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Figure 8
Plot of parasitic background given as a scattering probability versus q from the BT5 USANS instrument (blue) and two different VSANS instrument configurations: (i) 12 CB (red) and (ii) NG = 0 pinhole collimation (black). Dashed lines are the expected diffraction from the corresponding sample apertures. The graph can be used to estimate the required scattering cross section of a sample needed to achieve a desired S/N ratio. For example, to have S/N = 1 at q = 0.001 Å−1, where the noise S(q) is ∼102 sr−1, would require for a dS = 0.1 cm-thick sample the macroscopic cross section dΣ/dΩ = S(q)/dS ≃ 1000 cm−1 sr−1 at q = 0.001 Å−1.

Journal logoJOURNAL OF
APPLIED
CRYSTALLOGRAPHY
ISSN: 1600-5767
Volume 55| Part 2| April 2022| Pages 271-283
https://doi.org/10.1107/S1600576722000826
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