The Variation of Scattered X-Rays with Density in an Irradiated Body

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Abstract
With a constant effective atomic number there is a general relationship between the variation of scatter with density and the variation with geometry of the system. A simplified analysis of the scatter contribution in water equivalent bodies is presented. Relative scatter absorption factors are defined and the values of these factors in water equivalent materials determined for radiation with a half-value layer of 1.5 mm Cu. Through the general relationship between density of the body and geometry of the system, values for relative scatter absorption factors in bodies of other than unit density are deduced and can be used to calculate the scatter dose delivered to points within an inhomogeneous body. The practical importance of the results obtained is discussed with particular reference to the use of Transit Dose techniques.

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