AN ANALYSIS OF THE PERFORMANCE OF ENCLOSURE SHIELDS IN A REAL FALLOUT FIELD.
RADIATION RESEARCH ASSOCIATES INC FORT WORTH TEX
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State-of-the-art shield calculational techniques were applied in the analysis of an experiment in which spherical and cubical multilayer iron and water enclosure shields were exposed in a real fallout field. The calculations were divided into three steps 1 specification of the time-depndent energy spectrum of the gamma rays emitted by the fallout, 2 determination of the energy and angular distribution of the resultant gamma rays incident upon the shields, and 3 calculation of the penetration of the gamma rays into the shields. A variety of theoretical and measured data were used for the fallout emission spectra. Monte Carlo air-and ground-scattering data along with a limited amount of measured data were employed in establishing the radiation distribution incident upon the shields. Monte Carlo procedures were used to compute the penetration into the shields. Results indicated that the shields were least efective during the first few hours and that the dose transmission factors decreased by as much as 50 percent by the end of the first day. Author
- Nuclear Radiation Shielding, Protection and Safety