Plastic scintillator investigations for relative dosimetry in proton-therapy

Torrisi, L.

doi:10.1016/s0168-583x(00)00237-8

Cited by 92 publications

(83 citation statements)

References 8 publications

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“…This is in agreement with the findings of Safai [19], Archambault et al [16], and Torrisi [17], but when taken by itself, the Čerenkov signal showed not only very good signal to noise ratio (between 40 and 60; increasing SNR with LET), but showed a superior peak-to-surface ratio as compared to the fullsignal detector or the Exradin W1 in the proton beam. Though this is not exactly in agreement with the work done by Jang et al [20], the study was not carried out with identical instruments or with the same thoroughness as the Jang study: RBP and SOBP were measured using coarse step sizes and were not repeated, and dose response was not studied.…”

Section: čErenkov Resultssupporting

confidence: 91%

“…Possible causes for over-response in these detectors could be due to geometry, damage to the detectors or other effects such as columnar recombination [7]. The quenching exhibited by the scintillators was not unexpected due to previous research done by Archambault et al [16], Torrisi [17], and others. Finally, a measure of uncertainty at the Bragg peak could also be attributed to the relatively large diameter of the detector (0.5 mm)-this is the large-diameter end for resolving the peak of a lower energy proton beam such as the 74 MeV beam used.…”

Section: Raw and Spread-out Bragg Peaksmentioning

confidence: 99%

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Characterization of a Terbium-Activated Gadolinium Oxysulfide Plastic Optical Fiber Sensor in Photons and Protons

et al. 2018

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Abstract-A characterization study was carried out to determine if a novel, millimetre sized Terbium-activated Gadolinium Oxysulfide optical fibre detector has potential for future use in proton dosimetry. Preliminary studies employed a Theratronics Theratron 780C Cobalt-60 unit and were used to determine nominal dose response, field size response and Čerenkov contributions in 1.25 MeV gamma radiation. Extensive testing was done using 74 MeV protons produced in the TRIUMF 500 MeV cyclotron facility examining raw Bragg peak, spread out Bragg peak, dose response and Čerenkov signal. The detector was low-cost and easily assembled; it showed excellent sensitivity, signal to noise ratio and reproducibility. Quenching at high LET was severe though found to be slightly less than in a commercial scintillating detector. Additional investigations are needed to further explore Čerenkov-only depth-dose curves, signal detection at the extreme distal end of the Bragg peak, and possible sensitivity to neutrons.

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Section: čErenkov Resultssupporting

confidence: 91%

Section: Raw and Spread-out Bragg Peaksmentioning

confidence: 99%

Characterization of a Terbium-Activated Gadolinium Oxysulfide Plastic Optical Fiber Sensor in Photons and Protons

et al. 2018

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“…The quenching phenomenon, which is the degradation of the luminescence efficiency in luminescence materials for high-LET particles, was reported by a number of researchers. (11)(12)(13) This phenomenon was also observed in our small-size dosimeter, and the level of quenching was varied among the phosphors. (14,15) The quenching effect is considered to be due to the temporal and local deficiencies of luminescence origins, such as trap centers in OSL materials.…”

Section: Introductionsupporting

confidence: 71%

Particle Dependence of Quenching Effect in an Optical-Fiber-Type Optically Stimulated Luminescence Dosimeter

Hirata

Watanabe

Yoshihashi

et al. 2017

Sensors and Materials

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To monitor an actual dose in a patient's body during radiotherapy treatment, we have developed a small-size dosimeter of an optical fiber probe mounting optically stimulated luminescence (OSL) materials at the tip. The OSL materials show a quenching effect when they are irradiated by charged particles with high linear energy transfer (LET). We evaluate the particle dependence on the quenching effect in the small-size OSL dosimeter probe. Eu:BaFBr and Ce:CaF 2 were adopted as OSL materials, and two types of small-size dosimeter were fabricated. We irradiated 290 MeV/u carbon ions, 150 MeV/u helium ions, and 225 MeV protons and measured the Bragg peak. The Eu:BaFBr small-size dosimeter showed the quenching effect in these three types of particle irradiation. The Ce:CaF 2 small-size dosimeter showed the quenching effect only in carbon ion irradiation. The luminescence efficiencies of Eu:BaFBr were compared among these three charged particles. The quenching effect of Eu:BaFBr is independent of the irradiated particles.

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“…where k B is the Birks' constant, which depends on the scintillating material (0.088 mm keV À1 for polyvinyltoluene-based scintillators, Torrisi, 2000). The integration of equation (18) gives:…”

Section: Non-linearity Of the Scintillator/convertermentioning

confidence: 99%

A telescope detection system for direct and high resolution spectrometry of intense neutron fields

Agosteo

Fazzi

Introini

et al. 2016

Radiation Measurements

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Plastic scintillator investigations for relative dosimetry in proton-therapy

Cited by 92 publications

References 8 publications

Characterization of a Terbium-Activated Gadolinium Oxysulfide Plastic Optical Fiber Sensor in Photons and Protons

Characterization of a Terbium-Activated Gadolinium Oxysulfide Plastic Optical Fiber Sensor in Photons and Protons

Particle Dependence of Quenching Effect in an Optical-Fiber-Type Optically Stimulated Luminescence Dosimeter

A telescope detection system for direct and high resolution spectrometry of intense neutron fields

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