Experimental evaluation of neutron absorption grating fabricated by oblique evaporation of gadolinium for phase imaging

斜め蒸着法により製作された位相イメージング用中性子吸収格子の実験的評価

關 義親; 篠原 武尚   ; 上野 若菜; Parker, J. D.*; 佐本 哲雄*; 矢代 航*; 百生 敦*

Seki, Yoshichika; Shinohara, Takenao; Ueno, Wakana; Parker, J. D.*; Samoto, Tetsuo*; Yashiro, Wataru*; Momose, Atsushi*

Talbot-Lau interferometry with three gratings is a powerful imaging method which produces a radiography image, a differential phase imaging, and a visibility contrast image at one measurement. We develop a new neutron Talbot-Lau interferometer at "RADEN" beam line on the Materials and Life Science Experimental Facility (MLF) in Japan Proton Accelerator Research Complex (J-PARC). Since the alignment condition of Talbot-Lau interferometer allows use of several wavelengths at the same setup of gratings, we can carry out wavelength-resolved phase contrast imaging with time-of-flight measurement. This method utilizes intensive beam of spallation neutron source with avoidance of chromatic aberration at the sample, and gives more detailed sample information depending on wavelength. We have successfully performed Talbot-Lau imaging for several types of metal rods with wavelengths of 2.5, 5.0 and 7.5 A.