High spatial resolution neutron transmission imaging using a superconducting two-dimensional detector
Shishido, Hiroaki*; Nishimura, Kazuma*; Vu, TheDang*
; Aizawa, Kazuya
; Kojima, Kenji M*; Koyama, Tomio*; Oikawa, Kenichi
; Harada, Masahide
; Oku, Takayuki
; Soyama, Kazuhiko
; Miyajima, Shigeyuki*; Hidaka, Mutsuo*; Suzuki, Soh Y.*; Tanaka, Manobu*; Kawamata, Shuichi*; Ishida, Takekazu*
In this study, we employed a superconducting detector, current-biased kinetic-inductance detector (CB-KID) for neutron imaging using a pulsed neutron source. We employed the delay-line method, and high spatial resolution imaging with only four reading channels was achieved. We also performed wavelength-resolved neutron imaging by the time-of-flight method. We obtained the neutron transmission images of a Gd-Al alloy sample, inside which single crystals of GdAl
were grown, using the delay-line CB-KID. Single crystals were well imaged, in both shapes and distributions, throughout the Al-Gd alloy. We identified Gd nuclei via neutron transmissions that exhibited characteristic suppression above the neutron wavelength of 0.03 nm. In addition, the
Gd resonance dip, a dip structure of the transmission caused by the nuclear reaction between an isotope and neutrons, was observed even when the number of events was summed over a limited area of 15
m
12
m. Gd selective imaging was performed using the resonance dip of
Gd, and it showed clear Gd distribution even with a limited neutron wavelength range of 1 pm.