Practical Aspects of SANS Experiments

Wignall, G. D.

doi:10.1002/9780470933886.ch10

Cited by 2 publications

(1 citation statement)

References 54 publications

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“…8 and Table 6, demonstrate that the true modelled size distribution including the smaller diameter particles is only returned accurately by maximum entropy fitting when the data extend to very high Q values of 0.90-1.10 Å −1 . (This is consistent with the nominal resolution limit for SANS of D = 2π/Q max , which derives from Bragg's law, λ = 2D sinθ, and the definition of the scattering vector, Q = 4π sinθ/λ [25].) However, it is evident that the contribution from the smaller particles to the overall fitted volume fraction and number density increases with increasing Q max .…”

Section: Effect Of "Unresolvable" (Sub-10 å Diameter) Features On Thesupporting

confidence: 85%

A sensitivity study using maximum entropy to interpret SANS data from the Ringhals Unit 3 NPP

Hyde

Boothby

Swan

et al. 2018

Journal of Nuclear Materials

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SANS experiments were performed on a high Ni weld surveillance sample from the Ringhals NPP and the Maximum Entropy method was applied to determine the most probable size distribution of irradiation-induced scattering features. The results were shown to be consistent with atom probe observations. The sensitivity of the data analyses with respect to constraints such as the limited experimentally available Q range was explored. The calculated volume fraction and the mean volume-weighted diameter of the precipitates were found to be relatively insensitive to Q max (the maximum scattering vector) greater than ∼0.40 Å −1. However, use of a lower Q max results in a shift of the size distribution to larger diameters and a reduced particle number density. Simulations demonstrated that the experimentally observed decrease in the A-ratio at higher Q values is consistent with the presence of vacancies or higher Mn contents in smaller features. Importantly, features which are experimentally unresolvable do not add to the apparent volume fraction of the features which are resolved.

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Section: Effect Of "Unresolvable" (Sub-10 å Diameter) Features On Thesupporting

confidence: 85%