Página 524 - irpa

524 ST 6.3 – Protección radiológica del público y el ambiente
ASSESSING PUBLIC AND CREW EXPOSURE IN COMMERCIAL
FLIGHTS IN BRAZIL
de Abreu Alves, Vanusa1 ; Rua Rodriguez Rochedo, Elaine2 ;
Neves Gomes da Silva, Diogo3*
1 Instituto Militar de Engenharia (IME). Brasil.
2 Instituto de Radioproteção e Dosimetria (IRD/CNEN). Brasil.
3 Universidade Federal do Rio de Janeiro (UFRJ). Brasil.
* Responsible author, email: dneves@biof.ufrj.br
The exposure to cosmic radiation in aircraft travel is significantly higher than at ground level and
varies with the route due to the effect of latitude, the altitude of flight, the flight time, and the
year according to the solar cycle effects in galactic cosmic ray flux. The computer program
CARI-6, developed by the U.S. Federal Aviation Administration, calculates the effective dose of
galactic cosmic radiation received by an individual in an aircraft flying the shortest route
between two airports of the world. The program takes into account changes in altitude and
geographic location during the course of a flight. The aim of this project is to estimate the
contribution of cosmic radiation exposure on commercial flights to the Brazilian population. A
database, including about 4000 domestic flights in Brazil, was implemented in Excel
spreadsheets based on data flights information for November 2011. Main fields included on the
database are the origin and destination of flights, time of departure and arrival, plane type,
number of passengers, flight times (take-off, landing and cruse altitude times) and number of
flights per year. This information was used to estimate individual and collective doses for crew
and passengers. Doses for domestic flights in Brazil range from 1.8 to 8.8 µSv. Considering the
occupational limit of 850 h of flight per year for crew members and numbers of flights for each
route, average occupational dose would be about 0.76 mSv/y. Collective doses, for the total
number of flights per year and airplane types were estimated to be 214 and 11 manSv/y for
passengers and crew members, respectively.