Suren Kandasamy Dissertation.pdf - University of Surrey

More documents

Recommendations

Info

Peak energy (keV)M.Sc Dissertation4.3 Energy calibration of MCABefore starting the experiment it was essential to calibrate the systems to findwhether it is linear or not. The system was calibrated using the spectrum collected fromthe 22 Na, 137 Cs and 60 Co standard sources with LaCl 3 :Ce(10%) detector. Each spectrumwas collected for 600 sec.Table 4.3 Energy calibration for the detectorSourcePeak Energy(keV)Channel No22 Na 511.00 135.46137 Cs 661.67 176.8160 Co 1173.24 313.6360 Co 1274.50 337.1822 Na 1332.50 356.17Using the values shown in Table 4.3 the MCA calibration graph was plotted, as shownin Fig 4.3.13501250y = 3.7479x + 1.528211501050950850750650550450120 160 200 240Peak Channel No280 320 360Figure 4.3 The MCA calibration graph of LaCl 3 :Ce(10%) gamma-ray detectorK. Suren 21
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
Page 1 and 2: Characterisation of novel detector:
Page 3 and 4: M.Sc DissertationTable of ContentsC
Page 5 and 6: M.Sc DissertationAbstractDelft and
Page 7 and 8: M.Sc DissertationThe most commonly
Page 9 and 10: M.Sc DissertationGas-filled Detecto
Page 11 and 12: M.Sc Dissertation(A)(B)Figure 2.1 S
Page 13 and 14: M.Sc DissertationA desirable featur
Page 15 and 16: M.Sc DissertationAbsolute total eff
Page 17 and 18: Counts per channelM.Sc Dissertation
Page 19 and 20: M.Sc Dissertation3.2 To get the opt
Page 21 and 22: M.Sc Dissertationoperated at - 1800
Page 23 and 24: Total number of net countsM.Sc Diss
Page 25: Energy Resolution (%)M.Sc Dissertat
Page 29 and 30: Number of counts128.78 keV244.70 ke
Page 31 and 32: M.Sc Dissertationenergies (approxim
Page 33 and 34: Photo-fraction %M.Sc Dissertation4.
Page 35 and 36: M.Sc DissertationFigure 4.10 shows
Page 38 and 39: M.Sc DissertationChapter 5Conclusio
Page 40 and 41: M.Sc Dissertation[10] Alan Owens, A
Page 42 and 43: M.Sc DissertationAppendix BDetector
Page 44 and 45: M.Sc DissertationAppendix CDecay ch
Page 46: No of CountsNumber of counts1274.5

Suren Kandasamy Dissertation.pdf - University of Surrey

You also want an ePaper? Increase the reach of your titles

Delete template?

Save as template?