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ST 2.1 –
Radiación natural, NORM y TENORM
A SIMPLE MODEL TO ESTIMATE RADIATION DOSES TO AIRCREW
DURING AIR FLIGHTS IN BRAZIL AND ABROAD
Heilbron, Paulo
1
*; Guerrero, Jesus
1
; Heilbron, Rafael
2
; Amaral, Mario
2
1
CNEN. Brasil.
2
PUC. Brasil.
* Responsible author, email: paulo@cnen.gov.br
The objective of this article is to present the results obtained from the development of a simple
model to estimate cosmic radiation doses from crew members taking into consideration the
variation of the dose rates with the altitude and the latitude, airplane cruse velocity and other
important parameters such as cruise height, takeoff time, landing time, takeoff angle, landing
angle. The first Brazilian program for doses estimation was developed using the “mathematica”
symbolic software and the data used to calculate the dose rates with altitude and latitude by the
authors were based on the mean solar activity from January 1958 to December 2008 (51
years). In order to test the program three Brazilian flights were simulated by the program and
the results compared with the doses measurements obtained by a professor from the Military
Institute of Engineering using a radiation detector during these flights. Some international
American flights were also simulated in the program and the results compared with other works
found in literature. The program gives excellent results for the doses expected for the air
crewmembers of the three national flights (between capitals cities in Brazil) when compared with
the doses values calculated based on the radiation levels measured directly inside those flights.
According to the results the doses expected for the Brazilian crews of domestic flights can, in
some cases, depending on the number of annual flights, overcome the limit of 1 mSv/year
established by the Brazilian competent authority in Brazil (Brazilian Nuclear Energy
Commission- CNEN) for public annual exposure. In the case of the simulated international
flights the results shows a good agreement with the results found in literature especially when
considered the different database series used by the authors and by the other references for the
solar activity.