SR-TXRF detection limit reduction using thin polymer film substrates Poli, V. S. ; Tabacniks, M. H. ; Rizzutto, M. A. ; Added, N. ; Espinoza-Quiñones, F. R. ; Palácio, S. M. Abstract Publication: Brazilian Journal of Physics Pub Date: September 2004 DOI: 10.1590/S0103-97332004000500072 Bibcode: 2004BrJPh..34..970P