Natural and artificial nuclides in Salesópolis reservoir by gamma spectometry
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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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Natural radioactivity is ubiquitous in the environment mainly due to the presence
of the nuclides from the uranium and thorium series and K-40 in soil, water and
sediments. 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. Salesópolis is located in the Metropolitan Region of São Paulo city
(SPMR). The Usina Parque Rio Tietê (Salesópolis) reservoir belong to the Alto do
Tietê system for the capture, storage and treatment of water for the São Paulo
Metropolitan Region (SPMR). Therefore, the quality of the water, as well as, of
sediments of this dam is of great importance. In this study, the activity concentrations
of the natural uranium and thorium nuclides series, K-40 and the artificial Cs-137
were determined in a sediment core (T1B) with 42cm depth and sliced each 3 cm
totalizing 14 samples, collected in the middle of the Salesópolis dam. Samples were
sealed and wait 30 days for the radioactive equilibrium to be reached. The activity
concentrations were measured by gamma spectrometry. Samples were counted and
saved at regular intervals at a maximum of 160 000 seconds. The gross area were
calculated for each peak and plotted against time and the counting rate was obtained
by the sloop of the curve. The background and reference materials were treated in
the same way. Results showed that 228Th varied from 44 to 150 Bq kg1 ; 228Ra,
from 49 to 149 Bq kg1; 226Ra, from 26 to 88 Bq kg1; 210Pb, from 93 to 247
Bq kg1 ; 40K, from 127 to 852 Bq kg1 and 137Cs varied from 0.2 to 6.7 Bq kg1
Como referenciar
SILVA, P.S.C.; SEMMLER, R.; ZAHN, G.; ROCHA, F.R.; DAMATTO, S.R.; FAVARO, D.I.T. Natural and artificial nuclides in Salesópolis reservoir by gamma spectometry. 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. 97-97. Disponível em: http://repositorio.ipen.br/handle/123456789/28798. Acesso em: 13 Mar 2025.
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.