Advances on inorganic scintillator-based optic fiber dosimeters

Ding, Lei; Wu, Qiong; Wang, Qun; Li, Yamei; Perks, Richard Marc; Zhao, Liang

doi:10.1186/s40658-020-00327-6

Cited by 25 publications

(16 citation statements)

References 96 publications

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“…28,29 The use of scintillating fibers for online dosimetry has been previously reported in different RT modalities. [30][31][32] They exhibit several advantages over common commercial devices, such as small size, ruggedness, ease of use or high dynamic range. Not only do they produce scintillation light, but also they guide the produced optical photons with negligible self -absorption.…”

Section: Introductionmentioning

confidence: 99%

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Technical note: Measurement of the bunch structure of a clinical proton beam using a SiPM coupled to a plastic scintillator with an optical fiber

et al. 2023

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Background: Recent proposals of high dose rate plans in protontherapy as well as very short proton bunches may pose problems to current beam monitor systems. There is an increasing demand for real-time proton beam monitoring with high temporal resolution, extended dynamic range and radiation hardness. Plastic scintillators coupled to optical fiber sensors have great potential in this context to become a practical solution towards clinical implementation. Purpose: In this work,we evaluate the capabilities of a very compact fast plastic scintillator with an optical fiber readout by a SiPM and electronics sensor which has been used to provide information on the time structure at the nanosecond level of a clinical proton beam. Materials and methods: A 3 × 3 × 3 mm 3 plastic scintillator (EJ-232Q Eljen Technology) coupled to a 3 × 3 mm 2 SiPM (MicroFJ-SMA-30035, Onsemi) has been characterized with a 70 MeV clinical proton beam accelerated in a Proteus One synchrocyclotron. The signal was read out by a high sampling rate oscilloscope (5 GS/s). By exposing the sensor directly to the proton beam, the time beam profile of individual spots was recorded. Results: Measurements of detector signal have been obtained with a time sampling period of 0.8 ns. Proton bunch period (16 ns), spot (10 µs) and interspot (1 ms) time structures could be observed in the time profile of the detector signal amplitude. From this, the RF frequency of the accelerator has been extracted, which is found to be 64 MHz. Conclusions: The proposed system was able to measure the fine time structure of a clinical proton accelerator online and with ns time resolution.

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Section: Introductionmentioning

confidence: 99%

“…The use of scintillating fibers for online dosimetry has been previously reported in different RT modalities 30–32 . They exhibit several advantages over common commercial devices, such as small size, ruggedness, ease of use or high dynamic range.…”

Section: Introductionmentioning

confidence: 99%

Technical note: Measurement of the bunch structure of a clinical proton beam using a SiPM coupled to a plastic scintillator with an optical fiber

et al. 2023

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“…Inorganic scintillators (ISs) have also attracted attention as detectors in FOD 10 . ISs are mainly alkali halide or oxide crystals, usually doped with different activators 11 .…”

Section: Introductionmentioning

confidence: 99%

Technical note: Angular dependence in fiber optic dosimetry using YVO₄:Eu³⁺

et al. 2023

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Background: Fiber optic dosimetry (FOD) has emerged as a useful technique that can be used in those cases when intracavitary, real time, high spatial resolution dose assessment is required. Among the several factors characterizing a dosimeter, angular response of FOD probes has to be assessed in order to consider possible clinical application. Purpose: The objective of this study was to characterize the angular response of a FOD probe based on a cylindrical shaped YVO 4 :Eu 3+ scintillator under irradiation with a 6 MV photon beam generated by a linear accelerator (LINAC). Methods: A FOD probe was irradiated inside a plastic phantom using a 6 MV LINAC photon beam at different azimuthal angles (0 • to 360 • ,15 • steps). Scintillation output was measured with a photomultiplier tube. Similar measurements were performed with a second FOD probe having an optical filter interposed between the scintillator and the fiber. Monte Carlo simulations using PENELOPE were carried out in order to interpret the observed results. Results: The FOD output was symmetrical with respect to the scintillator axis. For the unfiltered probe, the signal was maximum at rear incidence (0 • ) and steadily decreased down to its minimum value at frontal incidence (180 • ) having a signal ratio of 37%. The output of the filtered probe showed a plateau from 15 • up to 115 • . The signal was maximum at 60 • and minimum at 180 • having a signal ratio of 16%. Monte Carlo simulations predicted symmetry of the deposited dose about 0 • and 90 • ,which contrasts with experimental findings. Conclusions: Photoluminescence (PL) of the scintillator induced by the Cherenkov light increases the angular dependence.Radiation attenuation inside the scintillator and partial light collection of the scintillation yield by the optical fiber (OF) are responsible for asymmetrical response. Results from this study should be considered in order to minimize angular dependence in FOD.

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“…Although the Gas-filled detectors has good uniformities but there are many disadvantage points such as gas leakage, highly sensitive with temperature, expensive cost, etc. While the Solid-state detectors have the uniformities problem, but these types are low weight, cost-effective [1], [2].…”

Section: Introductionmentioning

confidence: 99%

Performance of CsI (Tl) photodiode with optic fiber wire for Gamma-rays and X-rays detection

Aim-O

Klinkhieo

Sophon

et al. 2022

J. Phys.: Conf. Ser.

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In this paper, we explored the feasibility study of using the optic fiber wire to be a light transmitter for crystal scintillation material in the radiation measurement. The high-density material; thallium doped cesium iodide CsI (Tl) are widely used as converters for Gamma-rays and X-rays into visible light. Optic fibers are applied in the various applications such nuclear facilities, future fusion installations, medical treatment and diagnostic premises etc. The major advantages to be considered in optic fibers for radiation detection because their characteristics such as: capacities to work under electromagnetic fields; possibility to carry the wavelength signals; small size and low mass including possibility to monitor parameters from the sites far away from the controller. In this work, the cylindrical crystal CsI (Tl) material was connected with the single-clad optic scintillating fiber which transmitted the light signal to photodiode. Gamma-rays and X-rays sources had been investigated the measurement. The optic scintillating fibers have a good response with Cs-137 gamma radiation source at 662 keV. X-ray radiation that was generated from the X-ray tube was determined with the different operating voltages. The obtained results show this device can measure the X-ray radiation with energy range from 39 to 309 keV. CsI (TI) photodiode detector with optic fiber wire can be applied to measure gamma radiation and X-ray radiation as well as being able to the further work in the nuclear and radiation fields.

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Advances on inorganic scintillator-based optic fiber dosimeters

Cited by 25 publications

References 96 publications

Technical note: Measurement of the bunch structure of a clinical proton beam using a SiPM coupled to a plastic scintillator with an optical fiber

Technical note: Measurement of the bunch structure of a clinical proton beam using a SiPM coupled to a plastic scintillator with an optical fiber

Technical note: Angular dependence in fiber optic dosimetry using YVO₄:Eu³⁺

Performance of CsI (Tl) photodiode with optic fiber wire for Gamma-rays and X-rays detection

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Advances on inorganic scintillator-based optic fiber dosimeters

Cited by 25 publications

References 96 publications

Technical note: Measurement of the bunch structure of a clinical proton beam using a SiPM coupled to a plastic scintillator with an optical fiber

Technical note: Measurement of the bunch structure of a clinical proton beam using a SiPM coupled to a plastic scintillator with an optical fiber

Technical note: Angular dependence in fiber optic dosimetry using YVO4:Eu3+

Performance of CsI (Tl) photodiode with optic fiber wire for Gamma-rays and X-rays detection

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Technical note: Angular dependence in fiber optic dosimetry using YVO₄:Eu³⁺