An Optical Fiber Sensor Based on La2O2S:Eu Scintillator for Detecting Ultraviolet Radiation in Real-Time

Yan, Yongji; Zhang, Xu; Li, Haopeng; Ma, Yu; Xie, Tianci; Qin, Zhuang; Liu, Shuangqiang; Sun, Weimin; Lewis, Elfed

doi:10.3390/s18113754

Cited by 16 publications

(4 citation statements)

References 21 publications

(20 reference statements)

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“…These are all known to produce a thermographic response from laser excitation [8,29,30]. In addition, the phosphors Gd 2 O 2 S:Tb [27], La 2 O 2 S:Eu [31], and Y 2 SiO 5 :Ce [20] are commonly used as scintillators and are therefore expected to produce a visible response when excited via x-rays.…”

Section: Experimental Methodsmentioning

confidence: 99%

Visible emission spectra of thermographic phosphors under x-ray excitation

Westphal

Brown

Quintana

et al. 2021

Meas. Sci. Technol.

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Thermographic phosphors have been employed for temperature sensing in challenging environments, such as on surfaces or within solid samples exposed to dynamic heating, because of the high temporal and spatial resolution that can be achieved using this approach. Typically, UV light sources are employed to induce temperature-sensitive spectral responses from the phosphors. However, it would be beneficial to explore x-rays as an alternate excitation source to facilitate simultaneous x-ray imaging of material deformation and temperature of heated samples and to reduce UV absorption within solid samples being investigated. The phosphors BaMgAl10O17:Eu (BAM), Y2SiO5:Ce, YAG:Dy, La2O2S:Eu, ZnGa2O4:Mn, Mg3F2GeO4:Mn, Gd2O2S:Tb, and ZnO were excited in this study using incident synchrotron x-ray radiation. These materials were chosen to include conventional thermographic phosphors as well as x-ray scintillators (with crossover between these two categories). X-ray-induced thermographic behavior was explored through the measurement of visible spectral response with varying temperature. The incident x-rays were observed to excite the same electronic energy level transitions in these phosphors as UV excitation. Similar shifts in the spectral response of BAM, Y2SiO5:Ce, YAG:Dy, La2O2S:Eu, ZnGa2O4:Mn, Mg3F2GeO4:Mn, and Gd2O2S:Tb were observed when compared to their response to UV excitation found in literature. Some phosphors were observed to thermally quench in the temperature ranges tested here, while the response from others did not rise above background noise levels. This may be attributed to the increased probability of non-radiative energy release from these phosphors due to the high energy of the incident x-rays. These results indicate that x-rays can serve as a viable excitation source for phosphor thermometry.

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Section: Experimental Methodsmentioning

confidence: 99%

Visible emission spectra of thermographic phosphors under x-ray excitation

Westphal

Brown

Quintana

et al. 2021

Meas. Sci. Technol.

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“…The high energy particles induce the transition and depolarization of extra-nuclear electrons of the inorganic scintillator to excite visible-band fluorescence, and the resulting scintillating fluorescence is transmitted through an optical fiber towards a distal photodetector. This approach has also allowed OFS to be used for many other applications including ultraviolet detection [12] and radioprotection [13]. In the field of radiotherapy, OFS exhibit several advantages compared to existing commercial technologies including ionization chambers, in particular in terms of spatial resolution and potential in-vivo use [14][15][16][17][18].…”

Section: Introductionmentioning

confidence: 99%

Measurement of scattered rays from different materials using an inorganic scintillator based optical fiber sensor and its application in radiotherapy

Xie¹,

He²,

Shi³

et al. 2022

Biomed. Phys. Eng. Express

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Measurements using an Optical Fiber OFS including an inorganic scintillator placed on the surface of a phantom show that the particle energy distribution inside the phantom remains unchanged. The backscattered intensity measured using an Optical Fiber Sensor (OFS) exhibits a linear relationship with the total radiation dose delivered to the phantom, and this relationship shows that the OFS can be used for indirect dose measurement when located on the surface of the phantom i.e. that arising from the energetic backscattered electrons and photons. Such a device can therefore be used as a clinical in-vivo dosimeter, being located on the patient’s body surface. In addition, the measurement results for the same OFS located inside and outside the radiation field of a compound water based phantom are analyzed. The differences in measurement of the fluorescence signal in response to various tissue materials representing bone or tumor tissue in the irradiation field are strongly related to the material's ability to block the scattered rays from the water phantom, as well as the scattered X-rays generated by the material located within the phantom.

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“…They presented a UV sensor based on photochromic optical microfiber which enhances the sensitivity to 3.13 nW/cm2 compared to traditional electrical devices. A UV optical fiber sensor based on the scintillating material La2O2S: Eu was presented in 2018 [12]. These materials were very sensitive to UV light intensity even in presence of strong electromagnetic interference.…”

Section: Introductionmentioning

confidence: 99%

Real-time Ultraviolet Radiation Sensor Based on Modified Cladding Optical Fibers Technology

Muhammed¹,

Mahmood²,

Kadhim³

et al. 2021

eijs

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In this work, the performance of single-mode optical fibers (SMFs) for ultraviolet (UV) radiation monitoring and dosimetry applications is presented. In particular, this work will focus on the Radiation-Induced Absorption (RIA) phenomena in the Near-Infrared domain (NIR). Such phenomena play a very important role in the sensing mechanism for SMF. Single mode fibers with a diameter of 50 µm were used for this purpose. These fibers were dipped into germanium (Ge) solution with different concentrations (1, 3, and 5 wt%) to produce the sensing part of the sensor. For all optical fiber sensors under investigation, the results indicated the dependence of the RIA on the applied UV radiation energy. Also, a redshift in peak wavelength was obtained. The influence of Ge concentration on sensing efficiency was studied and the best results were obtained with 3 wt% concentration as compared to 1 wt % and 5 wt % concentrations. The presented sensor shows good sensitivity to UV radiation which makes it possible to be applied in medical applications.

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An Optical Fiber Sensor Based on La2O2S:Eu Scintillator for Detecting Ultraviolet Radiation in Real-Time

Cited by 16 publications

References 21 publications

Visible emission spectra of thermographic phosphors under x-ray excitation

Visible emission spectra of thermographic phosphors under x-ray excitation

Measurement of scattered rays from different materials using an inorganic scintillator based optical fiber sensor and its application in radiotherapy

Real-time Ultraviolet Radiation Sensor Based on Modified Cladding Optical Fibers Technology

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