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Nuclear reaction microanalysis of boron doped steels

2007; Elsevier BV; Volume: 260; Issue: 1 Linguagem: Inglês

10.1016/j.nimb.2007.02.041

1872-9584

Hajime Shibata, Yutaka Kohno, Koji Shibata, Takahiro Sato, M. Oikawa, J. Haga, Takuro Sakai,

Fusion materials and technologies

The microanalysis of trace amounts of boron has been carried out using a 1 μm proton microbeam from the 3 MV single-ended electrostatic accelerator of TIARA facility, JAEA Takasaki. Steel specimens containing 20–100 ppm boron have been bombarded by 1.7 MeV proton beam for γ-ray detection and 1.32 MeV H2+ beam for α-particles. The maps of boron distribution have been measured by detecting 428 keV γ-rays emitted from the 10B (p, α′γ) 7Be nuclear reaction and 3.7 MeV α-particles from the 11B (p, α) 8Be nuclear reaction. As a result of imaging, segregation of several micron sized boron precipitates could be clearly seen.