Abstract
Experimental measurements have been made of the exposure due to 60Co and 137Cs gamma rays scattered from thick, semi-infinite slabs of concrete, lead and water, for various separation distances between source and detector and for various heights of source and detector above the scattering slabs. The results indicate that the ratio of source and detector height above the scattering slab to the distance of separation of source and detector is the parameter most influential in determining the scattered exposure. No influence on the scattered exposure was observed by positioning the source at a height greater or lesser than that of the detector. Isotropic reflection curves closely approximating the experimental points were obtained from albedo calculations and resulted in energy albedos of 0.00, 0.0113 and 0.049 for 60Co radiation on concrete, lead and water, respectively, and of 0.100, 0.013 and 0.083 for 137Cs radiation on concrete, lead and water, respectively.
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