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- W2085678703 abstract "The study and the optimalisation of scintillation counters consisting of R1668 (R1398 with quartz window) photomultipliers and BaF2 crystals were carried-out in order to construct a 96 counter ring for time-of-flight positron tomography. The photoelectron yield measured for CsF and BaF2 crystals permitted us to estimate the photoelectron collection efficiency at different light wavelengths for R1668 photomultiplier in relation to the XP2020Q. This experiment, and the time resolution study, showed that at present the ability of R1668 photomultiplier for timing with BaF2 crystals is limited by a poor collection of photoelectrons produced by UV light. It was shown that a certain modification of the voltage between D1 and D2 dynodes improves the time resolution by 10%. A comparison of BaF2 crystals of different shapes showed that pyramidal cut crystal with a small opening angle equal to 1° ensures both a high detection efficiency and a good time resolution for 511 keV γ-rays. The best time resolution equal to 330 ps and the typical one equal to 350 ps were achieved with two counters for time-of-flight positron tomography." @default.
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- W2085678703 date "1984-10-01" @default.
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- W2085678703 title "Further study of scintillation counters with BaF2 crystals for time-of-flight positron tomography in medicine" @default.
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- W2085678703 doi "https://doi.org/10.1016/0168-9002(84)90076-7" @default.
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