Department of Aerospace and Ocean Engineering

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Browsing Department of Aerospace and Ocean Engineering by Author "Al-Sheikhly, M."

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    Dose rate effects in radiation-induced changes to phenyl-based polymeric scintillators
    Papageorgakis, C.; Al-Sheikhly, M.; Belloni, A.; Edberg, T. K.; Eno, S. C.; Feng, Yongbin; Jeng, Geng-Yuan; Kahn, Abraham; Lai, Yihui; McDonnell, T.; Mohammed, Ameer; Palmer, C.; Perez-Gokhale, Ruhi; Ricci-Tam, F.; Yang, Zishuo; Yao, Yao (Elsevier, 2022-11)
    Results on the effects of ionizing radiation on the signal produced by plastic scintillating rods manufactured by Eljen Technology company are presented for various matrix materials, dopant concentrations, fluors (EJ-200 and EJ-260), anti-oxidant concentrations, scintillator thickness, doses, and dose rates. The light output before and after irradiation is measured using an alpha source and a photomultiplier tube, and the light transmission by a spectrophotometer. Assuming an exponential decrease in the light output with dose, the change in light output is quantified using the exponential dose constant D. The D values are similar for primary and secondary doping concentrations of 1 and 2 times, and for antioxidant concentrations of 0, 1, and 2 times, the default manufacturer's concentration. The D value depends approximately linearly on the logarithm of the dose rate for dose rates between 2.2 Gy/h and 100 Gy/h for all materials. For EJ-200 polyvinyltoluene-based (PVT) scintillator, the dose constant is approximately linear in the logarithm of the dose rate up to 3900 Gy/h, while for polystyrene-based (PS) scintillator or for both materials with EJ-260 fluors, it remains constant or decreases (depending on doping concentration) above about 100 Gy/h. The results from rods of varying thickness and from the different fluors suggest damage to the initial light output is a larger effect than color center formation for scintillator thickness <= 1 cm. For the blue scintillator (EJ-200), the transmission measurements indicate damage to the fluors. We also find that while PVT is more resistant to radiation damage than PS at dose rates higher than about 100 Gy/h for EJ-200 fluors, they show similar damage at lower dose rates and for EJ-260 fluors.