Accounting for self-absorption in calculation of light collection in plastic scintillators

Senchyshyn, V.; Lebedev, V.N.; Adadurov, A.F.; Budagov, J.; Чириков-Зорин, И.

doi:10.1016/j.nima.2006.06.037

Cited by 14 publications

(10 citation statements)

References 7 publications

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“…shows comparison of simulated and experimental distributions of number of photoelectrons for three exemplary positions. A good agreement was obtained when scaling the absorption length of pure polystyrene[18] by factor of 0.55(Fig. 2).…”

supporting

confidence: 62%

Multiple Scattering and Accidental Coincidences in the J-PET Detector Simulated Using GATE Package

et al. 2015

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supporting

confidence: 62%

Multiple Scattering and Accidental Coincidences in the J-PET Detector Simulated Using GATE Package

et al. 2015

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“…(Thick line) The dependence of scintillator's absorption coefficient µ ef f on photon's wavelength. The effective coefficient µ ef f was determined by scaling the absorption coefficient of the pure polystyrene (Senchyshyn et al 2006) by factor of 1.8 (Kowalski et al 2015). (Thin line) Emission spectrum of the BC-420 plastic scintillator (Saint Gobain Crystals).…”

Section: Discussionmentioning

confidence: 99%

“…The latter, shown by thick solid line in Fig. 16, accounts effectively for the absorption of photons on the way to photomultipliers and was determined by scaling the absorption coefficient of pure polystyrene (Senchyshyn et al 2006) to the experimental results obtained with the single detection unit of the J-PET detector (Kowalski et al 2015). The scaling factor accounts effectively for the absorption due to the primary and secondary admixture in the scintillator material, imperfections of surfaces and reflectivity of the foil (Kowalski et al 2015).…”

Section: Discussionmentioning

confidence: 99%

Time resolution of the plastic scintillator strips with matrix photomultiplier readout for J-PET tomograph

et al. 2016

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Abstract. Recent tests of a single module of the Jagiellonian Positron Emission Tomography system (J-PET) consisting of 30 cm long plastic scintillator strips have proven its applicability for the detection of annihilation quanta (0.511 MeV) with a coincidence resolving time (CRT) of 0.266 ns. The achieved resolution is almost by a factor of two better with respect to the current TOF-PET detectors and it can still be improved since, as it is shown in this article, the intrinsic limit of time resolution for the determination of time of the interaction of 0.511 MeV gamma quanta in plastic scintillators is much lower. As the major point of the article, a method allowing to record timestamps of several photons, at two ends of the scintillator strip, by means of matrix of silicon photomultipliers (SiPM) is introduced. As a result of simulations, conducted with the number of SiPM varying from 4 to 42, it is shown that the improvement of timing resolution saturates with the growing number of photomultipliers, and that the 2 x 5 configuration at two ends allowing to read twenty timestamps, constitutes an optimal solution. The conducted simulations accounted for the emission time distribution, photon transport and absorption inside the scintillator, as well as quantum efficiency and transit time spread of photosensors, and were checked based on the experimental results. Application of the 2 x 5 matrix of SiPM allows for achieving the coincidence resolving time in positron emission tomography of ≈ 0.170 ns for 15 cm axial field-of-view (AFOV) and ≈ 0.365 ns for 100 cm AFOV. The results open perspectives for construction of a cost-effective TOF-PET scanner with significantly better TOF resolution and larger AFOV with respect to the current

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“…In Fig 6 emission spectra for the BC-420 and the J-PET scintillators are compared to the effective light absorption coefficient (blue dotted line) ( μ eff ) determined for the BC-420 scintillator strips with rectangular cross section of 7 mm x 19 mm [ 37 ]. It was established based on the absorption coefficient of pure polystyrene [ 38 ] and accounting for losses due to the transport of photons through the scintillator bar [ 37 ]. The decrease of the value of absorption coefficient with the growth of the wavelength indicates that the scintillation light for the J-PET scintillator will be less attenuated (with attenuation factor proportional to exp (− μ eff ) with respect to the BC-420 since the J-PET scintillator spectrum is extended toward higher wavelengths.…”

Section: Resultsmentioning

confidence: 99%

Novel scintillating material 2-(4-styrylphenyl)benzoxazole for the fully digital and MRI compatible J-PET tomograph based on plastic scintillators

et al. 2017

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A novel plastic scintillator is developed for the application in the digital positron emission tomography (PET). The novelty of the concept lies in application of the 2-(4-styrylphenyl)benzoxazole as a wavelength shifter. The substance has not been used as scintillator dopant before. A dopant shifts the scintillation spectrum towards longer wavelengths making it more suitable for applications in scintillators of long strips geometry and light detection with digital silicon photomultipliers. These features open perspectives for the construction of the cost-effective and MRI-compatible PET scanner with the large field of view. In this article we present the synthesis method and characterize performance of the elaborated scintillator by determining its light emission spectrum, light emission efficiency, rising and decay time of the scintillation pulses and resulting timing resolution when applied in the positron emission tomography. The optimal concentration of the novel wavelength shifter was established by maximizing the light output and it was found to be 0.05 ‰ for cuboidal scintillator with dimensions of 14 mm x 14 mm x 20 mm.

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Accounting for self-absorption in calculation of light collection in plastic scintillators

Cited by 14 publications

References 7 publications

Multiple Scattering and Accidental Coincidences in the J-PET Detector Simulated Using GATE Package

Multiple Scattering and Accidental Coincidences in the J-PET Detector Simulated Using GATE Package

Time resolution of the plastic scintillator strips with matrix photomultiplier readout for J-PET tomograph

Novel scintillating material 2-(4-styrylphenyl)benzoxazole for the fully digital and MRI compatible J-PET tomograph based on plastic scintillators

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