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Type: Artigo de periódico
Title: The Technicians Nasvd And Mnf And His Application In The Reduction Of Noises In Data Gamaespectrométricos [as Técnicas Nasvd E Mnf E Sua Aplicação Na Redução De Ruídos Em Dados Gamaespectrométricos]
Author: Cavallaro F.A.
Portugal R.S.
Silva A.M.
Bizuti A.M.
Abstract: The radioactive decay is a random process, and the measurement precision is ruled by statistical laws. The counting ratios of the profiles are always noisy when analyzed for short periods, such as one second per measurement. Corrections made at the end of conventional processing in the airborne gamma-ray spectrometric method data are not enough to remove and minimize, or even reduce considerably, the spectrum's originated noise. Two statistic methods that act locally in collected data, in the spectrum domain, have been suggested by literature to remove such remaining noises, the Noise-Adjusted Singular Value Decomposition - NASVD and Maximum Noise Fraction - MNF. These methods produce a significantly noise reduction. In this work both methods were applied in an area comprehended by two blocks, I and II, of the airborne survey that covers the west area of Mineral Province of Tapajós between Pará and Amazon states. The filtered and non-filtered data with the NASVD and MNF techniques were processed with the Lasa's parameters. The comparison of results between maps and profiles shows that both methods are valuable, since there was resolution gain in these products. © 2009 Sociedade Brasileira de Geofísica.
Rights: aberto
Identifier DOI: 
Date Issue: 2009
Appears in Collections:Unicamp - Artigos e Outros Documentos

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