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Incoherent background can create an intrinsic problem for standard smallangle neutron scattering measurements. Biological samples contain hydrogenwhich is a strong incoherent scatterer thus creating an intrinsic source ofbackground that makes determination of the coherent scattering parametersdifficult in special situations. This can especially be true for the Q-rangefrom around 0.1-0.5 \AA^-1 where improper knowledge of the background level canlead to ambiguity in determination of the samples structure parameters.Polarization analysis is a way of removing this ambiguity by allowing one todistinguish the coherent from incoherent scattering, even when the coherentscattering is only a small fraction of the total scattered intensity. ^3He spinfilters are ideal for accomplishing this task because they permit the analysisof large area and large divergence scattered neutron beams without adding todetector background or changing the prorogation of the scattered neutron beam.This rapid note describes the application of ^3He neutron spin filters,polarized using the spin-exchange optical pumping method, for polarizationanalysis on a protein sample to unambiguously extract the coherent scatteredintensity.

Unambiguous determination of structure parameters for soft matter  samples made possible with polarization analysis on JCNS SANS using a 3He  spin filter