Figure 3
(a) X-ray fluorescence image of metal wires (Cu: diameter 25 µm; Ni: diameter 25 µm; Co: diameter 50 µm; Fe: diameter 100 µm). The exposure time was 8 min. (b) X-ray fluorescence spectra in the white rectangle areas in (a). These spectra were calculated from 240 X-ray fluorescence images recorded on the CCD in the photon-counting condition. The exposure time of each image was 5 s. |