Suren Kandasamy Dissertation.pdf - University of Surrey

M.Sc Dissertation3.2 To get the optimum shaping timeThe apparatus was setup as shown in Fig. 3.1. Then the positive high voltagepower supply was set to 950 Volts from the above experiment. After that shaping timeof the Amplifier was set to 0.5 s and the corresponding spectrum of the 137 Cs sourcewas collected in the computer. Then the previous step was repeated for differentshaping time as 1.0 s, 2.0 s, 3.0 s, 6.0 s and 10.0 s. Finally the FWHM was noteddown for each spectrum and then energy resolution was calculated for thecorresponding shaping time. Then the graph of energy resolution versus shaping timewas plotted.3.3 Energy calibration of the LaCl 3 :Ce detectorThe basic experiment apparatus setup was arranged as shown in Figure usingLaCl 3 :Ce detector. First 137 Cs (662 keV) source was used and the correspondingspectrum was collected in the computer. Then the 137Cs (662 keV) source was replacedas 60 Co (1173 keV, 1274 keV) and 22 Na (511 keV, 1332 keV) and in each step peakcentroid channel number was recorded from the corresponding spectrum. Then the fullpeak energy versus channel number graph was plotted.3.4 Energy resolution137 Cs (662 keV), 60 Co (1173 keV, 1274 keV), 22 Na (511 keV, 1332 keV) and 152 Eu(121.78 keV, 244.70 keV, 344.27 keV, 778.96 keV, 964.00 keV, 1112.05 keV, 1407.92keV) sources were used in the above experiment setup and the spectrum was collectedfor each sources. FWHM values were noted for each peak from the correspondingspectrum. Then the energy resolution was calculated for each FWHM values. Finallythe energy resolution versus peak energy graph was plotted.K. Suren 14