Fig. 2

Schematic representation of the radial distribution of cesium (Cs) in the xylem of normal konara oak (Quercus serrata) trees after 3-h, 1-day, or 4-day injection, as observed using cryo-scanning electron microscopy/energy-dispersive X-ray spectroscopy (cryo-SEM/EDX). Bars below each sample image represent the areas where Cs was detected. VL, vessel lumen; VW, vessel cell wall; FL, fiber lumen; FW, cell wall between fibers; RL, ray parenchyma cell lumen; RW, cell wall between ray parenchyma cells; AL, axial parenchyma cell lumen