Responses of Gafchromic EBT3 films with polypropylene barriers to UV radiation

Yu, K.N.; Chun, S.L.; Chan, Po Man (陳寶雯)

doi:10.1016/j.rinp.2017.06.006

Cited by 4 publications

(3 citation statements)

References 6 publications

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“…[ 1,10 ] Nevertheless, for many years these phases were detained within the compounds involving C/N as X elements. [ 11–19 ] Concentration was triggered to the MAX phase borides (B as X element) following the successful atomic layer deposition of boron on a variety of metal substrates. [ 20,21 ] Additionally, owing to the possible applications of 2D boron and borides in nanoelectronic devices, scientists have focused largely on the B‐containing compounds.…”

Section: Introductionmentioning

confidence: 99%

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High Pressure Study of New Type of MAX Phases: Hf₂AB₂ (A = In, Sn)

Rahman

Kholil

Khatun

et al. 2022

Physica Status Solidi (b)

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This study carries out density functional theory (DFT)‐based simulation in order to observe the effect of pressure (up to 120 GPa) on the various physical properties of boron (B) containing new MAX compounds Hf2InB2 and Hf2SnB2. Structural parameters in ambient conditions show excellent concordance with prior experimental and theoretical data. A decreasing trend of lattice parameters with pressure is observed. The stability of the phases under pressure is determined by calculating the elastic constant using the Born stability criteria, and is found stable within the studied pressure range. Pressure's effect on the various elastic moduli is considered, and a linear response with pressure is observed. The brittle/ductile behavior under pressure is investigated, and a brittle to ductile phase transition is found. An opposite trend of elastic moduli with pressure is observed for Vickers hardness. The nonlinear variation of Vickers hardness with pressure has been interpreted in terms of Pugh ratio and density of states (DOS). A decreasing trend of the anisotropic indices is observed for Hf2InB2, while an increasing trend is observed for Hf2SnB2. The electronic and optical properties are also significantly influenced by the pressure. The results obtained at zero GPa have been compared with previous results and show significant agreement.

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Section: Introductionmentioning

confidence: 99%

“…[1,10] Nevertheless, for many years these phases were detained within the compounds involving C/N as X elements. [11][12][13][14][15][16][17][18][19] Concentration was triggered to the MAX phase borides (B as X element) following the successful atomic layer deposition of boron on a variety of metal…”

mentioning

confidence: 99%

High Pressure Study of New Type of MAX Phases: Hf₂AB₂ (A = In, Sn)

Rahman

Kholil

Khatun

et al. 2022

Physica Status Solidi (b)

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“…The blue colored polymer is formed when the active component in the film is exposed to radiation [7]. The color changes of EBT3 films have been proven to be highly correlated with the absorbed UV exposure by the films [8][9][10][11][12][13][14][15][16][17]. For the color analysis of the film through the visible absorbance spectroscopy technique, researchers found that the wavelength in the red region of the spectrum has the highest absorption [17][18][19].…”

Section: Introductionmentioning

confidence: 99%

Spectroscopy and Light Emitting Diodes Based System in Characterizing External Beam Therapy 3 Films for Solar Ultraviolet Measurement

Shah

Omar

2019

Photonic Sens

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Gafchromic external beam therapy 3 (EBT3) film has widely been used in medical field applications. Principally, the EBT3 film's color gradually changes from light green to darker color under incremental exposures by ionizing or even non-ionizing ultraviolet (UV) radiation. Peak absorbance of the EBT3 film can be used to predict absorbed doses by the film. However, until today, related researches still rely on spectrometers for color analysis of EBT3 films. Hence, this paper presents a comparative analysis between results produced by the spectrometer and a much simpler light-emitting diode-photodiode based system in profiling the color changes of EBT3 films after exposure by solar UV radiation. This work has been conducted on a set of 50 EBT3 samples with incremental solar UV exposure (doses). The wavelength in the red region has the best sensitivity in profiling the color changes of EBT3 films for low solar UV exposure measurement. This study foresees the ability of blue wavelength to profile films with a large range of solar UV exposure. The LED (light emitting diode)-based optical system has produced comparable measurement accuracies to the spectrometer and thus, with a potential for replacing the need for a multipurpose spectroscopy system for simple measurement of light attenuation.

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