Properties of plastic scintillators after irradiation

Zhao, Li; Chong, Wu; Yuekun, Heng; Xiaojian, Zhao; Shi, Feng; Sun, Zhi‐Wei; Wu, Jian; An, Zhu; Yuda, Zhao; Zhang, Ziping; Wang, Yifang

doi:10.1016/j.nima.2005.06.075

Cited by 15 publications

(9 citation statements)

References 8 publications

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“…The given linearity factor is likely to be of acceptable for many irradiations since PSDs have been shown to be robust toward scintillation deterioration. They experience only a small gradual decrease in light emission with accumulated dose 20,34 . Studies have shown that the relative response and quenching of plastic scintillators at these energies change substantially with small changes in photon energy 20–23 , and the intrinsic scintillation response of a specific PSD must therefore be comprehensively known.…”

Section: Discussionmentioning

confidence: 99%

“…They experience only a small gradual decrease in light emission with accumulated dose. 20,34 Studies have shown that the relative response and quenching of plastic scintillators at these energies change substantially with small changes in photon energy 20-23, and the intrinsic scintillation response of a specific PSD must therefore be comprehensively known. Therefore, this investigation used MC to score the relative dose to water and polystyrene to correct for the energy-dependent response of the scintillator, and the intrinsic energy dependence of the PSD was thus not investigated.…”

Section: MCmentioning

confidence: 99%

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Toward 3D dose verification of an electronic brachytherapy source with a plastic scintillation detector

et al. 2022

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Background: Electronic brachytherapy (eBT) is considered a safe treatment with good outcomes. However, eBT lacks standardized and independent dose verification, which could impede future use. Purpose: To validate the 3D dose-to-water distribution of an electronic brachytherapy (eBT) source using a small-volume plastic scintillation detector (PSD). Methods: The relative dose distribution of a Papillon 50 (P50) (Ariane Medical Systems, UK) eBT source was measured in water with a PSD consisting of a cylindrical scintillating BCF-12 fiber (length: 0.5 mm, Ø: 1 mm) coupled to a photodetector via an optical fiber. The measurements were performed with the PSD mounted on a motorized stage in a water phantom (MP3) (PTW, Germany). This allowed the sensitive volume of the PSD to be moved to predetermined positions relative to the P50 applicator, which pointed vertically downward while just breaching the water surface. The percentage depth-dose (PDD) was measured from 0 to 50 mm source-to-detector distance (SDD) in 1-3 mm steps. Dose profiles were measured along two perpendicular axes at five different SDDs with step sizes down to 0.5 mm. Characterization of the PSD consisted of determining the energy correction through Monte Carlo (MC) simulation and by measuring the stability and dose rate linearity using a well-type ionization chamber as a reference. The measured PDD and profiles were validated with corresponding MC simulations. Results:The measured and simulated PDD curves agreed within 2% (except at 0 mm and 43 mm depth) after the PSD measurements were corrected for energy dependency. The absorbed dose decreased by a factor of 2 at 7 mm depth and by a factor of 10 at 26 mm depth.The measured dose profiles showed dose gradients at the profile edges of more than 50%/mm at 5 mm depth and 15%/mm at 50 mm depth. The measured profile widths increased 0.66 mm per 1 mm depth, while the simulated profile widths increased 0.74 mm per 1 mm depth. An azimuthal dependency of > 10% was observed in the dose at 10 mm distance from the beam center. The total uncertainty of the measured relative dose is < 2.5% with a positional uncertainty of 0.4 mm. The measurements for a full 3D dose characterization (PDD and profiles) can be carried out within 8 h, the limiting factor being cooling of the P50. Conclusion:The PSD and MP3 water phantoms provided a method to independently verify the relative 3D dose distribution in water of an eBT source.

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Section: Discussionmentioning

confidence: 99%

Section: MCmentioning

confidence: 99%

Toward 3D dose verification of an electronic brachytherapy source with a plastic scintillation detector

et al. 2022

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“…A more complete description of the Time-Of-Flight system employed at BESIII, its design and arrangement can be found in the articles [1,4]. Since TOF usually operates in a radiation environment, the radiation damage, including light transmission, light output, excitation and emission spectra, of Bicron 408 and other two types of plastic scintillators had been experimentally studied [17] in the research and design stage of TOF system at BESIII. The performance of fine-mesh Hamamatsu R5924 PMT had also been investigated in a strong magnetic field up to 1T [18], and an exponential dependence of the relative gain on the working voltage was observed.…”

Section: The Barrel Time-of-flight Systemmentioning

confidence: 99%

A study of aging effects of barrel Time-Of-Flight system in the BESIII experiment

Liu,

Sun,

Fang

et al. 2017

Preprint

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The Time-Of-Flight system consisting of plastic scintillation counters plays an important role for particle identification in the BESIII experiment at the BEPCII double ring e + e − collider. Degradation of the detection efficiency of the barrel TOF system has been observed since the start of physical data taking and this effect has triggered intensive and systematic studies about aging effects of the detector. The aging rates of the attenuation lengths and relative gains are obtained based on the data acquired in past several years. This study is essential for ensuring an extended operation of the barrel TOF system in optimal conditions.

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“…4 Commercial plastic scintillators EJ-200 (Eljen Technology), BC-404 and BC-408 (Saint-Gobain Crystals and Detectors) were exposed to large irradiation doses from a 60 Co source (185 MBq) with a 3162 Gy/h dose rate. 5 Among the three materials, EJ-200 was concluded to have the best behavior. A substantial change of the photophysical response was observed for all samples at a radiation dose of 14.4 kGy.…”

Section: Introductionmentioning

confidence: 98%

Large irradiation doses can improve the fast neutron/gamma discriminating capability of plastic scintillators

Montbarbon¹,

Amiot

Tromson³

et al. 2017

Phys. Chem. Chem. Phys.

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When new materials appear as potential alternatives for radiation detection, several criteria have to be fulfilled. The one presented herein is the response variation to large irradiation doses of neutron/gamma discriminating plastic scintillators. Thus, several samples were exposed to high gamma doses reaching 10 kGy. They were characterized in terms of gamma spectrometry and fast neutron/gamma discrimination, prior to and after irradiation. Results show an unexpected increase of the figure of merit (FoM), which is the numerical value for n/γ discrimination performances. An in-depth investigation evaluates the physicochemical impact of such large doses within the material. The characterization includes photophysics, radiation/matter interaction and chemical analyses (EPR, H NMR, fluorescence spectroscopy and HRMS).

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Properties of plastic scintillators after irradiation

Cited by 15 publications

References 8 publications

Toward 3D dose verification of an electronic brachytherapy source with a plastic scintillation detector

Toward 3D dose verification of an electronic brachytherapy source with a plastic scintillation detector

A study of aging effects of barrel Time-Of-Flight system in the BESIII experiment

Large irradiation doses can improve the fast neutron/gamma discriminating capability of plastic scintillators

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