Dosimetric characterization of MgB4O7:Ce,Li as an optically stimulated dosimeter for photon beam radiotherapy

Souza, Luiza Freire de; Souza, Divanízia N.; Rivera, Gerardo B.; Vidal, Rogério Matias; Caldas, Linda V.E.

doi:10.1016/j.pisc.2019.100397

Cited by 16 publications

(6 citation statements)

References 8 publications

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“…In most works involving Ce-doped and Li-co-doped MgB 4 O 7 materials, the nominal Li concentration is higher than the Ce concentration. 6,7,12,54,55 However, according to some authors, part of the Li amount is lost during synthesis, and the amount of Li in the final product is considerably lower than the concentration of Li added to the initial solution. 6,9 For this reason, even with Li concentrations of 10%, the phases involving Li are not observed in X-ray diffractograms, as expected in materials with Li concentration of this order of magnitude.…”

Section: Papermentioning

confidence: 99%

Unlocking the effect of Li and Ce ions on the thermoluminescence and optically stimulated luminescence signals of the MgB₄O₇ compound

et al. 2023

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Section: Papermentioning

confidence: 99%

Unlocking the effect of Li and Ce ions on the thermoluminescence and optically stimulated luminescence signals of the MgB₄O₇ compound

et al. 2023

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“…LBO and MBO compounds have stood out in dosimetry for their applicability in thermal neutron dosimetry. In general, magnesium tetraborate shows high sensitivity in thermoluminescent dosimetry and lithium tetraborate has high UV transmittance for certain wavelengths [11,12,15,34].…”

Section: Dosimetric Characteristics Of Mbo and Lbomentioning

confidence: 99%

“…In a comparative study on the use of MgB4O7:Ce,Li, Al2O3:C and a neutron sensitive detector prepared using a mixture of Al2O3:C and 6 Li2CO3, it was observed that MgB4O7:Ce,Li samples enriched with B-10 showed an OSL signal comparable to that of the other two dosimeters [11]. Souza et al [12] studied the use of MgB4O7:Ce,Li for OSL dosimetry of neutrons produced in the interaction of megavoltage photon beams. Recently, using a Monte Carlo simulation, Moreira et al [13] evaluated the sensitivity of the vinyl polychloride (PVC) films loaded with MgB4O7 for the detection of thermal neutrons and observed significant differences regarding the type of boron isotope present in the luminescent sensitivity of the films.…”

Section: Introductionmentioning

confidence: 99%

Challenges in personal and clinical dosimetry using Li2B4O7 and MgB4O7 as TLD and OSLD

Oliveira¹,

Souza²,

Donald³

et al. 2022

Braz. J. Rad. Sci.

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Thermoluminescent (TLD) and optically stimulated luminescent dosimeters (OSLD) are essential in radiation dosimetry. Such dosimeters can be easily transported due to their small size and can be used in in vivo dosimetry and anthropomorphic simulations. In this work, the dosimetric properties of Li2B4O7 and MgB4O7 compounds were evaluated based on their response to the applied stimulus, whether thermal or optical. The linear dose response range of the luminescent signal, its fading, the lowest detectable dose, and reproducibility are important parameters in determining a good dosimeter for clinical and personal dosimetry. Therefore, the objective of this work was, based on studies performed by other authors on dosimetric characterizations of doped a codoped Li2B4O7 and MgB4O7, to point out those compounds with the greatest potential for applications in personal and clinical dosimetry using TL and OSL techniques. Considering the results described in other works, the materials that stood out for use in personal and clinical dosimetry were Li2B4O7:Cu and MgB4O7:Dy,Na. In several of the reported studies, no data related to LDD, fading and reproducibility of the luminescent signal of the investigated compounds were found. Therefore, there are many possibilities for investigations into these two types of compounds for the purpose of their use in personal and clinical dosimetry. Further studies will provide a broader scientific basis for choosing appropriate dosimetric materials for these applications.

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“…To address these issues, MgB 4 O 7 :Ce,Li has been put forward as a suitable candidate in response to these challenges, as it exhibits a luminescence lifetime of 31.5 ns and a reduced quenching at high LET values; in addition, its matrix is tissue equivalent (Z eff = 8.5), it has not shown effects of aging, can be reused, and it is not toxic [6][7][8]. Additionally, De Souza et al [9] tested the OSL dose response of MgB 4 O 7 :Ce,Li irradiated in photon beams (6 MV and 10 MV), in the dose range (0.1-100) Gy, and found a response proportional to the absorbed dose at those energies. Despite its novelty, there is now a substantial amount of information in the literature from different laboratories reporting on the synthesis of this material, its properties and its potential.…”

Section: Introductionmentioning

confidence: 99%

Addressing Current Challenges in OSL Dosimetry Using MgB4O7:Ce,Li: State of the Art, Limitations and Avenues of Research

et al. 2023

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The objective of this work is to review and assess the potential of MgB4O7:Ce,Li to fill in the gaps where the need for a new material for optically stimulated luminescence (OSL) dosimetry has been identified. We offer a critical assessment of the operational properties of MgB4O7:Ce,Li for OSL dosimetry, as reviewed in the literature and complemented by measurements of thermoluminescence spectroscopy, sensitivity, thermal stability, lifetime of the luminescence emission, dose response at high doses (>1000 Gy), fading and bleachability. Overall, compared with Al2O3:C, for example, MgB4O7:Ce,Li shows a comparable OSL signal intensity following exposure to ionizing radiation, a higher saturation limit (ca 7000 Gy) and a shorter luminescence lifetime (31.5 ns). MgB4O7:Ce,Li is, however, not yet an optimum material for OSL dosimetry, as it exhibits anomalous fading and shallow traps. Further optimization is therefore needed, and possible avenues of investigation encompass gaining a better understanding of the roles of the synthesis route and dopants and of the nature of defects.

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Dosimetric characterization of MgB4O7:Ce,Li as an optically stimulated dosimeter for photon beam radiotherapy

Cited by 16 publications

References 8 publications

Unlocking the effect of Li and Ce ions on the thermoluminescence and optically stimulated luminescence signals of the MgB₄O₇ compound

Unlocking the effect of Li and Ce ions on the thermoluminescence and optically stimulated luminescence signals of the MgB₄O₇ compound

Challenges in personal and clinical dosimetry using Li2B4O7 and MgB4O7 as TLD and OSLD

Addressing Current Challenges in OSL Dosimetry Using MgB4O7:Ce,Li: State of the Art, Limitations and Avenues of Research

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Dosimetric characterization of MgB4O7:Ce,Li as an optically stimulated dosimeter for photon beam radiotherapy

Cited by 16 publications

References 8 publications

Unlocking the effect of Li and Ce ions on the thermoluminescence and optically stimulated luminescence signals of the MgB4O7 compound

Unlocking the effect of Li and Ce ions on the thermoluminescence and optically stimulated luminescence signals of the MgB4O7 compound

Challenges in personal and clinical dosimetry using Li2B4O7 and MgB4O7 as TLD and OSLD

Addressing Current Challenges in OSL Dosimetry Using MgB4O7:Ce,Li: State of the Art, Limitations and Avenues of Research

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Unlocking the effect of Li and Ce ions on the thermoluminescence and optically stimulated luminescence signals of the MgB₄O₇ compound

Unlocking the effect of Li and Ce ions on the thermoluminescence and optically stimulated luminescence signals of the MgB₄O₇ compound