Página 138 - irpa

137 ST 2.1 – Radiación natural, NORM y TENORM
EXTERNAL DOSE RATES IN COASTAL URBAN ENVIRONMENTS
IN BRASIL
Magalhaes de Souza, Elder1*; Rochedo, Elaine R.R.2 ;
Conti, Claudio C.C.3 ; Candeiro, Ricardo E.M.4
1 Instituto de radioproteção e Dosimetria. Brasil.
2 Comissão Nacional de Energia Nuclear. Brasil.
3 Instituto de Radioproteção e Dosimetria: Brasil.
4 Comissão Nacional de Energia Nuclear – DIFOR. Brasil.
* Responsible author, email: eldermagalhaes@gmail.com
Along term activity aiming on assessing the exposure of the Brazilian population to natural
background radiation is being developed at IRD/CNEN. Several research groups within IRD work
in this activity, although mostly as a parallel work associated to main research lines followed by
researches of the institution. One main activity is related to the raise of external gamma dose rates
throughout the country. The objective of this work is to present results from recent surveys
performed as part of the emergency preparedness for radiological emergencies during major
public events in Brazil, such as the World Youth Day, held in Rio de Janeiro in 2013, and the
Confederations Cup and the FIFA World Cup soccer games, in 2013 and 2014, respectively. In
this work, only the recent (2014) coastal urban environments measurements were included.
Average kerma rates for Fortaleza is 80 ± 23nGy/h, for Vitoria is 96 ± 33 nGy/hand for Angra dos
Reis is 147 ± 16nGy/h. These results are then compared to previous results on other coastal
urban towns (Rio de Janeiro, Niterói and Salvador), and with the high background coastal area
of Guarapari town.