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Master's Dissertation
DOI
10.11606/D.54.1984.tde-09122013-120019
Document
Author
Full name
Marcilio de Freitas
Institute/School/College
Knowledge Area
Date of Defense
Published
São Carlos, 1984
Supervisor
Committee
Ferreira, Guilherme Fontes Leal (President)
Alfaro, Renê Armando Moreno
Gross, Bernhard
Title in Portuguese
Uma câmara de ionização sólida
Keywords in Portuguese
Câmara de ionização sólida
Corrente elétrica
Abstract in Portuguese
Assumindo elétrons e buracos se movimentando em suas bandas próprias e centros de recombinação independente para ambos, Hughes e Sokel calcularam as características e distribuição de cargas para o oxido de chumbo (PbO) quando este se encontra sob radiação. O cálculo também inclui a corrente de difusão e segundo os autores, esta possui um importante papel em muitos aspectos. Neste trabalho a característica para o PbO foi recalculado sem considerar a contribuição da corrente de difusão e essencialmente foi obtido o mesmo resultado. Foram desenvolvidos aproximações para baixo e alto campo. Em seguida, foram assumidos iguais parâmetros para ambos portadores (isto é, iguais mobilidades, tempos de captura, coeficientes de recombinação e densidades de centros de captura) e obtido as características para 18 combinações de três conjuntos de parâmetros convenientemente definidos. Aproximações de campo baixo e campo alto foram também derivadas para este caso
Title in English
A solid ionization chamber
Keywords in English
Electric currents
Solid ionization chamber
Abstract in English
Assuming electron and hole bands and independent recombination centers or both carriers, Hughes and Sokel calculated the characteristics and charge distributions for lead oxide PbO under irradiation. The calculation also included the diffusion current and it was asserted that such a current was important in some aspects. In this work the characteristic for PbO was recalculated without the diffusion component and essentially the same result was obtained. Side this; approximations were derived for low and high fields. Next, assuming equal parameters for both carriers (that is, equal mobilities, trapping times, recombination rates and density of trap), characteristics were obtained for 18 combinations of three conveniently defined set of parameters. Low and high field approximation were also derived for this case
 
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Publishing Date
2013-12-10
 
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