Data/hora: 08/06/2024 13:30:24

Provedor de dados: | 63
País: | Brazil
Título: | EXACT EQUATIONS FOR SOIL PARTICLE-SIZE ANALYSIS BY GAMMA-RAY ATTENUATION
Autores: | Elias,Elimoel Abraão; Bacchi,Osny Oliveira Santos; Reichardt,Klaus.
Data: | 1999-01-01
Ano: | 1999
Palavras-chave: | Granulometry; Soil mechanical analysis; Soil texture; Gamma attenuation.
Resumo: | Soil particle-size analysis by gamma-ray attenuation was first suggested in 1992 and improved in 1997 by diminishing the measurement time and adapting it for automation. It is here demonstrated that when the mass attenuation coefficient &lt;FONT FACE="Symbol"&gt;m&lt;/font&gt;w and the density Dw are replaced by &lt;FONT FACE="Symbol"&gt;m&lt;/font&gt;s and Ds (where the subscripts w and s stand for water and solution) in the approximate equations used to estimate the concentration of suspended particles, they become exact. The demonstration is based by treating the dispersant and water solution as one single medium, instead of treating them as two media. In this way, six variables are reduced to only three. Physical considerations suggest that the precision in this analysis could be improved if other types of solutions and of photon energies would be used, so that the attenuation by the particles would differ more significantly from the attenuation by the solution.
Tipo: | Info:eu-repo/semantics/article
Idioma: | Inglês
Identificador: | http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-90161999000100014
Editor: | São Paulo - Escola Superior de Agricultura "Luiz de Queiroz"
Relação: | 10.1590/S0103-90161999000100014
Formato: | text/html
Fonte: | Scientia Agricola  v.56 n.1 1999
Fonte: | info:eu-repo/semantics/openAccess