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Master's Dissertation
DOI
https://doi.org/10.11606/D.11.1994.tde-20210918-200951
Document
Author
Full name
Alina Célia Banzatto Amaral
Institute/School/College
Knowledge Area
Date of Defense
Published
Piracicaba, 1994
Supervisor
Title in Portuguese
Implantação da metodologia de densitometria de raios-X em madeira
Keywords in Portuguese
DENSITOMETRIA DE RAIOS X
MADEIRA
Abstract in Portuguese
O presente trabalho teve como objetivo o desenvolvimento e implantação da metodologia de um novo método de determinação de densidade da madeira em nosso país, a densitometria de raios-X. Pesquisas básicas foram realizadas para o estabelecimento das várias etapas necessárias à implantação desta técnica, a saber: a) tipo, preparo e acondicionamento das amostras de madeira a serem utilizadas; b) tipo de filme a ser usado; c) tipo de aparelho de raios-X que permitisse a obtenção das radiografias da madeira, assim como as condições de exposição dos filmes; d) tipo de processamento mais adequado; e) o uso do aparelho (microdensitômetro) utilizado para determinar a densidade ótica das amostras; f) a confecção dos padrões para obtenção das curvas de calibração e; g) o desenvolvimento de um sistema computacional para registrar, transformar e analisar os dados. Para permitir a visualização dos resultados, é fornecido um exemplo prático de análise densitometria de amostras retiradas de discos da base de árvores de <i>Pinus taeda</i>, coletadas dentro de diversas classes de diâmetro. O trabalho permitiu o estabelecimento completo da técnica. Os resultados obtidos são comparáveis àqueles obtidos em outros países.
Title in English
Implementation methodology of X-ray densitometry in wood
Abstract in English
The present work had as its aim the development and implementation of the methodology of a new method to determine wood density in this country: X-ray densitometry. Basic research was done to establish the following stages required to implement this technique: a) kind, preparation and acclimatization of the wood samples to be used; b) kind of film to be used; c) kind of X-ray apparatus that would allow us to obtain the radiographs of the exposure conditions of the films; d) the most adequate kind of processing; e) the utilization of the apparatus (microdensitometer) used to determine the optical density of the samples; f) the establishment of the standards for obtaining the calibration curves; g) the development of a computing system to record, transform and analyse the data. ln order to allow the visualization of the results a practical example is given of the densitometry analysis of samples taken from base discs of <i>Pinus taeda</i>, L., trees collected from several diameter classes. This work has allowed the complete development of the technique. The results obtained are comparable to those obtained abroad.
 
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Publishing Date
2021-09-18
 
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