THE PREPARATION OF SIMPLIFIED MANUALS FOR SHIELDING ANALYSIS. SUPPLEMENT 1: 'IN AND DOWN' SCATTERING AND FINITE FIELDS OF CONTAMINATION
CONESCO WATERTOWN MA
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A study was undertaken to examine present and proposed methods of calculating the attenuation afforded in and down scattered radiation by a horizontal slab, and the effects of finite fields of contamination in order to recommend improvements and updating for OCD documents TR-20, Volumes 1 and 2, Shelter Design and Analysis. In this study we examined the assumptions used in computing the in and down attenuation factor, assessed their effect on the resulting attenuation factors, and compared the results with the latest available experimental data. Recommendations are provided as to best value factors and how they might be included in existing publications. The effects of finite fields of contamination were subjected to further analysis by directly comparing the existing method of calculation with results obtained using transmission coefficients calculated by the Monte Carlo method. This comparison, though complete only for above-ground locations, indicates that further study is required before the existing method of calculation can be relied upon.
- Nuclear Radiation Shielding, Protection and Safety