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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M.Sc <strong>Dissertation</strong>Intrinsic photopeak efficiency,quanta <strong>of</strong> a specific energyformula:P, is defined as the percentage <strong>of</strong> radiationEthat are recorded and is expressed by the followingC PP 100%2.8N Where,C is the net number <strong>of</strong> counts in a photopeak corresponding to energy E ,pandN is the total number <strong>of</strong> quanta <strong>of</strong> energyEwhich fall on the detector crystal,given by:N DsI( E)2.94Where, I ( E ) is the fractional number <strong>of</strong> photons <strong>of</strong> energy Eemitted perdisintegration [7].2.4.4 Photo-fractionPhoto-fraction is defined as the ratio between the total number <strong>of</strong> photons under aphotopeak to the total number <strong>of</strong> photons detected by the detector. In other words theperformance <strong>of</strong> the system is the peak-to-total ratio, also called the photo-fraction.Photo-fraction gives an estimation <strong>of</strong> the number <strong>of</strong> photons that deposit their totalenergy in the crystal as a comparison <strong>of</strong> the number <strong>of</strong> detected photons [8].Counts in the peakPhot<strong>of</strong>ract ion 2.10Total number <strong>of</strong> CountsK. <strong>Suren</strong> 11
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