Dosimetria ambiental de areia monazítica das praias do litoral norte de São Paulo
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Data
2021-02-23
Autores
Teissiere, Luigi Leite [UNIFESP]
Orientadores
Tatumi, Sonia Hatsue [UNIFESP]
Tipo
Trabalho de conclusão de curso de graduação
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Resumo
Algumas praias do litoral norte de São Paulo apresentam areias monazíticas,
que são areias que contêm terras raras e isótopos radioativos, deste modo, é
possível afirmar que emite radiação gama. Quando o ser humano é exposto a
doses de radiação, pode resultar em alguns danos celulares, podendo evoluir
para um câncer. O objetivo deste trabalho é estabelecer uma análise da dose de
radiação gama emitida pela areia e comparar com os limites estabelecidos pelos
órgãos reguladores.
Foi utilizado o Detector de Germânio Puro de Camberra e a Rigaku MiniFlex 300
para as análises de dose anual das areias colhidas e as suas estruturas
cristalinas.
As doses das amostras da Praia da Mococa foram as que mais se aproximaram
do limite natural de 10 mSv/ano estabelecido pela CNEN. E também foram
encontradas estruturas de terras raras com o método de Difração de Raios X.
Some beaches on the north coast of São Paulo have monazitic sands, which are sands that contain rare earths and radioactive isotopes, so it is possible to say that it emits gamma radiation. When the human being is exposed to radiation doses, it can result in some cellular damage, which can progress to cancer. The objective of this work is to establish an analysis of the dose of gamma radiation emitted by the sand and to compare it with the limits established by Organs regulatory agencies. The Canberra Pure Germanium Detector and the Rigaku MiniFlex 300 were used for the analysis of the annual dose of the harvested sand and its crystalline structures. The doses of samples from Praia da Mococa were those that came closest to the natural limit of 10 mSv / year established by CNEN. And rare earth structures were also found using the X-Ray Diffraction method.
Some beaches on the north coast of São Paulo have monazitic sands, which are sands that contain rare earths and radioactive isotopes, so it is possible to say that it emits gamma radiation. When the human being is exposed to radiation doses, it can result in some cellular damage, which can progress to cancer. The objective of this work is to establish an analysis of the dose of gamma radiation emitted by the sand and to compare it with the limits established by Organs regulatory agencies. The Canberra Pure Germanium Detector and the Rigaku MiniFlex 300 were used for the analysis of the annual dose of the harvested sand and its crystalline structures. The doses of samples from Praia da Mococa were those that came closest to the natural limit of 10 mSv / year established by CNEN. And rare earth structures were also found using the X-Ray Diffraction method.
Descrição
Citação
TEISSIERE, Luigi Leite. Dosimetria ambiental de areia monazítica das praias do litoral norte de São Paulo. 2021. 51f. Trabalho de conclusão de curso de graduação (Bacharelado Interdisciplinar em Ciência e Tecnologia do Mar) - Instituto do Mar, Universidade Federal de São Paulo, Santos, 2021.