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Rev Sci Instrum. 2018 Mar;89(3):033701. doi: 10.1063/1.5009702.

Feasibility evaluation of a neutron grating interferometer with an analyzer grating based on a structured scintillator.

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School of Mechanical Engineering, Pusan National University, Busan 46241, South Korea.
Neutron Science Center, Korea Atomic Energy Research Institute, Daejeon 34057, South Korea.
Neutron Physics Group, National Institute of Standards and Technology, Gaithersburg, Maryland 20899, USA.


We introduce an analyzer grating based on a structured scintillator fabricated by a gadolinium oxysulfide powder filling method for a symmetric Talbot-Lau neutron grating interferometer. This is an alternative way to analyze the Talbot self-image of a grating interferometer without using an absorption grating to block neutrons. Since the structured scintillator analyzer grating itself generates the signal for neutron detection, we do not need an additional scintillator screen as an absorption analyzer grating. We have developed and tested an analyzer grating based on a structured scintillator in our symmetric Talbot-Lau neutron grating interferometer to produce high fidelity absorption, differential phase, and dark-field contrast images. The acquired images have been compared to results of a grating interferometer utilizing a typical absorption analyzer grating with two commercial scintillation screens. The analyzer grating based on the structured scintillator enhances interference fringe visibility and shows a great potential for economical fabrication, compact system design, and so on. We report the performance of the analyzer grating based on a structured scintillator and evaluate its feasibility for the neutron grating interferometer.


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