Imaging experiments on NOBORU at MLF

Harada, Masahide   ; Oikawa, Kenichi   ; Oi, Motoki ; Kai, Tetsuya   ; Sakai, Kenji ; Maekawa, Fujio  ; Watanabe, Noboru*; Shinohara, Takenao   ; Takata, Shinichi  

A neutron beam line NOBORU built at MLF in J-PARC is suitable for imaging experiments due to a large beam size, a short distance from the moderator to the sample position and an adequate experimental room. In order to evaluate suitability for the imaging experiments, we measured neutron spectral intensities and flux distributions at the sample position of NOBORU. We also measured those quantities with use of some filters, collimators and slits equipped on NOBORU. As preliminary experiments for imaging, we measured Bragg edge transmission of some alloys and resonance absorption of some elements. The result showed welded and non-welded areas in an alloy could be clearly distinguished by the Bragg edge transmission. It was also found that several elements in the sample could be distinguished clearly by the resonance absorption method. It could be concluded that NOBORU was very suitable for the imaging experiments at J-PARC.