RADIATION DISTRIBUTION WITHIN A MULTISTORY STRUCTURE.
Final rept. Sep 64-Dec 66,
CONESCO WATERTOWN MASS
Pagination or Media Count:
The report describes a series of experiments designed to measure the attenuated radiation dose within a structure from both an infinite field of contamination and limited strips of contamination. The experimental results are compared with results calculated on the basis of existing theories. In the infinite field studies, the experiments were conducted on a structure having 49, 98, and 147 psf walls, but no floors. These experiments were designed to determine the dose distribution with different wall mass thickness. In the following series the structure was modified by adding floors of 48.6 psf and 97.2 psf with 49 and 98 psf walls. In this series, the effect of floors on the dose distribution was studied. Both structure center line and off center measurements were taken. Relatively good agreement, generally within 25, was obtained between measured and computed reduction factors. In the limited strip studies, the same floor and wall combinations were used. The agreement between calculational and experimental dose rates for limited strips of contamination is good for a simple box type structure however, on upper stories of multi-story structures large differences were noted, especially for close in contamination. This difference is attributed partly to the scattered radiation emerging from the walls, which is assumed in the calculations to be symmetrical about the detector with respect to the horizon and unchanged with field widths. Experimental results indicated that the scattered radiation emerging from the walls is not symmetrical, but is more peaked in the upward direction. Author
- Nuclear Radiation Shielding, Protection and Safety