APPLICATION OF MICRO-PIXE IN ATMOSPHERIC ENVIRONMENTAL SCIENCE RESEARCH: ELEMENTAL MAPS IN ROOT OF SIEBOLD'S BEECH SEEDLING

摘要

Micro-beam scanning PIXE (micro-PIXE) and scanning transmission ion microscopy (STIM) were applied to measurement of one-year-old seedling root from a Siebold's beech (Fagus crenata Blunie) tree. The beech seedling root samples were collected at the centerpiece of the Shirakami-Sanchi World Heritage Area during October 2001. Target samples for micro-PIXE and STIM analyses were transverse sections from tip, midpoint and root of the beech seedling root. We focused shedding light on tree root metabolism, and are to get a real image about the elemental distribution in the tree root. STIM images were similar to those generated using stercomicroscope and/or transmission microscopy. Real images in the form ofelemental maps were obtained for nine elements: Na, Mg. Al, Si, P. S, CI, K. and Ca. Of these, typical elemental maps were Si and Ca, which were both concentrated in the epidennis. Si was prominent in the tip, while Ca was prominent in the root.