Optically stimulated luminescence: Searching for new dosimetric materials

Yoshimura, Elisabeth Mateus; Yukihara, E.G.

doi:10.1016/j.nimb.2006.04.134

Cited by 51 publications

(18 citation statements)

References 10 publications

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“…In addition, normalization of the OSL responses to their responses beta radiation proved to be efficient in decreasing uncertainties related to differences in dosimeters shape, size and uniformity caused by the manual processing of fractionating the tape and, also, by non-stability of the reader. Some advantages of the OSL technique over the TL technique found by other authors were also identified in the present study (Bøtter-Jensen et al, 2003;uz Zaman, Fatima, Naqvi, Parveen, & Sajjad, 2016;Yoshimura & Yukihara, 2006). Since the readout of the TL materials is a thermal process, it demands a reliable and reproducible heating system.…”

Section: Discussionsupporting

confidence: 66%

Avaliação de doses em órgãos em procedimentos de tomografia computadorizada utilizando dosímetros TL e OSL

Martins¹

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Since the development of the first Computed Tomography (CT) equipment in the early 1970s, this diagnostic imaging modality has gone through several improvements. Exclusively digital and high quality images production without superposition of anatomical structures, examinations as fast as five seconds, and the capability of diagnosing important pathologies with no need of exploratory surgeries are some of the great advantages when using this technique. As a consequence, the role of this diagnostic procedure has been widely increasing worldwide. In the US, for instance, 2.2 million CT exams were performed in 1980, only 10 years after its implementation. This number increased to 78.7 million in 2015. As a result, absorbed dose by patients due to this technique has become a concern among radiologists, researchers and manufacturers, leading to the development of different methodologies to evaluate it. Ionization chambers, thermoluminescence (TL) and, more recently, optically stimulated luminescence (OSL) dosimetry, for instance, have been widely applied in order to estimate in vivo organ doses, in post-mortem subjects and in phantoms. Another approach that has been extensively used are the Monte Carlo simulations, which can be applied in comparison with experimental results. An experimental approach to evaluate organ doses in pediatric and adult anthropomorphic phantoms by using TLDs and OSLDs was employed in the present study. Several analyses were performed in order to stablish the best way to achieve the main results in this investigation and the methodology proved to be efficient. The characteristics of the OSLDs were analyzed to verify their applicability for evaluating doses from CT procedures. The characterization included homogeneity, linearity with the incident air kerma, reproducibility, reusability and an energy-dependent response to distinct effective energies evaluation. These dosimeters were applied along with TLDs in an adult and a pediatric anthropomorphic phantoms to evaluate organ doses due to clinical CT protocols. These protocols were selected after an analysis of patient data collected from the

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Section: Discussionsupporting

confidence: 66%

Avaliação de doses em órgãos em procedimentos de tomografia computadorizada utilizando dosímetros TL e OSL

Martins¹

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“…In the present study, the weak excitation peak observed at 337 nm suggests that the interaction between O 2− and Eu 3+ is stronger; hence the efficiency of the energy transfer process from the charge transfer band (256 nm) to Eu 3+ emitting levels increases. The f-f transitions within the Eu 3+ , 4f 6 configuration in longer spectral region with 7 F 0 → 5 D 3 (337 nm) is the most prominent group [19].…”

Section: Resultsmentioning

confidence: 99%

“…These trapped charge carriers are localized in the lattice [6]. Thermoluminescence (TL) is a powerful technique to study these charge carriers.…”

Section: Introductionmentioning

confidence: 99%

Photoluminescence and thermoluminescence studies of Mg2SiO4:Eu3+ nano phosphor

Prashantha

Lakshminarasappa

Nagabhushana

2011

Journal of Alloys and Compounds

119

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Phosphor Photoluminescence Thermoluminescence Optical absorption a b s t r a c t Nanoparticles of Eu 3+ doped Mg 2 SiO 4 are prepared using low temperature solution combustion technique with metal nitrate as precursor and urea as fuel. The synthesized samples are calcined at 800• C for 3 h. The Powder X-ray diffraction (PXRD) patterns of the sample reveled orthorhombic structure with ␣-phase. The crystallite size using Scherer's formula is found to be in the range 50-60 nm. • C and 345• C besides a shoulder with peak at ∼240• C are observed. The trapping parameters-activation energy (E), order of kinetics (b) and frequency factor (s) are calculated using glow curve shape method and the results obtained are discussed.

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“…(2) OSL and PL Measurements All glasses were tested for OSL using a method similar to a previous study. 12 Two sample preparation methods were used. In the first instance, samples were cut and polished to small slides of approximately 3 mm Â 3 mm Â 1 mm.…”

Section: Methodsmentioning

confidence: 99%

Optically Stimulated Luminescence in Fluoride–Phosphate Glass for Radiation Dosimetry

Kalnins

Ebendorff-Heidepriem

Spooner

et al. 2010

Journal of the American Ceramic Society

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Optically stimulated luminescence (OSL) was studied in undoped and rare‐earth doped fluoride–phosphate glass. Following exposure to 90Sr/90Y β‐radiation, the samples demonstrated strong OSL in the 350–600 nm wavelength range. Here, we explore the effects of fabrication conditions and rare‐earth dopants on the OSL. We found that the OSL intensity increases linearly with radiation dosage, indicating the suitability of fluoride–phosphate glass as a dosimeter material.

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Optically stimulated luminescence: Searching for new dosimetric materials

Cited by 51 publications

References 10 publications

Avaliação de doses em órgãos em procedimentos de tomografia computadorizada utilizando dosímetros TL e OSL

Avaliação de doses em órgãos em procedimentos de tomografia computadorizada utilizando dosímetros TL e OSL

Photoluminescence and thermoluminescence studies of Mg2SiO4:Eu3+ nano phosphor

Optically Stimulated Luminescence in Fluoride–Phosphate Glass for Radiation Dosimetry

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