Natural and artificial nuclides in Salesópolis reservoir

Authors

  • Paulo Sergio Cardoso Silva Instituto de Pesquisas Energéticas e Nucleares
  • Renato Semmler Instituto de Pesquisas Energéticas e Nucleares
  • Guilherme Soares Zahn Instituto de Pesquisas Energéticas e Nucleares
  • Flávio Roberto Rocha Instituto de Pesquisas Energéticas e Nucleares
  • Sandra Rerina Damatto Instituto de Pesquisas Energéticas e Nucleares
  • Déborah Inez Teixeira Fávaro Instituto de Pesquisas Energéticas e Nucleares

DOI:

https://doi.org/10.15392/bjrs.v7i2A.657

Keywords:

Salesópolis, natural radionuclides, artificial radionuclides, reservoir

Abstract

Natural radioactivity is ubiquitous in the environment mainly due to the presence of the nuclides from the uranium and thorium series and 40K. Although in the South Hemisphere nuclear tests have been fewer in number than that in the North, artificial radionuclides can also be found spread at ground level. In this study, the activity concentrations of natural nuclides from the uranium and thorium series, 40K and the artificial 137Cs were determined in a sediment core with 42 cm depth collected in the middle of the Salesópolis reservoir, located in the Metropolitan Region of São Paulo city (SPMR). The Usina Parque Rio Tietê reservoir belongs to the Alto do Tietê system for the capture, storage and treatment of water for SPMR. Therefore, the quality of the water and sediments of this dam is of great importance. The activity concentrations were measured by gamma spectrometry. Samples were measured and saved at regular intervals at a maximum of 160 000 seconds. The gross area were determined for each peak and plotted against time and the counting rate was obtained by the slope of the curve. Background and reference materials were also counted and treated in the same way. Results showed that 226Ra varied from 45 to 116 Bq kg-1; 228Ra, from 80 to 165 Bq kg-1; 40K, from 155 to 1 187 Bq kg-1 and 137Cs varied from 0.3 to 7 Bq kg-1. The methodology applied for determining low levels of 137Cs in sediment proved to be efficient and reproducible.

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Published

2019-02-19

How to Cite

Silva, P. S. C., Semmler, R., Zahn, G. S., Rocha, F. R., Damatto, S. R., & Fávaro, D. I. T. (2019). Natural and artificial nuclides in Salesópolis reservoir. Brazilian Journal of Radiation Sciences, 7(2A (Suppl.). https://doi.org/10.15392/bjrs.v7i2A.657

Issue

Section

The Meeting on Nuclear Applications (ENAN)

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