Apprehension of thorianite in Brazil
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2017
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60 YEARS OF IEA-R1: INTERNATIONAL WORKSHOP ON UTILIZATION OF RESEARCH REACTORS
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Thorianite is a strongly radioactive thorium’s mineral (ThO2) which often contains
uranium, lead and rare earth elements. It is a very heavy, hard, and colored
dark gray to brownish black or bluish black. In the environment can be found in
pegmatite, beach sands, and alluvial deposits. Despite to be considered a rare mineral
it can be found in several parts of the world. The main occurrence areas in
Brazil are alluvial deposits located in the Municipalities of Porto Grande, Serra do
Navio and Pedra Branca in the Amapa State (Amazon Rainforest). Besides thorium,
the mineral has high contents of uranium, lead and rare earths which represents an
important commercial and strategic value. During the last decades several tons of
this mineral have been apprehended by Brazilian Federal Police. This situation is
extremely serious considering that these numbers just represent a very small part of
the total of the smuggled amount. The main questions are : Who? To whom? and
With which objective? This paper will present the more recent data and a nuclear
forensic perspective of the nowadays situation.
Como referenciar
SARKIS, J.E.S.; NASCIMENTO, M.R.L.; QUINELATO, A.L.; SILVA, N.C. Apprehension of thorianite in Brazil: a nuclear forensic perspective. In: 60 YEARS OF IEA-R1: INTERNATIONAL WORKSHOP ON UTILIZATION OF RESEARCH REACTORS, November 28 - December 01, 2017, São Paulo, SP. Abstract... São Paulo, SP: Instituto de Pesquisas Energéticas e Nucleares, 2017. p. 70-70. Disponível em: http://repositorio.ipen.br/handle/123456789/28770. Acesso em: 20 Mar 2026.
Esta referência é gerada automaticamente de acordo com as normas do estilo IPEN/SP (ABNT NBR 6023) e recomenda-se uma verificação final e ajustes caso necessário.