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Figure 4
Measured effective scattering cross section from air in the detector vessel. Air with a pressure of P = 260 Pa was measured at a detector distance L2 = 15 m (green square symbols). An additional measurement was made with an air pressure of P = 3900 Pa and at a detector distance L2 = 5.5 m (blue circle symbols). Both data sets were reduced with a sample thickness dS = 0.1 cm. The solid lines are calculated with a correction factor obtained from equation (11)[link] with the beamstop located a distance Lbs = 26 cm in front of the detector. The dashed curves have the beamstop moved to the detection plane Lbs = 0 cm, thus removing the shadow of the beamstop.

Journal logoJOURNAL OF
APPLIED
CRYSTALLOGRAPHY
ISSN: 1600-5767
Volume 48| Part 4| August 2015| Pages 1055-1071
https://doi.org/10.1107/S1600576715010729
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