It is shown that it is hardly possible to obtain Everhart's backscattering coefficient as a function of Z by considering only large angle single scatterings and fitting parametrically to experimental points, because backscattering receives large contributions from two-fold (and probably many-fold) collisions even at small atomic numbers. It is therefore suggested that in attempts to improve backscattering calculations a diffusion theory must have an advantage over single and many-fold scattering theories.
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Z.T. Bödy (1962) studied this question.
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