Evaluation of silica and PMMA optical fibre response when irradiated with 16.5 MeV protons

Asp, Johan; Santos, Alexandre; Afshar, V Shahraam; Zhang, Wen Qi; Bezak, Eva

doi:10.1016/j.ejmp.2019.08.001

Cited by 6 publications

(3 citation statements)

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“…20 Therefore, in future work, we aim to perform measurements of the energy spectrum of the proton beam exiting the beam port, using a novel fiber optic dosimetry system currently under development. 21 This system will also be used to measure two-dimensional (2D) beam profiles. At the current dose rates, irradiation times of a few seconds are required only to deliver standard radiotherapy doses (e.g.…”

Section: Discussionmentioning

confidence: 99%

“…It has however been shown that EBT3 films show an under response to doses at proton energies lower than 15 MeV . Therefore, in future work, we aim to perform measurements of the energy spectrum of the proton beam exiting the beam port, using a novel fiber optic dosimetry system currently under development . This system will also be used to measure two‐dimensional (2D) beam profiles.…”

Section: Discussionmentioning

confidence: 99%

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Design and verification of an external radiobiological beam port on a 16.5 MeV GE PETtrace proton cyclotron

et al. 2019

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Purpose Protons and heavy ions are considered to be ideal particles for use in external beam radiotherapy due to the superior properties of the dose distribution. While a photon (x‐ray) beam delivers considerable dose to healthy tissues around the tumor, a proton beam that is delivered with sufficient energies has: a low entrance dose (the dose in front of the tumor); a high‐dose region within the tumor, known as the Bragg peak; and, no exit dose beyond the tumor. Proton therapy is the next major step in advancing radiotherapy treatment. The purpose of this project was to adapt an existing radioisotope production cyclotron, a General Electric (GE) PETtrace, to enable radiobiological studies using proton beams. During routine use the PETtrace delivers 16.5 MeV protons to target with beam currents in the range of 10–100 µA resulting in dose rates in the order of kGy/s. To achieve the aim of the project the dose rate had to be reduced to the Gy/min range, without attenuating the proton energy below 5 MeV. This paper covers the design, construction and validation of the beam port. Methods Monte Carlo simulations were performed, using GEANT4, SRIM and PACE4 to design the beam port and optimize its components. Once the beam port was fabricated, validation experiments were performed using EBT3 and HD‐V2 Gafchromic™ films, and a Keithley 6485 picoampere meter. Results and conclusion The external beam port was successfully modeled, designed and fabricated. By using a 0.25 mm thick gold foil and a brass pin‐hole collimator the beam was spread from a narrow full beam diameter of 10 mm to a wide beam with a 5% flatness area in the center of the beam that had a diameter of ~20 mm. In using this system the dose rate was reduced from kGy/s to ~30 Gy/min.

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Section: Discussionmentioning

confidence: 99%

Section: Discussionmentioning

confidence: 99%

Design and verification of an external radiobiological beam port on a 16.5 MeV GE PETtrace proton cyclotron

et al. 2019

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“…The commercial range of these fibres is extensive in terms of material composition and, in particular, the availability of plastic optical fibres with diameters ranging from hundreds of µm to tens of mm. Their principal disadvantage is higher attenuation than silica fibres [ 10 , 12 , 13 , 14 ].…”

Section: Introductionmentioning

confidence: 99%

Design and Characterisation of an Optical Fibre Dosimeter Based on Silica Optical Fibre and Scintillation Crystal

Jelínek

Lazar

Mikel

2022

Sensors

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In nuclear power plants, particle accelerators, and other nuclear facilities, measuring the level of ionising gamma radiation is critical for the safety and management of the operation and the environment’s protection. However, in many cases, it is impossible to monitor ionising radiation directly at the required location continuously. This is typically either due to the lack of space to accommodate the entire dosimeter or in environments with high ionising radiation activity, electromagnetic radiation, and temperature, which significantly shorten electronics’ lifetime. To allow for radiation measurement in such scenarios, we designed a fibre optic dosimeter that introduces an optical fibre link to deliver the scintillation radiation between the ionising radiation sensor and the detectors. The sensors can thus be placed in space-constrained and electronically hostile locations. We used silica optical fibres that withstand high radiation doses, high temperatures, and electromagnetic interference. We use a single photon counter and a photomultiplier to detect the transmitted scintillation radiation. We have shown that selected optical fibres, combined with different scintillation materials, are suitable for measuring gamma radiation levels in hundreds of kBq. We present the architecture of the dosimeter and its experimental characterisation with several combinations of optical fibres, detectors, and scintillation crystals.

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Time dependence of silica optical properties during the implantation of fast hydrogen ions: Computer modeling

Barannik

Bainaiev

Zhurenko

et al. 2020

Nuclear Instruments and Methods in Physics Research Section B:

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Evaluation of silica and PMMA optical fibre response when irradiated with 16.5 MeV protons

Cited by 6 publications

References 14 publications

Design and verification of an external radiobiological beam port on a 16.5 MeV GE PETtrace proton cyclotron

Design and verification of an external radiobiological beam port on a 16.5 MeV GE PETtrace proton cyclotron

Design and Characterisation of an Optical Fibre Dosimeter Based on Silica Optical Fibre and Scintillation Crystal

Time dependence of silica optical properties during the implantation of fast hydrogen ions: Computer modeling

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Evaluation of silica and PMMA optical fibre response when irradiated with 16.5 MeV protons

Cited by 6 publications

References 14 publications

Design and verification of an external radiobiological beam port on a 16.5 MeV GE PETtrace proton cyclotron

Design and verification of an external radiobiological beam port on a 16.5 MeV GE PETtrace proton cyclotron

Design and Characterisation of an Optical Fibre Dosimeter Based on Silica Optical Fibre and Scintillation Crystal

Time dependence of silica optical properties during the implantation of fast hydrogen ions: Computer modeling

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Evaluation of silica and PMMA optical fibre response when irradiated with 16.5 MeV protons