics: older people deviate less from the cycle structure and show a general slowing of cycle rate, and cycle rate is strongly heritable. These findings suggest that the evolution of oscillatory network states in the human brain may be more organized than previously thought and provide potential biomarkers for health and disease.

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Section: Methodsmentioning

confidence: 99%

Section: Cycle Dynamics and Agementioning

confidence: 99%

Large-scale cortical networks are organized in structured cycles

Higgins

Gohil

et al. 2023

Preprint

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“…Lithium tetraborate is a promising nonlinear material for laser frequency conversion, including for generating the fourth and fifth harmonics of Nd:YAG lasers [1] and sub-terahertz radiation [2]. In addition, following Sahil et al [3] and Mehrabi et al [4], Li 2 B 4 O 7 crystals (doped with various impurities) have wide application possibilities in radiation dosimetry. The study by J. Puebla et al [5] indicates that other applications of Li 2 B 4 O 7 include surface and bulk acoustic wave devices, cellular phones, and data transmission devices.…”

Section: Introductionmentioning

confidence: 99%

Elastic-plastic properties of Li2B4O7 determined by nanoindentation

Chobal,

Myslo

et al. 2023

Scientific Herald of Uzhhorod University Series Physics

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Relevance. Crystalline and amorphous lithium tetraborate (Li2B4O7) has a wide range of practical applications due to its physical properties. The knowledge of the mechanical characteristics of the surface layers of these materials, which are studied by nanoindentation, is necessary for optimising the technological processes for obtaining “optically perfect” samples. Aim. A comparative study of the mechanical properties and deformation mechanisms of glassy and crystalline Li2B4O7 samples in a wide range of applied loads. Methodology. The elastic-plastic properties of crystalline and glassy lithium tetraborate were investigated using the multiple-loading cyclic nanoindentation method. The samples were measured at maximum loading forces of 50, 100, 150, 200, 250, 300, 350, 400, 450, and 500 mN. Four measurements (in the form of a 2x2 matrix) were made at a distance of 50 µm from each other on each sample and at each load. Young’s modulus, hardness, and Poisson’s ratio of Li2B4O7 glass were also calculated using the Makishima-Mackenzie theory. Results. The load-displacement curves and graphs of the dependence of the average contact pressure on the displacement of the diamond Berkovich indenter were obtained, which have a “smooth” shape and no anomalies associated with “pop-in” or “pop-out” effects. The indentation modulus (Young’s modulus E) and hardness H of the studied samples were obtained from the experimental P-h load-displacement diagrams. The measured values mainly depend on the applied load or the contact depth of the indenter penetration into the crystalline and vitreous lithium tetraborate. Conclusions. Both the hardness and Young’s modulus of Li2B4O7 glass are lower than those of the single crystal, indicating a lower resistance of amorphous lithium tetraborate to elastic and plastic deformations. The obtained experimental values of hardness and Young’s modulus of Li2B4O7 glass correlate well with the results of the calculation within the framework of the Makishima-Mackenzie theory. Multiple-loading cyclic nanoindentation leads to deformation densification of glassy Li2B4O7 due to changes in the angles and lengths of chemical bonds, which leads to a decrease in the free volume in the medium-order structure of glass, as well as a change in the coordination of Boron atoms relative to Oxygen, i.e., the transformation of three-coordinated Boron into four-coordinated Boron

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“…Lithium tetraborate (Li2B4O7) (LTB) has attracted the attention of researchers for application in radiation dosimetry due to its effective atomic number -Zeff (7.3), which is close to that of the human tissue [5,6,7]. This is an important characteristic for dosimetry of medical applications of ionizing radiation [8].…”

Section: Introductionmentioning

confidence: 99%

TL and OSL study of Li2B4O7:Cu,Ag synthesized by combustion and solid-state reactions

Amorim¹,

Asfora

Pessoa³

et al. 2022

Braz. J. Rad. Sci.

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The aim of this work was to investigate the Thermoluminescence (TL) and the Optically Stimulated Luminescence (OSL) responses of Li2B4O7: Cu, Ag synthesized using two method: a) solid-state and b) liquid combustion methods. In both procedures 0.4% mol of CuN2O6.3H2O and 0.1%mol of AgNO3 were used as dopants. The techniques of X-ray diffraction (XRD) and scanning electron microscopy (SEM) were used for structural and morphological characterization. The results showed that the samples synthesized using the combustion method are mostly formed by Li2B4O7:Cu,Ag, while those produced by the solid-state method showed the presence of LiBO2. This fact affects the luminescence response of the samples, Those produced by combustion have higher TL and OSL sensitivities. The IRSL response was not observed for both sample’s batch. Future studies will be carried out to evaluate the use of Li2B4O7:Cu,Ag synthesized by solid-state for high dose dosimetry.

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OSL and TA-OSL properties of Li2B4O7:Al for radiation dosimetry

Cited by 7 publications

References 37 publications

Large-scale cortical networks are organized in structured cycles

Large-scale cortical networks are organized in structured cycles

Elastic-plastic properties of Li2B4O7 determined by nanoindentation

TL and OSL study of Li2B4O7:Cu,Ag synthesized by combustion and solid-state reactions

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