EXPERIMENTAL DETERMINATION OF THE WALL-SCATTERED RADIATION FUNCTION G SUB S (OMEGA)
Summary of research rept.
TECHNICAL OPERATIONS INC BURLINGTON MA
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A significant portion of the dose rate in a structure exposed to a field or radioactivity can be due to radiation scattered by the walls into the sensitive volume. In the analysis of structures based on the methods of the Engineering Manual, the radiation scattered from the wall is represented by a function G sub s omega, where omega is the solid angle fraction subtended by the structure at the detector. This function was derived from Spencers data for air-scattered radiation and was assumed dependent only on omega i.e., walls subtending equal solid angles would scatter equal dose rate to the detector, regardless of their respective positions with respect to the source plane. These two assumptions required direct testing under experimental circumstances that would give unambiguous answers. These answers could then be compared directly with those given by the Engineering Manual method. Direct comparison of this with the experimental dose rate gave agreement within 20, except for the highest and lowest positions, in the thin-walled structure and in the lowest position in the thicker cylinders.
- Nuclear Radiation Shielding, Protection and Safety
- Civil Defense