Suren Kandasamy Dissertation.pdf - University of Surrey

Number of countsM.Sc DissertationFrom the energy calibration, Fig. 4.3 shows the relation between channel andenergy is linear (each channel has the same width of energy) and mathematicallyrepresented by the equation isEnergy ( keV) 3.7479Channelnumber 1.52824.1The implication of this equation is that for any given channel on the MCA, byplugging that channel number into Eq. 4.1, the energy that the MCA channel representhas been calculated. After the energy calibration of the system, the spectrum of 137 Cs,60 Co and 152 Eu was collected by LaCl 3 :Ce (10%) detector to check the linearity ofLaCl 3 (10%) detector. The Fig 4.4, 4.5, 4.6 show the spectrum of 137 Cs, 60 Co and 152 Eurespectively. For each spectrum the x-axis was converted into energy in keV. It showsthe full energy peak of each sources was collected their actual energy position. Thatmeans the LaCl 3 :Ce detector was give good linear response to MCA wide range from32 keV to 1407 keV.18000016000014000032 keVKα X-ray peak662 keVFull energy peak120000100000800006000040000Backscatter peakComptoncontinuumCompton edge2000000 50 100 150 200 250 300 350 400 450 500 550 600 650 700 750 800Energy (keV)Figure 4.4 Pulse height spectrum for 662 keV gamma rays ( 137 Cs) taken with51 76mm LaCl 3 :Ce(10%) scintillator detectorFigure 4.4 represents the energy spectra of 662 keV gamma-rays from 137 Cssource, as collected with LaCl 3 :Ce(10%) detector with 1.0 s shaping time constant,acquired for 600 sec. For room temperature LaCl 3 :Ce(10%) detector have very goodK. Suren 22