# Absolute scattering cross-section

The **absolute scattering** is the scattering intensity given in correct absolute units (as opposed to relative unites); from this quantity one can make quantify certain values (amount of material, molecular weight, etc.).

The easiest way to obtain absolute scattering is to measure a known standard (glassy carbon, water, etc.). In small-angle scattering:

Where:

- I(q) is the scattering intensity, in arbitrary units
- I_0 is the apparent source intensity (incident beam), in arbitrary units
- is the solid angle subtended by detector
*t*is sample thickness- is the linear absorption coefficient
- is the differential scattering cross-section per unit volume per unit solid angle (units cm
^{−1</math>)}

## See Also

*J. Appl. Cryst.***1972**, 5, 315-324.*J. Appl. Cryst.***1983**, 16, 473-478.*Acta Metall. Mater.***1991**, 39, 11, 2477-2487.