Ten surfaces were exposed to a variety of clean-room environments. Particle distributions were measured by a washing technique and BRDF curves were obtained. Correlations (and lack thereof) between the two sets of data are given.
Paul R. Spyak,
William L. Wolfe,
"Scattering From Contaminated Surfaces", Proc. SPIE 1165, Scatter from Optical Components, (2 January 1990); doi: 10.1117/12.962858; https://doi.org/10.1117/12.962858