Thermoluminescence emission on lead oxychloroborate glasses under UV exposure

Menezes, D.L.A.; Bannwart, E.S.; Souza, José Ezequiel de; Rojas, S. S.

doi:10.1002/bio.3691

Cited by 3 publications

(2 citation statements)

References 30 publications

(34 reference statements)

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“…The peak value of the average ρ(O 3 ) was observed to be 106.4 µg/m 3 at 14:00, while the minimal value of the average ρ(O 3 ) was calculated to be 47.5 µg/m 3 at 07:00. This phenomenon could be attributed to the promotion of O 3 generation under high temperature and intense radiation at noon, when the atmospheric photochemical reaction was accelerated [26]. However, before and after sunrise, solar radiation was relatively weak, and the increased ρ(NO 2 ) during the morning rush hour was beneficial for the consumption of O 3 through the reductive reaction.…”

Section: Daily Variation Of Air Pollutant Concentrationsmentioning

confidence: 99%

Spatiotemporal Assessment of Atmospheric Pollutants in Yancheng City, Eastern Coastal City of China

Wang

Zhang²,

et al. 2023

Atmosphere

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Atmospheric environmental pollution has become a critical issue in eastern coastal cities in China, so a broad understanding of its spatiotemporal characteristics is of importance to develop public policies. In this study, hourly data of ρ(PM2.5), ρ(PM10), ρ(NO2), ρ(SO2), ρ(O3) and φ(CO) of five different types of national air quality monitoring sites from 2016 to 2020 were analyzed, combined with the change of meteorological elements in the same period in Yancheng, which was a rapidly developed eastern coastal city in China. The results indicated that the pollutant concentrations except for ρ(O3) was low in summer and high in winter, decreasing year by year from 2016 to 2020. The proportion of moderately and heavily contaminated days in the whole year was decreasing from 80 days in 2016 to 52 days in 2020, and the days with good quality increased from 284 days in 2016 to 311 days in 2020. ρ(O3) was the highest in spring and the lowest in winter, increasing slightly year by year. The variation of ρ(PM2.5), ρ(PM10), ρ(NO2), ρ(SO2) and φ(CO) showed a double-peak type, reaching the peak value at 8:00–10:00 and 20:00–22:00, corresponding to the early and evening rush hours. ρ(PM2.5), ρ(PM10) and φ(CO) on the weekend were higher than on weekdays, while an insignificant difference of ρ(NO2), ρ(O3) and ρ(SO2) was found between weekdays and the weekend. Wind direction played a key role in the variation of pollutant concentration in the Yancheng urban area, and the correlation analysis indicated that ρ(PM2.5) and ρ(PM10) were highly correlated to wind direction. Temperature was positively correlated to ρ(O3), while air pressure was significantly negatively correlated to ρ(O3). Relative humidity was negatively correlated to ρ(PM2.5), ρ(PM10), ρ(NO2), ρ(SO2) and φ(CO), while air pressure was positively correlated with these pollutants.

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Section: Daily Variation Of Air Pollutant Concentrationsmentioning

confidence: 99%

Spatiotemporal Assessment of Atmospheric Pollutants in Yancheng City, Eastern Coastal City of China

Wang

Zhang²,

et al. 2023

Atmosphere

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“…Glass compositions containing lithium tetraborate, Li 2 B 4 O 7 , have an effective atomic number (Z eff = 7.3) close to that of human tissue (Z eff = 7.4). This characteristic classifies it as a tissue-equivalent material [9][10][11][12] with potential application for radiation dosimetry.…”

Section: Introductionmentioning

confidence: 99%

Structural and thermoluminescence properties of lithium borate glass matrices under UV and beta radiation

Menezes,

Zanatta,

Bannwart

et al. 2024

Luminescence

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In the present work, glass samples in the (100 − x)B2O3–xLi2O binary system, with x varying from 30 to 50 mol%, were prepared using the conventional melting and moulding method, with the main objective of evaluating the thermoluminescence response when exposing these materials to ultraviolet (UV) radiation. Complementary analysis based on density, optical absorption on the UV–visible region (UV–vis absorbance), Fourier transform infrared spectroscopy on the medium region, X‐ray diffraction, and differential thermal analysis measurements were performed. Thermoluminescence measurements of vitreous samples showed glow curves with at least one peak with a maximum temperature of ~170°C after exposure to UV radiation in the temperature range 50–250°C. Samples were also exposed to beta radiation in the temperature range 25–275°C, also showing single peaks with a maximum temperature of ~150°C.

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New Glasses in the PbCl2–PbO–B2O3 System: Structure and Optical Properties

et al. 2023

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New oxychloride lead borate glasses in the xPbCl2–(50-0.5x)PbO–(50-0.5x)B2O3 system were synthesized with a maximum lead chloride content of 40 mol%. The characteristic temperatures and mechanical and optical properties were studied. The incorporation of lead chloride led to a significant expansion of the transparency range in the UV (up to 355 nm) and IR regions (up to 4710 nm). Decreases in the Vickers hardness, density, and glass transition temperature were the consequences of a change in the structure. The studied glasses are promising materials for photonics and IR optics. The structure of the PbCl2–PbO–B2O3 system was analyzed in detail using vibrational spectroscopy and X-ray diffraction.

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Thermoluminescence emission on lead oxychloroborate glasses under UV exposure

Cited by 3 publications

References 30 publications

Spatiotemporal Assessment of Atmospheric Pollutants in Yancheng City, Eastern Coastal City of China

Spatiotemporal Assessment of Atmospheric Pollutants in Yancheng City, Eastern Coastal City of China

Structural and thermoluminescence properties of lithium borate glass matrices under UV and beta radiation

New Glasses in the PbCl2–PbO–B2O3 System: Structure and Optical Properties

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