Seasonal Variations in 7Be Radioactivity Measured at Ground Level

Details Seasonal Variations in 7Be Radioactivity Measured at Ground Level Seasonal Variations in 7Be Radioactivity Measured at Ground Level

Jul 2003

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2003icrc....7.4217y&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

7 Be radioactive nuclei with a half-life of 53.3 days result from spallation reactions of galactic cosmic rays and solar energetic particles with N and O nuclei in the Earth's atmosphere. The ground-level measurement of 7 Be radioactivity in 2002-2003 shows seasonal variations which are enhanced in spring and fall seasons. In addition, 210 Pb radioactivity which is of terrestrial origin exhibits a similar trend of temporal variations. The variations are due to not the solar activity but the atmospheric effect. We discuss the possibility of the air mass mixing between the stratosphere anf trop osphere to explain the measured seasonal variations.

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