Suren Kandasamy Dissertation.pdf - University of Surrey

Delay time (ps)Number of countM.Sc Dissertation40000y = 6.2101x + 759.5635000300002500020000150002400 2900 3400 3900 4400 4900 5400 5900 6400channel numberFigure 4.11 Time calibration graph of counting systemFrom the time calibration shows Fig. 4.11 the relation between channel and timeis linear (each channel has the same width of time in ps) and the slope of the linear is6 .2101 ps channel . Fig. 4.12 shows the counting spectrum of the BaF 2 scintillator.From the Fig. 15 the coinciding timing resolution of BaF 2 scintillator was measured tobe 384.3 ps (FWHM)30252015105059 59.2 59.4 59.6 59.8 60 60.2 60.4 60.6 60.8 61 61.2 61.4 61.6 61.8 62Time (ns)Figure 4.12 Coincidence timing resolution result for two BaF 2 -PMT detectors,one in start channel and one in stop channelK. Suren 31