Contribuição para o mapeamento da radioatividade natural no Brasil – exposição externa

Krause Cristina Silva Salles, Elaine Rua Rodriguez Rochedo, João Claudio Batista Fiel, Maria Angélica Vergara Wasserman


Exposure to natural radiation is the main source of exposure for the world's population. The objective of this work is to make external dose estimates to the Brazilian population resulting from this exposure. For the calculation of effective doses, the models used by the United Nations Scientific Committee for the Effects of Atomic Radiation (UNSCEAR) were used. In relation to cosmic radiation, sea level exposure was considered as a function of the latitude, corrected for the altitude of the selected sites, which comprise Brazilian municipalities with a population greater than 100,000 inhabitants, which includes 53% of the country's population and at least one city in each state. For the calculation of terrestrial radiation, sites were limited to those for which there are information on dose rate or concentration measurements of natural radionuclides in the soil. These sites comprise only 21% of the country's population. The results for exposure to cosmic radiation are similar to those estimated by UNSCEAR as world averages. The results for the exposure to terrestrial radiation are much higher than that indicated as world average. This result may reflect the preference for radioecological studies in areas of high natural background radiation.


Natural background radiation; Public exposure.



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