Nuclear forensics
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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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Resumo
The use of environmental monitoring as a technique to identify activities related
to the nuclear fuel cycle has been proposed, by international organizations, as an additional
measure to the safeguards agreements in force. The elements specific for each
kind of nuclear activity, or "nuclear signatures", inserted in the ecosystem by several
transfer paths, can be intercepted with better or worse ability by different live organisms.
Depending on the kind of signature of interest, the anthropogenic material
identification and quantification require the choice of adequate biologic indicators and, mainly, the use of sophisticated techniques associated with elaborate sample
treatments. This work demonstrates the technical viability of using pine needles
as bioindicators of nuclear signatures associated with uranium enrichment activities.
Additionally, it proposes the use of a technique widely diffused nowadays in the scientific
community, the High Resolution Inductively Coupled Plasma Mass Spectrometer
(HR-ICP-MS), to identify the signature corresponding to that kind of activities in
the ecosystem. It can be also found a description of a methodology recently being
applied in analytical chemistry, based on uncertainties estimates metrological concepts,
used to calculate the uncertainties associated with the obtained measurement
results. Nitric acid solutions with a concentration of 0.3 mol kg1, used to wash
pine needles sampled near facilities that manipulate enriched uranium and containing
only 0.1 g kg1 of uranium, exhibit a 235U:238U isotopic abundance ratio of 0.0092
? 0.0002, while solutions originated from samples collected at places located more
than 200 km far from activities related to the nuclear fuel cycle exhibit a value of
0.0074 ? 0.0002 for this abundance ratio. Similar results were obtained for sample
solutions prepared by microwave assisted acid digestion and dry ashing process. The
different values of 235U:238U isotopic abundance ratio obtained for samples collected
in different places permit to confirm the presence of anthropogenic uranium and
demonstrate the viability of using this technique and the methodology proposed in
this work.
Como referenciar
SARKIS, J.E.S.; MARIN, R.C.; PESTANA, R.C.B. Nuclear forensics: strategies and analytical techniques. 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. 66-67. Disponível em: http://repositorio.ipen.br/handle/123456789/28765. Acesso em: 11 May 2024.
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.