title: ESR study of Gd3+ and Mn2+ ions sorbed on hydroxyapatite.
abstract: Adsorption of Gd3+ and Mn2+ into hydroxyapatite (HAP (Ca5(PO4)3(OH)2) was studied by ESR, ion chromatography and ICP-AES to investigate the U-uptake model. HAP absorbed Gd3+ via a cation exchange reaction and resulted in a signal width of 240 mT. The growth of the thermally stable Gd3+ signal in HAP was also fitted by saturation and diffusion equations. The ESR signals of Gd3+ and Mn2+ were observed overlapping the CO2- signals, however, the dose-response curves of the CO2- signal were similar to that of control HAP.
authors.affiliation: Department of Earth and Space Science, Graduate School of Science, Osaka University, 1-1 Machikaneyama, Toyonaka, Osaka, 560-0043, Japan. matsuda.tokiyoshi@kochi-tech.ac.jp
authors.forename: Tokiyoshi
authors.initials: T
authors.lastname: Matsuda
authors.forename: Chihiro
authors.initials: C
authors.lastname: Yamanaka
authors.forename: Motoji
authors.initials: M
authors.lastname: Ikeya