Study methods of parameters and processes of marine sedimentary dynamics with natural and artificial radionuclides

• Grant number: 14/08016-6
• Support Opportunities: Scholarships in Brazil - Doctorate
• Start date: July 01, 2014
• End date: June 30, 2018
• Field of knowledge: Physical Sciences and Mathematics - Oceanography - Chemical Oceanography
• Agreement: Coordination of Improvement of Higher Education Personnel (CAPES)
• Principal Investigator: Rubens Cesar Lopes Figueira
• Grantee: Paulo Alves de Lima Ferreira
• Host Institution: Instituto Oceanográfico (IO). Universidade de São Paulo (USP). São Paulo , SP, Brazil

Abstract

The ubiquity of artificial and natural radionuclides in different environmental matrices can utilized as a tool in oceanographic studies, as these nuclides record processes in spatial and temporal scales according to their levels and spatial and vertical distribution in sediments. Within this context, this project aims to establish a set of methodologies for sampling, chemical analysis, data processing and oceanographic application of natural (K-40, Pb-210, Ra-226, Th-230, Th-232, U-235 and U-238) and artificial radionuclides (Cs-137, Pu-239 and Am-241) using gamma spectrometry technique. With these elements, chemical and mathematical modeling for dating and calculation of sedimentation rates, relationships between sediment parameters (such as particle size) and origin and destination of marine sediments will be studied. A large set of sediment samples of diverse origins will be used, surface samples and cores from coastal and deep water oceanographic systems will be used. In addition, it will proposed a new methodology for the determination of artificial radionuclides (Pu-239 and Am-241 ) in sediments through gamma spectrometry. (AU)

Scientific publications

(4)

(References retrieved automatically from Web of Science and SciELO through information on FAPESP grants and their corresponding numbers as mentioned in the publications by the authors)

DE LIMA FERREIRA, PAULO ALVES; COSTA, KAREN BADARACO; DE LIMA TOLEDO, FELIPE ANTONIO; LOPES FIGUEIRA, RUBENS CESAR. Sedimentation rates and age modeling of Late Quaternary marine sediments with unsupported Th-230. Journal of Radioanalytical and Nuclear Chemistry, v. 304, n. 2, p. 829-836, MAY 2015. (14/08016-6)

DE LIMA FERREIRA, PAULO ALVES; LOPES FIGUEIRA, RUBENS CESAR; SIEGLE, EDUARDO; ASP NETO, NILS EDVIN; MARTINS, CESAR DE CASTRO; FRANCA SCHETTINI, CARLOS AUGUSTO; MACIEL, PABLO MUNIZ; GARCIA-RODRIGUEZE, FELIPE; DE MAHIQUES, MICHEL MICHAELOVITCH. Using a cesium-137 (Cs-137) sedimentary fallout record in the South Atlantic Ocean as a supporting tool for defining the Anthropocene. ANTHROPOCENE, v. 14, p. 34-45, JUN 2016. (14/08016-6, 09/01211-0, 06/04344-2, 11/50581-4)

DE LIMA FERREIRA, PAULO ALVES; AMORIM, LAIS FARINA; TURA, PEDRO MARONE; MEDEIROS ZACHEO, VALTER ANDRE; LOPES FIGUEIRA, RUBENS CESAR. Levels of Cs-137 and K-40 in marine superficial sediments near the Angra Nuclear Power Plant (Angra dos Reis, SE Brazil). RADIOCHIMICA ACTA, v. 103, n. 10, p. 729-735, OCT 2015. (14/08016-6)

DE LIMA FERREIRA, PAULO ALVES; COSTA, KAREN BADARACO; DE LIMA TOLEDO, FELIPE ANTONIO; LOPES FIGUEIRA, RUBENS CESAR. Sedimentation rates and age modeling of Late Quaternary marine sediments with unsupported Th-230. JOURNAL OF RADIOANALYTICAL AND NUCLEAR CHEMISTRY, v. 304, n. 2, p. 8-pg., 2015-05-01. (14/08016-6)

Academic Publications

(References retrieved automatically from State of São Paulo Research Institutions)

FERREIRA, Paulo Alves de Lima. Methods of study of variables and processes of marine sedimentary dynamics with natural and artificial radionuclides. 2018. Doctoral Thesis - Universidade de São Paulo (USP). Instituto Oceanográfico (IO/DIDC) São Paulo.