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A proton microprobe scanning across the vertebra of a flat fish,Paralichthys olivaceus
Authors:M Ishikawa  T Ishii  S Uchida  K Kitao
Institution:(1) Division of Marine Radioecology, Nakaminato Laboratory for Radioecology, National Institute of Radiological Sciences, Nakaminato, Ibaraki, Japan;(2) Division of Physics, National Institute of Radiological Sciences, Anagawa 4-9-1, 260 Chiba, Japan
Abstract:Elemental distributions across the vertebra of a flat fish were determined by a 100×300 μm proton scanning microprobe. By normalizing with proton currents, 22 elements demonstrated characteristic patterns in locality; Si, Ca, Cr, Ga, Sr, and I were homogeneous across the vertebral centrum, whereas concentrations of P, Ti, V, Co, Ni, Cu, Hg, Se, and Br were increasingly higher toward the inside of the centrum. Opposite results were obtained for S and Cl, and especially Fe, which showed gradually lower concentrations toward the center. The K, Mn, and Zn were higher in concentration at both edges, showing a minimum value at the middle of the vertebra centrum, where Pb was at a maximum in its distribution. The fact that such a thin intervertebrale membrane contains relatively large amounts of Cl, K, Ca, Fe, Zn, Pb, Br, and I is interesting.
Keywords:PIXE  microprobe-scanning  flat fish  Paralichthys olivaceus  vertebra  cross-section  trace element distribution  across vertebra of flat fish
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