Refraction contrast imaging and edge effects in neutron radiography

This paper reports on the edge enhancement and refraction/scattering effects in neutron radiography measured at thermal and cold neutron beams with a high resolution ( similar to 55 mu m) microchannel plate neutron counting detector. These effects in some cases can enhance the contrast of certain fe...

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Bibliographic Details
Published inJournal of instrumentation Vol. 7; no. 2; p. C02047
Main Authors Tremsin, A S, Lehmann, E H, Kardjilov, N, Strobl, M, Manke, I, McPhate, J B, Vallerga, J V, Siegmund, O H W, Feller, W B
Format Journal Article
LanguageEnglish
Published 01.02.2012
Subjects
Beams (radiation)
Collimators
Detectors
Imaging
Neutron radiography
Reconstruction
Refraction
Scattering
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Summary:This paper reports on the edge enhancement and refraction/scattering effects in neutron radiography measured at thermal and cold neutron beams with a high resolution ( similar to 55 mu m) microchannel plate neutron counting detector. These effects in some cases can enhance the contrast of certain features in the neutron radiographic images. At the same time, the edge effects introduce image distortions, as in case of tomographic reconstructions. The edge effects in radiographies of several steel and aluminum objects are shown for different beam divergences and sample orientations relative to the beam. It is also demonstrated how novel microcapillary neutron collimators can enable refraction and scattering contrast imaging in some cases, where the refraction and scattering angles are relatively large. These collimators can also be used to reduce some refraction artifacts, namely remove bright edges in the transmission images.
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ISSN:1748-0221
1748-0221
DOI:10.1088/1748-0221/7/02/C02047