Análise de variações na radiação gama natural associada ao radônio e influência do campo elétrico atmosférico e efeitos meteorológicos
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Tipo
Dissertação
Data de publicação
2020-08-17
Periódico
Citações (Scopus)
Autores
Oliveira, Rafael Ricardo Rosa de
Orientador
Raulin, Jean Pierre
Título da Revista
ISSN da Revista
Título de Volume
Membros da banca
Szpigel, Sérgio
Makhmutov, Vladimir
Makhmutov, Vladimir
Programa
Ciências e Aplicações Geoespaciais
Resumo
Natural Gamma radiation is mainly produced during the interaction of energetic cosmic
rays in the Earth’s atmosphere, the decay of radionucleides from the soil and transient
energetic atmospheric phenomena. The variability of natural gama radiation and its
relation to the atmospheric electric field is important for a better understanding of phenomena
like thunderstorms and lightning. In this thesis, it is analyzed the natural gamma
ray radiation for different meteorological conditions and verify its relation with the atmospheric
electric field. The comparison is done for fair weather conditions on different
timescale: annual, seasonal and monthly variations. During disturbed weather conditions
it is reported and discussed events of abnormal and impulsive natural gamma radiation.
The data were extracted from the El Leoncito Observatory in Argentina from April, 2018
to February, 2019. In fair weather averages, it was possible to obtain a good correlation
between the local atmospheric electric field curve and the global electric field curve (Carnegie
curve) with a correlation coefficient of R = 0.94. In the curves of natural gamma
radiation, a pattern was strongly dependent on the levels of atmospheric turbulence, with
maximum radiation occurring close to sunrise and minimum occurring close to sunset.
On days when there were abnormal variations in natural gamma radiation, meteorological
conditions were analyzed and all events are generally preceded by thunderstorms and
may also be accompanied by precipitation
Descrição
Palavras-chave
campo elétrico atmosférico , circuíto elétrico atmosférico global , curva de Carnegie , radiação gama , radônio
Assuntos Scopus
Citação
OLIVEIRA, Rafael Ricardo Rosa de. Análise de variações na radiação gama natural associada ao radônio e influência do campo elétrico atmosférico e efeitos meteorológicos. 2020. 112 f. Dissertação (Ciências e Aplicações Geoespaciais) - Universidade Presbiteriana Mackenzie, São paulo, 2020.