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    Measuring the Scintillation Decay Constant of Pen and PET with 120 GeV Proton Beam Excitation
    (Institute of Electrical and Electronics Engineers Inc., 2020) Wetzel J.W.; Tiras E.; Bilki B.; Koseyan O.; Bostan N.; Onel Y.
    We report the scintillation decay constants of polyethylene naphthalate (PEN) and polyethylene terephthalate (PET) determined by excitation of the plastic substrate with an accelerated beam of protons and resulting light yield measured as a function of time with a photomultiplier attached to an oscilloscope. The decay constant of PEN was found to be 35 ns and PET 7 ns. © 2020 IEEE
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    Performance Measurements of Optical Scintillating Fibers After Repeated Exposure to Radiation
    (Institute of Electrical and Electronics Engineers Inc., 2020) Wetzel J.W.; Tiras E.; Koseyan O.; Bostan N.; Bilki B.; Winn D.R.; Onel Y.
    We report the preliminary results from repeated irradiations of optical scintillating fibers exposed to gamma radiation. Optical fibers degrade in radiation fields, but exhibit some recovery once removed. Study of repeated irradiations are difficult to find in the literature. We find that a UV-blue optical wavelength shifting fiber exhibits permanent degradation, the recovery is incomplete, and an interesting two step damage process that appears to affect which wavelengths are darkened at different rates. © 2020 IEEE
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    Radiation Damage and Recovery Mechanisms of Various Scintillators and Fibers
    (Institute of Electrical and Electronics Engineers Inc., 2021) Wetzel J.W.; Bilki B.; Bostan N.; Koseyan O.K.; Onel Y.; Tiras E.; Winn D.
    As the intensity frontier in high energy physics increases, new materials, tools, and techniques must be developed in order to accommodate the prolonged exposure of detectors to high amounts of radiation. It has been observed recently that many of the active media of detectors could survive to much lower radiation doses than initially expected. In addition to the challenges introduced by extremely high doses of radiation, there is also a significant lack of in-situ radiation damage recovery systems. In recent studies, we investigated the radiation damage to common plastic scintillators such as polyethylene naphthalate, and polyethylene terephthalate, a custom made elastomer based plastic scintillator, various special glasses and scintillating fibers together with their recovery mechanisms. Here we report on the irradiation studies and the investigation of the recovery mechanisms under various conditions. © 2021 IEEE.
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    Results from in Situ Monitoring of Radiation Damage of Scintillation Fibers
    (Institute of Electrical and Electronics Engineers Inc., 2020) Wetzel J.W.; Tiras E.; Koseyan O.; Bostan N.; Bilki B.; Winn D.R.; Onel Y.
    We report preliminary results from in situ monitoring of an optical scintillating fiber while being exposed to a cesium-173 gamma radiatior. We measured the degradation of fiber transmittance across the visible spectrum as a function of time. We observed that the region below 500 nm was degraded quickly and thoroughly while wavelengths above 500 nm lost clarity more slowly. © 2020 IEEE