The measurement is made using a counting time of 0.1 min/step of
angle (0.024° of 2θ). The total measured angle for each element is
displayed in Table 2. Taking into account the elements measured, the
total measuring time for one sample was approximately 15 min. In all
cases, the Kα line was used to element determination, except for As,
for which Kβ was employed to avoid interferences of the As Kα
(10.53 keV) with Pb Lα (10.55 keV). Pb and Bi were determined by
using the Lβ line.