Absorption Corrections
Fundamentals of absorption corrections in neutron scattering, covering basic principles, Paalman-Pings method, and Monte Carlo simulation for data analysis and correction. This includes sample environment considerations, input parameters, and correction calculations to refine experimental results. Dive into the essentials of scattering angles, transmission measurements, and sample shapes for accurate data interpretation.
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Presentation Transcript
Absorption Corrections Spencer Howells 1 Basics 2 Paalman-Pings 3 Monte Carlo
Basics Scattering point Neutron paths in and out Transmission exp(-n*sigma*l) measured, calculated Input Shape flat plate, cylinder, annulus Sample parameters cross-sections & density Wavelength for both paths Scattering angles
Paalman-Pings Takes into account both sample and container As,s Ac,c As,sc Ac,sc scattering sample container sample container absorption sample container sample & container sample & container Correction is (sample container*Ac,sc/Ac,c)/As,sc Could extend to sample environment Sample volume divided up Input from diffraction, indirect with elastic, direct
Monte Carlo Scattering point generated at random Added beam size Only calculates As,s and Ac,c Applied as an approximation Awaiting version for P-P
