New model for explaining the over-response phenomenon in percentage of depth dose curve measured using inorganic scintillating materials for optical fiber radiation sensors

Qin, Zhuang; Xie, Tianci; Dai, Xinyu; Zhang, Bin; Ma, Yu; Khan, Ihsan Ullah; Zhang, Xu; Li, Haopeng; Yan, Yongji; Zhao, Wei; Li, Song; Chen, Ziyin; Zhang, Daxin; Xu, Jun; Hu, Xiaokang; Xing, Lina; Feng, Kun; Lewis, Elfed; Sun, Weimin

doi:10.1364/oe.27.023693

Cited by 10 publications

(11 citation statements)

References 33 publications

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“…The high Z eff results in an over-response of IOSFD with respect to water or water-equivalent material due to the secondary radiation of low energy. A recent study reported a new model investigating the overresponse phenomenon in PDD measurement with IOSFD [63]. The experiment verified that the influence of the energy effect and Cherenkov effect only contributed to a small part of PPD deviation from the IC measurement.…”

Section: Pdd Deviation From the Standard Ic Measurementmentioning

confidence: 79%

“…A more reasonable explanation, according to the research of Qin et al [63], is that the inorganic scintillators are more sensitive to photons with energies under 1 MeV. Due to multiple Compton scattering events during the photon transporting in water, the photon energy keeps decreasing with respect to the increasing water depth (i.e., softening of the photon spectrum).…”

Section: Iosfd For X-ray Rtdmentioning

confidence: 99%

“…The deviation increased as the field size increased. The magnitude of the deviation depends not only on the field size but also on the type of scintillator, the incident radiation beam profile, and the sub-surface depth [27,58,63,[82][83][84][85].…”

Section: Pdd Deviation From the Standard Ic Measurementmentioning

confidence: 99%

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Advances on inorganic scintillator-based optic fiber dosimeters

Ding

Wang³

et al. 2020

EJNMMI Phys

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This article presents a new perspective on the development of inorganic scintillator-based fiber dosimeters (IOSFDs) for medical radiotherapy dosimetry (RTD) focusing on real-time in vivo dosimetry. The scintillator-based optical fiber dosimeters (SFD) are compact, free of electromagnetic interference, radiation-resistant, and robust. They have shown great potential for real-time in vivo RTD. Compared with organic scintillators (OSs), inorganic scintillators (IOSs) have larger X-ray absorption and higher light output. Variable IOSs with maximum emission peaks in the red part of the spectrum offer convenient stem effect removal. This article outlines the main advantages and disadvantages of utilizing IOSs for SFD fabrication. IOSFDs with different configurations are presented, and their use for dosimetry in X-ray RT, brachytherapy (BT), proton therapy (PT), and boron neutron capture therapy (BNCT) is reviewed. Challenges including the percentage depth dose (PDD) deviation from the standard ion chamber (IC) measurement, the angular dependence, and the Cherenkov effect are discussed in detail; methods to overcome these problems are also presented.

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Section: Pdd Deviation From the Standard Ic Measurementmentioning

confidence: 79%

Section: Iosfd For X-ray Rtdmentioning

confidence: 99%

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Advances on inorganic scintillator-based optic fiber dosimeters

Ding

Wang³

et al. 2020

EJNMMI Phys

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“…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]. OFSs filled with Gd 2 O 2 S:Tb have proved to exhibit excellent response characteristics when exposed to radiation, including linearity with measured dose, dose rate and excellent signal-to-noise ratio [8,[19][20][21][22].…”

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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“…X-rays were originally used for medical imaging diagnostics and X-ray crystallography for monitoring free radiation, a harmful ray to the human body, and are of great significance in terms of daily life [1,2], medicine [3][4][5][6][7], industry [8,9], etc. In a variety of X-ray detectors, the ionization chamber (ion chamber) is the "golden standard" for radiation detection, but it can only measure in vitro, requires relatively high measurement conditions, and is rather costly [10,11]; a film dosimeter is wearable but very precise position control is required to obtain accurate and high-resolution results [12,13]; the semiconductor dosimeter is outstanding in portability and resolution, but it has poor radiation resistance and a corresponding shorter service life [14,15].…”

Section: Introductionmentioning

confidence: 99%

Dosimeter Based on YAG: Ce Phosphor via Sol-Gel Method for Online X-ray Radiation Monitoring

et al. 2021

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This paper focuses on the preparation of cerium-doped yttrium aluminum garnet (YAG: Ce) powder with several concentration gradients via the sol-gel method by detecting its structural characteristics via X-ray diffraction (XRD) patterns and scanning electron microscope (SEM) to verify the generation of a complete crystal phase and evenly distributed nanopowder. On this basis, the luminescence characteristics of Ce3+ are explored, the mechanism and model are discussed based on the spectra, and the ideal doping concentration was obtained by comparing the luminescence intensity along with the fluorescence quenching theory and fluorescence decay spectra of samples with different doping concentrations. Several radiation dosimeters based on YAG: Ce phosphors were made; the online radiation monitoring function was realized under the exposure of a standard X-ray source; the repeatability, accuracy, and sensitivity of the system were verified by experiments; and the factors affecting dosimeter response are discussed. This paper verifies the possibility of adhibiting YAG: Ce fluorescent powder for online X-ray monitoring, and lays the foundation for further research.

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New model for explaining the over-response phenomenon in percentage of depth dose curve measured using inorganic scintillating materials for optical fiber radiation sensors

Cited by 10 publications

References 33 publications

Advances on inorganic scintillator-based optic fiber dosimeters

Advances on inorganic scintillator-based optic fiber dosimeters

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

Dosimeter Based on YAG: Ce Phosphor via Sol-Gel Method for Online X-ray Radiation Monitoring

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