Abstract
Pulses from bare photomultipliers, irridiated by γ-rays, are attributed to Cherenkov radiation, induced by Compton electrons. Due to this effect certain time spectra of delayed coincidences, measured with scintillators mounted on photomultipliers, consist of two components. Additional to the normal spectrum a weak spectrum, shifted with respect to the first one, is observed. This spectrum consists of delayed coincidences between the pulse due to a γ-rays detected in a scintillator and the pulse due to the other γ-ray, which was detected by the Cherenkov effect in the window of the photomultiplier. A possible systematic error in lifetime measurements, caused by this effect, is indicated, and a method to discriminate against this component in the time spectrum is described. The time resolution obtainable, using this Cherenkov radiation, is discussed.
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