A simple method for background determination in small angle scattering experiments

The coherent signal of Small Angle Scattering superimposes to a, flat background, which is given by incoherent scattering, by electronic noise and, sometimes, by radiation background around the instrument. In order to analyze the experimental data, the background level has to be taken into account and quite often theoretical estimations do not give values comparable to the experimental evidences. In this paper it is shown a new representation which allows in a simple way the background level determination; in particular, in a convenient plot, the experimental data are fitted by a straight line passing through the origin, the slope of which is equal to the fourth root of the background