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Radiation Protection Dosimetry Advance Access originally published online on November 16, 2004
Radiation Protection Dosimetry 2004 112(3):331-343; doi:10.1093/rpd/nch418
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Radiation Protection Dosimetry Vol. 112, No. 3 © Oxford University Press 2004; all rights reserved

Monte Carlo calculation of the angular distribution of cosmic rays at flight altitudes

G. Battistoni1, A. Ferrari2, M. Pelliccioni3 and R. Villari3,*

1 INFN, Sezione di Milano, via Celoria 16, 20133 Milano, Italy
2 CERN, 1211 Geneva 23, Switzerland and INFN, Sezione di Milano, via Celoria 16, 20133 Milano, Italy
3 INFN, Laboratori Nazionali di Frascati, 00044 Frascati, Italy

* Corresponding author: villari{at}frascati.enea.it

The angular distribution of the secondary radiation produced by the galactic component of cosmic rays has been determined by simulating the penetration of the primary spectra in the Earth's atmosphere. The simulations have been carried out with the latest version of the FLUKA code. Particles have been scored at various altitudes according to their angle of incidence for some significant values of vertical cut-off rigidity and solar modulation parameter. The calculated results at typical cruise altitudes for a civil aircraft are presented. The data at 10.7 km have been fitted with simple mathematical equations. It has been demonstrated that the major contribution to the doses at aviation altitudes arises from downward-directed particles. The isotropic irradiation usually assumed for the evaluation of aircrew exposure could be a very poor approximation.


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