We introduce the concept of random diffusion-type field and study its homogeneity. In analyzing ergodic and quasiergodic fields, we establish the conditions necessary for the introduction of a physically small representative element of the body and the conditions of replacement of averaging over the ensemble by averaging over the body. The statistically homogeneous random diffusion-type fields are investigated and the effective radius of correlation is determined. The spectral expansions of random diffusion fields are presented and it is shown that the spectral amplitudes are delta-correlated in density for homogeneous random fields.
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