I-129 DETERMINATION IN EVAPORATOR CONCENTRATE USING OXIDATIVE EXTRACTION AND CHROMATOGRAPHIC RESIN

Authors

  • Thiago César de Oliveira Universidade Federal de Minas Gerais - UFMG Departamento de Engenharia Nuclear - DENU
  • Roberto Pellacani Guedes Monteiro Centro de Desenvolvimento da Tecnologia Nuclear - CDTN
  • Geraldo Frederico Kastner Centro de Desenvolvimento da Tecnologia Nuclear - CDTN
  • Arno Heeren de Oliveira Universidade Federal de Minas Gerais - UFMG Departamento de Engenharia Nuclear - DENU

DOI:

https://doi.org/10.15392/bjrs.v9i1A.1248

Keywords:

Iodine, Evaporator concentrate, Oxidative extraction, Chromatographic resin

Abstract

Determination of long-lived radionuclides is very important for study of the radioactive waste final deposition. In this work will be studied 129I radionuclide which present 1.6 x 107 years half-life, β-particle-emitting (Emax = 194 keV) and X-ray-emitting (E = 29.78 keV). It’s produced primarily from fission of 235U and 239Pu and for fission induced by thermal neutrons. For this reason, radiochemical procedures for 129I determination in evaporator concentrate wastes from nuclear power plants were carried out. The first procedure was based on oxidative extraction and alkaline absorption and the second one, was based on selective extraction using a chromatographic resin in order to separate iodine from its interferents. After the separation steps, the iodine activity was measured by ultra low gamma spectrometry technique. To set up the yield recovery for 129I, a tracer solution of 129I was used in order to follow the behavior of iodine during the separation steps. The yield recovery for iodine was around 75-80% for the first procedure and 80-85% for the second. The two procedures used mutually, ensure a greater efficiency in the separation of iodine from their respective interferents.

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References

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Published

2021-04-30

Issue

Section

The Meeting on Nuclear Applications (ENAN) 2019

How to Cite

I-129 DETERMINATION IN EVAPORATOR CONCENTRATE USING OXIDATIVE EXTRACTION AND CHROMATOGRAPHIC RESIN. Brazilian Journal of Radiation Sciences, Rio de Janeiro, Brazil, v. 9, n. 1A, 2021. DOI: 10.15392/bjrs.v9i1A.1248. Disponível em: https://www.bjrs.org.br/revista/index.php/REVISTA/article/view/1248.. Acesso em: 29 mar. 2024.

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