Follow-up of the Natural Radiation Exposure from Gamma Rays in the City of Sao Paulo, Brazil

Janete Cristina Gonçalves Gaburo Carneiro, Matias Puga Sanches, Demerval Leônidas Rodrigues, Brigitte R S Pecequilo


The effective doses received by the general population from the natural radioactivity in the city of São Paulo, Brazil, were assessed from 2007 to 2013, as, apart from the variation from place to place, the background gamma levels in air are not constant in time. The outdoor gamma radiation levels were carried out with thermoluminescent dosimeters, TL, quarterly exposed, using twelve monitoring stations, covering both places frequented daily by people with emphasis in the most populated districts and outskirts areas, with no influences from man-made ionizing radiation sources. The average annual effective dose in the city of São Paulo, found as 1.3 ± 0.1 mSv, is below the annual global per caput effective dose due to natural radiation sources of 2.4 mSv and within the annual effective doses range of 1 to 3 mSv, expected to be received by 65% of major population.


gamma radiation levels, natural radiation sources, effective dose, thermoluminescent dosimetry


Carneiro, Janete C. G. G.;Betti, Flavio; Sanches, Matias P.; Sordi, Gian M. A. A.; Pecequilo, Brigitte R. S. Assessment of the Environmental Outdoor Gamma Radiation Levels in Sao Paulo City, 2010. Int. J. Low Radiation, v. 7, n. 5 -p. 359-365.

Instituto Brasileiro de Geografia e Estatística (IBGE), Avaiable at: Acessed 16 April, 2014).

Prefeitura de São Paulo, 2010. Physical and Demofraphic Data on the City of São Paulo (online) Avaiable at: Accessed 16 April, 2014.

E. M. Yoshimura, S. M. Otsubo, R.E.R. Oliveira, 2004. Gamma Ray Contribution to the Ambient Dose Rate in the City of São Paulo, Brazil. Radiation Measurements 38 (2004) 51-57.

International Commission on Radiological Protection, 1996. Conversion Coefficients for Use in Radiological Protection against External Radiation, ICRP 74 Ann. ICRP 26 (3-4) 1996.

Comissão Nacional de Energia Nuclear, 2005. Diretrizes Básicas de Proteção Radiológica (CNEN-NN-3.01), in portuguese.

International Commission Radiological Protection, 2007 Recommendations of the International Commission on Radiological Protection, (ICRP 103).

United Nations Scientific Committee on the Effects of Atomic Radiation, 2010. Sources and Effects of Ionizing Radiation, UNSCEAR 2008. REPORT Vol. I, New York.

United Nations Scientific Committee on the Effects of Atomic Radiation UNSCEAR 2000. Sources and Effects of Ionizing Radiation-Annex B, United Nations, New York.

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