The Attenuation of Gamma Rays at Oblique Incidence

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Abstract
The high cost and the heavy weight of barriers required for protection against high-energy roentgen or gamma rays warrant a detailed study of the factors involved in obtaining an economical solution to the protection problem. One factor which has had no detailed experimental or theoretical evaluation is the attenuation of radiation obliquely incident upon radiation barriers. It is usually assumed (1) that radiation obliquely incident on a barrier is attenuated to the same extent as it would be when normally incident on a barrier whose thickness is equal to the slant distance through the oblique barrier. This assumption, however, may lead to a significant underestimate of the barrier thickness required to produce a specified attenuation. In most protection problems, scattered radiation makes an important contribution to the transmission of the barrier (2). When radiation is normally incident, the scattered radiation which emerges from the barrier must always travel a distance greater than that traveled by ...
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