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- W2960736791 abstract "Theoretical calculations have been made to estimate the attenuation and the generation of gamma photons by a model of a tropical rain forest environment. For typical flight altitudes of 100 meters, it is shown that a 35 meter high canopy can attenuate from 40% to 60% of the original gamma photons, depending on the energy considered. It is also shown that the 1.46 MeV photopeak of 40-K measured at flight altitudes is completely dominated by the forest generated component, whereas this effect is negligible for the 2.62 MeV of 208-Tl and the 1.76 MeV of 214-Bi. Of major importance are the effects of forest clearings on the gamma-ray spectrum which can lead to serious misinterpretations of aerial profile data if not taken into account. A short review on the biocycles of potassium from the soil to the biomass of the tropical rain forest is included in the article. A simple experiment has also been made to demonstrate the attenuation due to a forest biomass on the gamma radiation emitted by the soil. Resumo A atenuação e a producao de fotons de radiação gama em um modelo de ambiente de floresta tropical úmida, foram calculadas teoricamente. Para alturas tipicas de voo de 100 metros, demonstrou-se que uma cobertura de floresta de 35 metros pode atenuar de 40% a 60% da radiação gama original, dependendo da energia considerada. Alem disso, o fotopico de 1,46 MeV do40K determinado para a altura tipica de voo, foi completamente dominado pela fracao gerada pela floresta. Esse efeito foi desprezivel no caso dos fotopicos de 2,62 MeV do208Tl e 1,76 MeV do214Bi. Os efeitos do desmatamento no espectro de radiação gama não devem ser desprezados e pode-se incorrer em graves erros na interpretação dos dados nos perfis aereos caso esses fatores não sejam considerados. Uma revisão sucinta sobre os biociclos do pot á ssio do solo para a biomassa na floresta tropical umida foi incluida no artigo. Finalmente, foi montada uma experiencia simples a fim de demonstrar o fenomeno da atenuação da radiação gama na presença de uma cobertura de floresta. absorption, biomass, earth atmosphere, forests, gamma radiation, gamma spectroscopy, geophysical surveys, natural radioactivity, tropical regions Para solicitação do pdf, entrar em contato com editor-chefe (editor@sbgf.org.br)." @default.
- W2960736791 created "2019-07-23" @default.
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- W2960736791 date "2018-07-11" @default.
- W2960736791 modified "2023-10-05" @default.
- W2960736791 title "Os Mecanismos de Difusão e Transporte Convectivo na Formação de Anomalias Superficiais do Radônio-222 gerado em Profundidade" @default.
- W2960736791 doi "https://doi.org/10.22564/rbgf.v1i1.994" @default.
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