Abstract
For the case of point isotropic source, the number and energy current build-up factors, number of collisions, energy current spectra of γ-rays transmitted through spherical and cylindrical shields, and angular distribution through spherical shields were obtained by Monte Carlo calculations. Radiation with energy of 1.25 and 0.662 MeV was assumed to be emitted from the center of an iron and a lead shield varying from 1 to 5 mean free paths in radius. The case histories of 2,000 photons for a spherical shield and 4,000 photons for a cylindrical shield were followed on the IBM 7070 digital computer. Further, a 60Co point isotropic source was placed at the center of a cylindrical plastic scintillator, and pulse height distribution caused by energy absorption was measured for comparison with the Monte Carlo values. The results obtained by the experiment showed good agreement with the results of the Monte Carlo calculation.
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