Incident energy dependence of nuclear reaction imaging of boron doped in iron

Shibata, Hiromi*; Kono, Yutaka*; Sato, Takahiro; Okubo, Takeru; Yamazaki, Akiyoshi; Ishii, Yasuyuki; Yokoyama, Akihito; Koka, Masashi

The measurement of incident energy dependence of nuclear reaction imaging of trace amount of boron in iron has been carried out using 23 m proton microbeam from 3 MV single ended electrostatic accelerator of TIARA facility, JAEA Takasaki. Steel specimens containing 100 ppm boron have been bombarded by 1.5 - 2.5 MeV proton beam. The maps of boron distribution have been taken by detecting ray (428 keV) emitted from B(p, ')Be nuclear reaction. As a result of mapping dependent on incident energy, aggregation of boron of several microns in depth can be clearly seen.