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- W2073562671 abstract "The Monte Carlo electron-photon simulation package EGS3 has been used to calculate response functions for a wide variety of nuclear detectors. The detectors must be cylindrical and can be encased in a jacket or shielded by a plate of arbitrary material. The detector can have inert volumes. The code, via EGS, includes all physical processes necessary for accurate calculations for incident photons above 300 keV. An error in EGS concerning terminal processing of positrons has been found and corrected. The code runs 3 to 5 times faster than CYLTRAN. The paper presents benchmark comparisons between EGS and a wide variety of previous NaI and Ge(Li) response function calculations, in particular those of ETRAN where small but systematic differences were observed above 10 MeV incident energy. The effects of detector cladding and shielding have been studied. The program quantitatively explains the effects of a 1.18 g/cm2 Be beta absorber and qualitatively explains the 511 keV peak present for incident high energy photons. To first order it was found that only for the photopeak efficiencies can the effect of material in front of a detector be treated as a simple absorption. The reduction in the efficiency for counts within 1.5 MeV of the incident energy is considrably less than expected using only the cross section and the reduction for escape peaks is significantly more due to reflections of 511 keV photons back into the detector. Calculations of absolute Ge(Li) detector efficiency were found to be difficult due to sensitivity to inert layer parameters but relative efficiency curves were much less sensitive. Calculations are included of response functions for bismuth germanate and large NaI detectors and angular scans of Ge(Li) detectors for solid angle correction factors. Difficulties calculating electron response functions are discussed." @default.
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- W2073562671 date "1982-08-01" @default.
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- W2073562671 title "More realistic Monte Carlo calculations of photon detector response functions" @default.
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- W2073562671 doi "https://doi.org/10.1016/0167-5087(82)90155-7" @default.
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