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Analysis of Atmospheric Aerosols Using the Lisbon Nuclear Microprobe

2001; Polish Academy of Sciences; Volume: 100; Issue: 5 Linguagem: Inglês

10.12693/aphyspola.100.781

1898-794X

E. Rita, L.C. Alves, M.A. Reis, F Rodrigues, Paulo Fialho, Joaquina Soares,

Radioactive Decay and Measurement Techniques

9701-851 T erra Ch ã, Ang ra do HeroÇ ±sm o, Azores, Po rtug alT h e nuclear m icr opro be install ed at I nstituto T ecnol Ç ogico e N uclear , in Lisb on, was used in the anal ysi s of aerosols collected at the Azores islands .Samples from tw o di˜erent aerosol groups w ere analysed .One referred to aerosols that w ere carried from N orth A merica and the other one contained aerosols that were carried from the Sahara desert and crossed over Europ e. C oarse and Ùne fractions were analysed for each aerosol group and tw o-dimensional elemental maps were constructed, w hich allow ed the identi-Ùcation of several indivi du al particles.For particles of interest, elemental spatial correlations and dimension s w ere determined and point analysi s w as also carried out (depth inf ormation w as achieved by Ùtting Rutherf ord bac kscattering spectra ).Some of these particles are quite interesting.F or instance, in the Ùne fraction of the aerosols that w ere carried from N orth A merica, particles w ere found with Cu and Cl in the atomic prop ortion 1:2 and w ith dimension s 1 5 È 15 È 15 ñ m 3 , and in the corresp ondi ng coarse fraction a particle w ith K and S w as identiÙed, with dimensi ons 2 8 È 35 È 3 0 ñ m 3 .Some di˜erences w ere found betw een the aerosols groups.One example of these are T i particles (Ùne fraction) and Rb (coarse fraction) that w ere identiÙed in one group (Sahara desert and Europ e), but not in the other.