Physics
Scientific paper
Jul 2003
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2003icrc....7.4291z&link_type=abstract
Proceedings of the 28th International Cosmic Ray Conference. July 31-August 7, 2003. Trukuba, Japan. Under the auspices of the I
Physics
Scientific paper
The intensity and composition of cosmic radiation at atmosphere altitudes up to 30 km o.s.l. are modulated by solar activity and strongly depend on geophysical characteristics and atmosphere parameters. An accurate evaluation of secondary neutron energy spectra may constitute a valuable contribution to a better knowledge of the primary cosmic ray intensity. Moreover, because of neutron high Relative Biological Effectiveness (RBE), a correct assessment of the neutron component allows an improved estimate of the risk associated to a human exposure to ionizing radiation arising from cosmic rays. In addition, neutron intensity and energy distribution is strictly correlated to atmospheric composition. In this work the results of different experiments, concerning neutron integral and differential measurements at various altitudes and latitudes, are presented. Introduction The radiation environment around the Earth is due to the interaction of primary galactic cosmic rays (GCR) with nuclei constituting the atmosphere. Primary particles, entering into the upper layers of the atmosphere mainly interact with Oxygen and Nitrogen nuclei and produce a secondary shower, consisting of different particles such as protons, neutrons and mesons. The secondary particle production is balanced by absorption in air and leads to a variation of ionizing particle flux with altitude. The secondary shower characteristics depends on geophysical coordinates, solar activity and atmosphere composition. Recently the possible role of cosmic ray intensity variation in the present global warming has also been considered. In fact observations by satellite suggest that cosmic rays play an important role in the climate, showing a correlation between cosmic ray
DeAgostini S.
Durisi E.
Fasolo F.
Ongaro C.
Pelliccioni M.
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