Suren Kandasamy Dissertation.pdf - University of Surrey
Suren Kandasamy Dissertation.pdf - University of Surrey
Suren Kandasamy Dissertation.pdf - University of Surrey
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Photo-fraction %M.Sc <strong>Dissertation</strong>4.6 Photo-fractionThe photo-fraction was calculated using Eq. 2.10. The number <strong>of</strong> photonsdepositing their total energy into the detector is the number <strong>of</strong> events under thephotopeak after removing the background. This data is measured automatically by theMCA‟s s<strong>of</strong>tware. The Table 4.7 give the photo-fraction ratio for LaCl 3 :Ce detector.Table 4.7 Measured photo-fraction <strong>of</strong> LaCl 3 :Ce detector at various – ray energiesSourceEnergy(keV)Photopeak countTotal countPhoto-fraction%Error±%152 Eu 121.78 314866 3009597 10.46 0.03152 Eu 244.70 50391 3009597 1.67 0.01152 Eu 344.27 147908 3009597 4.91 0.0322 Na 511.00 43988 219570 20.03 0.10137 Cs 661.67 826893 3055378 27.06 0.04152 Eu 778.96 74082 3009597 2.46 0.02152 Eu 964.00 51809 3009597 1.72 0.01152 Eu 1112.05 50494 3009597 1.68 0.0160 Co 1173.24 80628 905834 8.90 0.0422 Na 1274.50 7666 219570 3.49 0.0460 Co 1332.50 71604 905834 7.90 0.04152 Eu 1407.92 35347 3009597 1.17 0.01Using the values shown in Table 4.7 the graph <strong>of</strong> Photo-faction versus gamma rayenergy was plotted, as shown in Fig 4.9.25.0020.0015.0010.005.000.000.00 200.00 400.00 600.00 800.00 1000.00 1200.00 1400.00 1600.00Energy (keV)Figure 4.9 Photo-fraction as a function <strong>of</strong> peak energyK. <strong>Suren</strong> 28
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