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Title: Fabrication and characterization of the source grating for visibility improvement of neutron phase imaging with gratings

Abstract

The fabrication of gratings including metal deposition processes for highly neutron absorbing lines is a critical issue to achieve a good visibility of the grating-based phase imaging system. The source grating for a neutron Talbot-Lau interferometer is an array of Gadolinium (Gd) structures that are generally made by sputtering, photo-lithography, and chemical wet etching. However, it is very challenging to fabricate a Gd structure with sufficient neutron attenuation of approximately more than 20 {mu}m using a conventional metal deposition method because of the slow Gd deposition rate, film stress, high material cost, and so on. In this article, we fabricated the source gratings for neutron Talbot-Lau interferometers by filling the silicon structure with Gadox particles. The new fabrication method allowed us a very stable and efficient way to achieve a much higher Gadox filled structure than a Gd film structure, and is even more suitable for thermal polychromatic neutrons, which are more difficult to stop than cold neutrons. The newly fabricated source gratings were tested at the polychromatic thermal neutron grating interferometer system of HANARO at the Korea Atomic Energy Research Institute, and the visibilities and images from the neutron phase imaging system with the new source gratings were comparedmore » with those fabricated by a Gd deposition method.« less

Authors:
 [1]; ; ;  [1];  [2];  [3];  [4]
  1. Neutron Science Division, Korea Atomic Energy Research Institute, Daejeon 305-353 (Korea, Republic of)
  2. Nano Fusion Technology Division, National Nanofab Center, Daejeon 305-701 (Korea, Republic of)
  3. Nuclear and Quantum Engineering Department, Korea Advanced Institute of Science and Technology, Daejeon 305-701 (Korea, Republic of)
  4. School of Mechanical Engineering, Pusan National University, Pusan 609-735 (Korea, Republic of)
Publication Date:
OSTI Identifier:
22118652
Resource Type:
Journal Article
Journal Name:
Review of Scientific Instruments
Additional Journal Information:
Journal Volume: 84; Journal Issue: 6; Other Information: (c) 2013 AIP Publishing LLC; Country of input: International Atomic Energy Agency (IAEA); Journal ID: ISSN 0034-6748
Country of Publication:
United States
Language:
English
Subject:
36 MATERIALS SCIENCE; 46 INSTRUMENTATION RELATED TO NUCLEAR SCIENCE AND TECHNOLOGY; 71 CLASSICAL AND QUANTUM MECHANICS, GENERAL PHYSICS; COLD NEUTRONS; DEPOSITION; DIFFRACTION GRATINGS; FABRICATION; FILMS; GADOLINIUM; GRATINGS; HANARO REACTOR; INTERFEROMETERS; INTERFEROMETRY; KAERI; PARTICLES; SPUTTERING; THERMAL NEUTRONS; VISIBILITY

Citation Formats

Kim, Jongyul, Nuclear and Quantum Engineering Department, Korea Advanced Institute of Science and Technology, Daejeon 305-701, Lee, Kye Hong, Lim, Chang Hwy, Kim, Taejoo, Ahn, Chi Won, Cho, Gyuseong, and Lee, Seung Wook. Fabrication and characterization of the source grating for visibility improvement of neutron phase imaging with gratings. United States: N. p., 2013. Web. doi:10.1063/1.4810014.
Kim, Jongyul, Nuclear and Quantum Engineering Department, Korea Advanced Institute of Science and Technology, Daejeon 305-701, Lee, Kye Hong, Lim, Chang Hwy, Kim, Taejoo, Ahn, Chi Won, Cho, Gyuseong, & Lee, Seung Wook. Fabrication and characterization of the source grating for visibility improvement of neutron phase imaging with gratings. United States. https://doi.org/10.1063/1.4810014
Kim, Jongyul, Nuclear and Quantum Engineering Department, Korea Advanced Institute of Science and Technology, Daejeon 305-701, Lee, Kye Hong, Lim, Chang Hwy, Kim, Taejoo, Ahn, Chi Won, Cho, Gyuseong, and Lee, Seung Wook. 2013. "Fabrication and characterization of the source grating for visibility improvement of neutron phase imaging with gratings". United States. https://doi.org/10.1063/1.4810014.
@article{osti_22118652,
title = {Fabrication and characterization of the source grating for visibility improvement of neutron phase imaging with gratings},
author = {Kim, Jongyul and Nuclear and Quantum Engineering Department, Korea Advanced Institute of Science and Technology, Daejeon 305-701 and Lee, Kye Hong and Lim, Chang Hwy and Kim, Taejoo and Ahn, Chi Won and Cho, Gyuseong and Lee, Seung Wook},
abstractNote = {The fabrication of gratings including metal deposition processes for highly neutron absorbing lines is a critical issue to achieve a good visibility of the grating-based phase imaging system. The source grating for a neutron Talbot-Lau interferometer is an array of Gadolinium (Gd) structures that are generally made by sputtering, photo-lithography, and chemical wet etching. However, it is very challenging to fabricate a Gd structure with sufficient neutron attenuation of approximately more than 20 {mu}m using a conventional metal deposition method because of the slow Gd deposition rate, film stress, high material cost, and so on. In this article, we fabricated the source gratings for neutron Talbot-Lau interferometers by filling the silicon structure with Gadox particles. The new fabrication method allowed us a very stable and efficient way to achieve a much higher Gadox filled structure than a Gd film structure, and is even more suitable for thermal polychromatic neutrons, which are more difficult to stop than cold neutrons. The newly fabricated source gratings were tested at the polychromatic thermal neutron grating interferometer system of HANARO at the Korea Atomic Energy Research Institute, and the visibilities and images from the neutron phase imaging system with the new source gratings were compared with those fabricated by a Gd deposition method.},
doi = {10.1063/1.4810014},
url = {https://www.osti.gov/biblio/22118652}, journal = {Review of Scientific Instruments},
issn = {0034-6748},
number = 6,
volume = 84,
place = {United States},
year = {2013},
month = {6}
}