Accumulation of elements in the annual rings trees measured by synchrotron x-ray fluorescence microanalysis - Vives, Ana Elisa Sirito; Cunha e Silva, Richard Maximiliano da; Medeiros, Jean Gabriel; Tomazello, Mário; Barroso, Regina Cely Rodrigues; Zucchi, Orghêda Luiza Araujo Domingues; Moreira, Silvana (Activity Report Brazilian Synchrotron Light Laboratory 2003, 2004)