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The helium bubbles produced by annealing a homogeneously implanted specimen of a model ternary alloy (FeNiCr) at a high temperature are characterized by a size-dependent gas density. Hence, the contrast factor, which is given by the difference between the scattering-length density of the matrix and of the inhomogeneities, is not constant. A quantitative analysis of the small-angle neutron scattering data is performed taking into account a size-dependent contrast factor. The Guinier radii found from the experimental data agree with those predicted by the theory under the assumption of a non-constant factor.

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