Characterization of the optically stimulated luminescence (OSL) response of beta-irradiated alexandrite-polymer composites

Nunes, M.C.S.; Lima, Leonardo Santos; Yoshimura, Elisabeth Mateus; França, Leonardo V.S.; Baffa, Oswaldo; Jacobsohn, L.G.; Malthez, Anna Luiza Metidieri Cruz; Künzel, Roseli; Trindade, Neilo Marcos

doi:10.1016/j.jlumin.2020.117479

Cited by 13 publications

(6 citation statements)

References 30 publications

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“…The B band is located between 400 and 450 nm and represents the absorption of Cr 3+ and Fe 3+ ions, also incorporated in different symmetrical sites [12,13]. The R lines (located at 680 nm [13][14][15]) are related to Cr 3+ ions present in the Al2 sites [6,16,17]. The mineral also has a band located in the ultraviolet spectral region, which is related to Cr 3+ ions in the sample (in agreement with SEM-EDS analysis [18]).…”

Section: Experimental Proceduresupporting

confidence: 71%

“…According to [7,10] each TL curve is linked to a trapping center of the material, and in the case of alexandrite the deepest trap centers are those of peak IV and V that corresponds to the most intense TL emission. Correlating with the OSL components we can verify that the slow component is the most intense of the three, and therefore probably can be linked to deeper traps such as peak IV and V. This result was also verified in samples of alexandrite mixed with a fluorinated polymer [6]. Using the following relation τ = 1/𝛼𝛼 [5,25], we can find the decay time of each OSL component, for the slow τ = 40.86 s, for the medium τ = 4.93 s and for the fast τ = 0.78 s. Additional results related to this work can be found in [6,26].…”

Section: Tl and Oslsupporting

confidence: 68%

“…For OSL analysis, deconvolutions of the OSL curves were also performed using the R Studio software [23,24]. When performing deconvolutions in R Studio, it is possible to obtain parameters such a proportion of the charges initially trapped at type i trap (n0i) as well as the charge escape probability (𝛼𝛼i) [6]. Fig.…”

Section: Tl and Oslmentioning

confidence: 99%

“…However, for most of them, the physical properties have not been investigated. As already reported by some authors [3,[6][7][8][9], minerals may present luminescent properties and can be of interest in the dosimetry field. In this work, the potential of natural alexandrite (BeAl 2O4:Cr 3+ ) as an ionizing radiation dosimeter was investigated by thermoluminescence (TL) and optically stimulated luminescence (OSL) measurements.…”

Section: Introductionmentioning

confidence: 97%

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Alexandrite: investigation of a natural material for radiation dosimetry

Trindade

Nunes

Dardengo

et al. 2022

J. Phys.: Conf. Ser.

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In this work we performed experimental analyses of the dose-response curves of natural alexandrite, using thermoluminescence (TL) and optically stimulated luminescence (OSL). The natural alexandrite crystals from Bahia, Brazil, were pulverized and the optical absorption measurements were carried out in the range of 200 to 800 nm, comparing a non-irradiated sample with a 10 Gy beta irradiated one. OSL and TL measurements were performed using the Risø equipment (model DA-20) with irradiation doses from 1 to 5 Gy. Glow curve analysis was done using GlowFit software for TL, and R Studio software for OSL measurements. The irradiated sample (10 Gy) shows an absorption spectrum similar to the non-irradiated one, containing the same bands. The samples of natural alexandrite showed a linear dose-response for both OSL and TL measurements. From the TL and OSL analyses, it was possible to infer a correlation between the slow OSL component with the most intense TL peaks of alexandrite.

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Section: Experimental Proceduresupporting

confidence: 71%

Section: Tl and Oslsupporting

confidence: 68%

Section: Tl and Oslmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 97%

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Alexandrite: investigation of a natural material for radiation dosimetry

Trindade

Nunes

Dardengo

et al. 2022

J. Phys.: Conf. Ser.

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“…Repeatability is a feature of one part measured multiple times to analyze the sum of each difference by the same operator. Reproducibility is a feature of the same part measured using measuring tools that analyze the sum of different operators [17,18]. Experimentally, the non-contact optical detection adopts the repeatability measurement [19,20].…”

Section: Principle Of Detected Debris On the Tft-lcdmentioning

confidence: 99%

Non-Contact Optical Detection of Foreign Materials Adhered to Color Filter and Thin-Film Transistor

2022

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This paper describes the non-contact optical detection of debris material that adheres to the substrates of color filters (CFs) and thin-film transistors (TFTs) by area charge-coupled devices (CCDs) and laser sensors. One of the optical detections is a side-view illumination by an area CCD that emits a coherency light to detect debris on the CF. In contrast to the height of the debris material, the image is acquired by transforming the geometric shape from a square to a circle. As a result, the side-view illumination from the area CCD identified the height of the debris adhered to the black matrix (BM) as well as the red, green, and blue of a CF with 95, 97, 98, and 99% accuracy compared to the golden sample. The uncertainty analysis was at 5% for the BM, 3% for the red, 2% for the green, and 1% for the blue. The other optical detection, a laser optical interception with a horizontal alignment, inspected the material foreign to the TFT. At the same time, laser sensors intercepted the debris on the TFT at a voltage of 3.5 V, which the five sets of laser optics make scanning the sample. Consequently, the scanning rate reached over 98% accuracy, and the uncertainty analysis was within 5%. Thus, both non-contact optical methods can detect debris at a 50 μm height or lower. The experiment presents a successful design for the efficient prevention of a valuable component malfunction.

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Passive Dosimeters for Radiation Dosimetry: Materials, Mechanisms, and Applications

Yang,

Vrielinck,

Jacobsohn

et al. 2024

Adv Funct Materials

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Passive dosimeters enabling accurate measurement of doses from gamma rays to visible light are necessary to ensure efficient utilization of electromagnetic radiation in numerous fields like medical diagnostics and industrial manufacturing. The specific requirements for dosimeters in terms of dosimetry range, sensitivity, accuracy, and stability for each application have led to the development of various dosimeters based on new materials and new mechanisms. Here, a comprehensive review of different types of dosimeters classified according to the response signal, namely electron paramagnetic resonance, electrical, and optical, is provided. This review starts with a general introduction to dosimetry, a classification of dosimeters, and an elucidation of the necessity of dosimeters in various ranges of the electromagnetic spectrum. This is followed by an overview of the fundamental requirements of dosimeters, an explanation of the general dosimetry procedure, and the dosimetric quantities. Emphasis is given to the working mechanism, the design concept, and applications of each type of dosimeter as well as their respective strengths and drawbacks. Challenges and prospects are presented at the end of the review. This review provides an insightful overview of the material‐mechanism‐characteristics‐application relationship of different types of dosimeters that hopefully can serve as inspiration for the development of new devices.

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Characterization of the optically stimulated luminescence (OSL) response of beta-irradiated alexandrite-polymer composites

Cited by 13 publications

References 30 publications

Alexandrite: investigation of a natural material for radiation dosimetry

Alexandrite: investigation of a natural material for radiation dosimetry

Non-Contact Optical Detection of Foreign Materials Adhered to Color Filter and Thin-Film Transistor

Passive Dosimeters for Radiation Dosimetry: Materials, Mechanisms, and Applications

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