Application of positron microprobe for nuclear materials
A lateral scanning of a positron microbeam can supply the information of spatial distribution of positronic properties near the subsurface region. We have developed the positron microprobe for the study of stress corrosion cracking on stainless steels used for nuclear power plants. We originally developed a small-sized source with an active diameter of～2 mm. Amounts of 55 MBq of 22Na is sealed in this source. Solid neon is used for the moderator. The slow positron beam is formed by the electrostatic lens at the positron gun, and is transported by the four magnetic lenses. The objective lens equipped with a commercial scanning electron microscope is used for the production of the positron microbeam. By scanning of a sample stage, two-dimensional distribution of S parameter can be acquired by detecting annihilation gamma rays by a HPGe detector.
M.Maekawa A.Kawasuso Y.Miwa T.Hirade
ASRC,Japan Atomic Energy Agency,1233,Watanuki,Takasaki,Gunma 370-1292 Japan NSED,Japan Atomic Energy Agency,2-4Happo-Shirane,Tokai,Naka,Ibaraki,319-1195 Japan
国际会议
第九届国际正电子与正电子素国际会议(9th International Workshop on Positron and Positronium Chemistry)(PPC–9)
武汉
英文
87
2008-05-11（万方平台首次上网日期，不代表论文的发表时间）