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Title: Absorbed Dose Rate Due to Intake of Natural Radionuclides by Tilapia Fish (Tilapia nilotica,Linnaeus, 1758) Estimated Near Uranium Mining at Caetite, Bahia, Brazil

Abstract

The uranium mining at Caetite (Uranium Concentrate Unit--URA) is in its operational phase. Aiming to estimate the radiological environmental impact of the URA, a monitoring program is underway. In order to preserve the biota of the deleterious effects from radiation and to act in a pro-active way as expected from a licensing body, the present work aims to use an environmental protection methodology based on the calculation of absorbed dose rate in biota. Thus, selected target organism was the Tilapia fish (Tilapia nilotica, Linnaeus, 1758) and the radionuclides were: uranium (U-238), thorium (Th-232), radium (Ra-226 and Ra-228) and lead (Pb-210). As, in Brazil there are no radiation exposure limits adopted for biota the value proposed by the Department of Energy (DOE) of the United States of 3.5x10{sup 3} {mu}Gy y{sup -1} has been used. The derived absorbed dose rate calculated for Tilapia was 2.51x10{sup 0} {mu}Gy y{sup -1}, that is less than 0.1% of the dose limit established by DOE. The critical radionuclide was Ra-226, with 56% of the absorbed dose rate, followed by U-238 with 34% and Th-232 with 9%. This value of 0.1% of the limit allows to state that, in the operational conditions analyzed, natural radionuclides domore » not represent a radiological problem to biota.« less

Authors:
 [1];  [2];  [3];  [2];  [4]
  1. Coordenacao de Protecao Radiologica, Unidade de Tratamento de Minerios, Caixa Postal 961, CEP 37701-970, Pocos de Caldas, MG, BR Industrias Nucleares do Brasil (Brazil)
  2. (Brazil)
  3. Universidade Federal Fluminense, Programa de Pos-graduacao em Biologia Marinha (Brazil)
  4. Coordenacao de Protecao Radiologica, Unidade de Concentrado de Uranio. Caixa Postal 7, CEP 46.400-000 Caetite, Bahia, Brasil Industrias Nucleares do Brasil (Brazil)
Publication Date:
OSTI Identifier:
21152481
Resource Type:
Journal Article
Resource Relation:
Journal Name: AIP Conference Proceedings; Journal Volume: 1034; Journal Issue: 1; Conference: NRE-VIII: 8. International symposium on the natural radiation environment, Buzios, RJ (Brazil), 7-12 Oct 2007; Other Information: DOI: 10.1063/1.2991252; (c) 2008 American Institute of Physics; Country of input: International Atomic Energy Agency (IAEA)
Country of Publication:
United States
Language:
English
Subject:
54 ENVIRONMENTAL SCIENCES; 61 RADIATION PROTECTION AND DOSIMETRY; BRAZIL; DOSE LIMITS; ECOLOGY; ENVIRONMENTAL IMPACTS; ENVIRONMENTAL PROTECTION; FISHES; INTAKE; LEAD 210; MINING; NATURAL RADIOACTIVITY; RADIATION DOSES; RADIUM 226; RADIUM 228; THORIUM 232; URANIUM 238

Citation Formats

Pereira, Wagner de S, Universidade Federal Fluminense, Programa de Pos-graduacao em Biologia Marinha, Kelecom, Alphonse, Universidade Federal Fluminense, Programa de Pos-graduacao em Ciencia Ambiental, Instituto de Geociencias, av. Litoranea s/no, Boa Viagem, 24210-340 Niteroi, RJ Caixa Postal 107.092, CEP 24360-970, Niteroi, RJ, and Azevedo Py Junior, Delcy de. Absorbed Dose Rate Due to Intake of Natural Radionuclides by Tilapia Fish (Tilapia nilotica,Linnaeus, 1758) Estimated Near Uranium Mining at Caetite, Bahia, Brazil. United States: N. p., 2008. Web. doi:10.1063/1.2991252.
Pereira, Wagner de S, Universidade Federal Fluminense, Programa de Pos-graduacao em Biologia Marinha, Kelecom, Alphonse, Universidade Federal Fluminense, Programa de Pos-graduacao em Ciencia Ambiental, Instituto de Geociencias, av. Litoranea s/no, Boa Viagem, 24210-340 Niteroi, RJ Caixa Postal 107.092, CEP 24360-970, Niteroi, RJ, & Azevedo Py Junior, Delcy de. Absorbed Dose Rate Due to Intake of Natural Radionuclides by Tilapia Fish (Tilapia nilotica,Linnaeus, 1758) Estimated Near Uranium Mining at Caetite, Bahia, Brazil. United States. doi:10.1063/1.2991252.
Pereira, Wagner de S, Universidade Federal Fluminense, Programa de Pos-graduacao em Biologia Marinha, Kelecom, Alphonse, Universidade Federal Fluminense, Programa de Pos-graduacao em Ciencia Ambiental, Instituto de Geociencias, av. Litoranea s/no, Boa Viagem, 24210-340 Niteroi, RJ Caixa Postal 107.092, CEP 24360-970, Niteroi, RJ, and Azevedo Py Junior, Delcy de. Thu . "Absorbed Dose Rate Due to Intake of Natural Radionuclides by Tilapia Fish (Tilapia nilotica,Linnaeus, 1758) Estimated Near Uranium Mining at Caetite, Bahia, Brazil". United States. doi:10.1063/1.2991252.
@article{osti_21152481,
title = {Absorbed Dose Rate Due to Intake of Natural Radionuclides by Tilapia Fish (Tilapia nilotica,Linnaeus, 1758) Estimated Near Uranium Mining at Caetite, Bahia, Brazil},
author = {Pereira, Wagner de S and Universidade Federal Fluminense, Programa de Pos-graduacao em Biologia Marinha and Kelecom, Alphonse and Universidade Federal Fluminense, Programa de Pos-graduacao em Ciencia Ambiental, Instituto de Geociencias, av. Litoranea s/no, Boa Viagem, 24210-340 Niteroi, RJ Caixa Postal 107.092, CEP 24360-970, Niteroi, RJ and Azevedo Py Junior, Delcy de},
abstractNote = {The uranium mining at Caetite (Uranium Concentrate Unit--URA) is in its operational phase. Aiming to estimate the radiological environmental impact of the URA, a monitoring program is underway. In order to preserve the biota of the deleterious effects from radiation and to act in a pro-active way as expected from a licensing body, the present work aims to use an environmental protection methodology based on the calculation of absorbed dose rate in biota. Thus, selected target organism was the Tilapia fish (Tilapia nilotica, Linnaeus, 1758) and the radionuclides were: uranium (U-238), thorium (Th-232), radium (Ra-226 and Ra-228) and lead (Pb-210). As, in Brazil there are no radiation exposure limits adopted for biota the value proposed by the Department of Energy (DOE) of the United States of 3.5x10{sup 3} {mu}Gy y{sup -1} has been used. The derived absorbed dose rate calculated for Tilapia was 2.51x10{sup 0} {mu}Gy y{sup -1}, that is less than 0.1% of the dose limit established by DOE. The critical radionuclide was Ra-226, with 56% of the absorbed dose rate, followed by U-238 with 34% and Th-232 with 9%. This value of 0.1% of the limit allows to state that, in the operational conditions analyzed, natural radionuclides do not represent a radiological problem to biota.},
doi = {10.1063/1.2991252},
journal = {AIP Conference Proceedings},
number = 1,
volume = 1034,
place = {United States},
year = {Thu Aug 07 00:00:00 EDT 2008},
month = {Thu Aug 07 00:00:00 EDT 2008}
}