摘要: The SP-PIXE has been installed on the 8 MV Pelletron accelerator of the IFUSP. Its characteristics and calibration procedure are presented below. The SP-PIXE is being used as the reference analytical method on a national monitorin... 展开 The SP-PIXE has been installed on the 8 MV Pelletron accelerator of the IFUSP. Its characteristics and calibration procedure are presented below. The SP-PIXE is being used as the reference analytical method on a national monitoring air quality program performed by the Group for Air Pollution Studies (GEPA) of the IFUSP. As part of the program eight sites around Brazil, seven having critical air pollution problems and one with natural atmosphere, have been selected for sampling. Each aerosol is sampled continuously for one year using stacked filter units and, for period of 3 to 5 days, by 10-stage cascade impactors. Partial results from the first two sites investigated are presented here by figures of element size distribution curves and histograms of relative concentrations. (Atomindex citation 16:009914) 收起