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AbstractAbstract
[en] The set-up and calibration of the PIXE-SP System of Elementary Analysis located at the Institute of Physics of the University of Sao Paulo is described. The PIXE-SP, that operates with 8 MeV alpha beam, has been calibrated for elements with Z >= 11, by means of homemade evaporated standard targets of Al, Si, Bacl2, K2CrO4, Ti, Cr, Mn, Fe, Cu, Ge, Ag, Sn, and Au. Those targets are thin, homogeneous, and have been calbrated on a microbalance within an average precision of 6%. The overall precision of the PIXE-SP System is estimated in 10% for elements with 16 <= Z < 30, going up to 30% for the others. The detection limit of a blank Kimfol target 220 μg/cm2 thick, irradiated with a 10 μC electric charge, shows a minimum of about 0,1 ng (approximated 4 ppm) for Mn. The PIXE-SP System has also been intercalibrated with the PIXE located at University of Gent, Belgium, by means of 12 atmospheric aerosol targets collected on two Batelle Cascade Impactors. The analyzed masses of elements with 16 <= Z < 30 agree within 20%. (Author)
[pt]
Descreve-se a implantacao e calibracao do Sistema PIXE-SP de Analise Elementar no Instituto de Fisica da Universidade de Sao Paulo. O PIXE-SP, que opera com alfas de 8 MeV, foi calibrado quantitativamente para as linhas Kα e Lα de elementos com 11 <= Z < 40 e Z > 30 respectivamente. Utilizaram-se alvos-padroes evaporados de Al, Si, BaCl2, K2CrO4, Ti, Cr, Mn, Fe, Cu, Ge, Ag, Sn e Au. Os padroes, preparados no proprio IFUSP, sao finos, homogeneos e foram calibrados por gravimetria com precisao media de 6%. A precisao da calibracao do PIXE-SP foi avaliada em cerca de 30% para elementos com Z < 16 e Z > 30, melhorando para 10% em media, para 16 <= Z < 30. O limite de deteccao estimado num alvo de Kimfol com 220 μg/cm2 de espessura, irradiado com 10 μC de carga, apresenta o minimo de 0,1 ng (aproximadamente 4 ppm) no Mn. O PIXE-SP foi intercalibrado com o PIXE da Universidade de Gent, Belgica, por meio de 12 amostras de aerossol atmosferico coletadas pro Impactador em Cascata, modelo Batelle. Para 16 <= Z <= 30 os resultados concordam em 20%. (Autor)Original Title
Calibracao do sistema PIXE-SP de analise elementar
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Source
Apr 1983; 114 p; Tese (M.Sc.).
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Miscellaneous
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Thesis/Dissertation
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