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Effective dose rate evaluation from natural gamma radiation in the region of Ribeirao Preto, SP-Brazil

Published online by Cambridge University Press:  09 January 2012

J. Barescut ,
D. Lariviere ,
T. Stocki ,
F. Cavalcante ,
N.C. Silva ,
H.L.C. Alberti  and
A. De Almeida
F. Cavalcante
Affiliation:
Departamento de Física, Universidade de São Paulo, Ribeirão Preto, Avenida dos Bandeirantes, 14040-901, Brazil
N.C. Silva
Affiliation:
Comissão Nacional de Energia Nuclear – CNEN, Laboratório de Poços de Caldas, Poços de Caldas, 37701-970, Brazil
H.L.C. Alberti
Affiliation:
Comissão Nacional de Energia Nuclear – CNEN, Laboratório de Poços de Caldas, Poços de Caldas, 37701-970, Brazil
A. De Almeida
Affiliation:
Departamento de Física, Universidade de São Paulo, Ribeirão Preto, Avenida dos Bandeirantes, 14040-901, Brazil
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Abstract

Assessments of natural gamma radiation were done for urban sites in the city of Ribeirão Preto – SP – Brazil, allowing to infer the average annual effective dose value for the population in these areas. The measurements were done using a vehicle with a mobile radioactivity measurement system, Eberline, with a plastic scintillation detector and a Global Position System (GPS), to collect measurements of gamma dose rate and its spatial distribution. Using the national census information, the stored data allowed mapping the radiometric measurements through the ArcGIS software, correlating the geographical coordinates with their respective dose rates. These maps illustrate how effective dose values are distributed within the selected areas and also correlate the collective dose values for these populations. Around 45,000 georeferenced effective dose values, ranging from 12.2 up to 59.8 nSv/h raised an average value of 0.034 ± 0.004 mSv/year, which is less than the worldwide average effective dose value of 0.07 mSv/year [12] (for outdoor exposures from terrestrial radiation sources) and less than the previous average values found in Brazil for the regions of Poços de Caldas, Guarapari, Andradas, Caldas and Meaípe [2,10].

Type
Research Article
Information
Radioprotection , Volume 46 , Issue 6: ICRER 2011 – International Conference on Radioecology & Environmental Radioactivity: Environment & Nuclear Renaissance , 2011 , pp. S145 - S150
Copyright
© Owned by the authors, published by EDP Sciences, 2011

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References

Sabol J., Weng P.-S., Introduction to Radiation Protection and Dosimetry (World Scientific, Singapore, 1995) pp. 130-160.
Sachett I.A., “Caracterização da Radiação Gama Ambiental em Áreas Urbanas Utilizando uma Unidade Móvel de Rastreamento”, Doctoral Thesis, Instituto de Biologia Roberto Alcântara Gomes, UERJ, Rio de Janeiro, RJ, Brazil, 2002.
Conti C.C., “Medida de Kerma no Ar e Determinação de Coeficientes de Conversão para Dose Devido à Radiação Gama Ambiental”, Master Thesis, COPPE/UFRJ, Rio de Janeiro, Brazil, 1999.
Alencar A.S., Freitas A.C., Radiat Meas, 40 (2005)
Grasty R.L., LaMarre J.R., Radiat Prot Dosimetry, 108 (2004) 215-226
Saghatchi F., Salouti M., Eslami A., Sharafi A., Radiat Prot Dosimetry, 141 (2010)
Papp Z., Radiat Prot Dosim,141 (2010)
Carneiro J.C.G.G., Betti F., Sanches M.P., Sordi G.M.A.A., Pecequilo B.R.S., “Contribution of Natural Background Radiation to Annual Effective Dose in Different Areas of São Paulo City”, 12th International Congress of the International Radiation Protection Association, Buenos Aires – Argentina, 19–24 October, 2008.
Yoshimura E.M., Umisedo N.K., Okuno E., Nucl. Instrum. Meth., 487 (2002) 457-464
Silva N.C., Macacini J.F., Alberti H.L.C., “Geoprocessing as a Technical Tool for Radiological Assessment in the Urban Area of Poços de Caldas, MG”, 2009 International Nuclear Atlantic Conference, Rio de Janeiro – Brazil, Septemper 27–October 2, 2009.
Taskin H., Karavus M., Topuzoglu A., Hidiroglu S., Karahan G., J Environ Radioactiv, 100 (2009)
UNSCEAR, United Nations Scientific Committee on Effects of Atomic Radiation, Sources and Effects of Ionizing Radiation, Report to the General Assembly with Scientific Annexes, New York: United Nations (2008)
http://www.brasil.gov.br, accessed on may/2011
Barretto P.M.C., Austerlitz C., Malheiros T. and Løvborg, L., “Radioactive concrete sources at IRD/CNEN, Brazil, for the calibration of uranium exploration and environmental field instruments”, IRD/DEX-3/ CNEN, Instituto de Radioproteção e Dosimetria da Comissão Nacional de Energia Nuclear, Rio de Janeiro – Brazil, 1987.
http://www.ibge.gov.br, accessed on may/2011
Turhan S. et al, Radiat. Prot. Dosimetry, February (2011) 1–6
Cetiner M.A., Gunduz H., Ilgar A., Rad Phys Chem, 80 (2011) 704–709
UNSCEAR, United Nations Scientific Committee on Effects of Atomic Radiation, Sources, Effects and Risks of Ionizing Radiation, Report to the General Assembly with Scientific Annexes, New York: United Nations (2000)
Saito K., Petoussi-Henss N. and Zankl M., Health Phy., 74 (1998) 698-796.
CNEN, NN 3.01 Diretrizes Básicas de Proteção Radiológica da Comissão Nacional de Energia Nuclear, Rio de Janeiro, Brasil (2005)
ICRP, Recommendations of the International Commission on Radiological Protection, Publication 60, Pergamon Press, Oxford, 1991