@article{oai:repo.qst.go.jp:00045700,
 author = {Miyahara, Nobuyuki and Honma, Toshihiro and Fujisawa, Takashi and 宮原 信幸 and 本間 壽廣 and 藤澤 高志},
 issue = {1},
 journal = {Nuclear Instruments & Methods in Physics Research Section B},
 month = {Jan},
 note = {An irradiation effect of a Nd-Fe-B permanent magnet by fast neutrons having a central energy of 10 MeV was investigated experimentally. The sample magnet (NEOMAX-39SH) had a rectangular shape of 25 mm 25 mm and 5 mm thick. The measured magnetic flux density decreases at the center of the sample magnets were 0.6%, 6.9%, 25.2% and 47.3% after continuous irradiation of 1.1 kGy, 3.7 kGy, 5.6 kGy and 7.4 kGy, respectively. On the other hand, the decrease due to non-continuous irradiation, in which the magnet was irradiated at 3.7 kGy firstly, and then irradiated again at 3.7 kGy 9 months later, was 14% smaller than that of continuous irradiation, even for the same total dose. The temperature coefficient of the magnetization did not change with the neutron irradiation. Some kinds of radioactive materials, such as 147Nd, 151Pm, and 54Mn, were detected in the magnet after irradiation.},
 pages = {57--61},
 title = {Irradiation effects of a 10 MeV neutron beam on a Nd-Fe-B permanent magnet},
 volume = {268},
 year = {2010}
}