Abstract
The capability of the HR 400 MCP photomultiplier to measure light pulse shaes from scintillators by means of the single photon method was studied. A time resolution of the timing system for single photoelectrons equal to 145 ps at fwhm and a time jitter of the HR 400 photomultiplier equal to 122 ps were measured by means of Cherenkov light produced in the photocathode glass window by γ-rays from a 60Co source. Both techniques of the single photon method, with a common scintillator and with separate ones, were tested during the study. Utilisation of the coincidence of the 625 keV K conversion electrons from a 137Cs source detected in the reference counter with the 31.6 keV K X-rays exciting the scintillator under study was proposed for the separate scintillator technique. This latter technique permits the measurement of light pulse shapes from encapsulated scintillator samples and particularly from black-coated ones to avoid the slowing-down of the light pulse by the light collection process. The application of the method to study light pulse shapes from fast organic scintillators and slow inorganic crystals was tested.
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