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STATISTICAL ANALYSIS APPLIED TO RADON AND NATURAL EVENTS

*H. Climent, *S. Tokonami, *M. Furukawa
*Human Radiation Environment Division
National Institute of Radiological Sciences
4-9-1 Anagawa, Inage, Chiba 263-8555, Japan
Phone: +81-43-206-3105, Fax: +81-43-284-1769
e-mail: helene@nirs.go.jp

Soil radon concentrations together with climatic and seismic data were continuously observed in the
Kanto area (Japan). During fall 1998, several typhoons and earthquakes occurred. In the meanwhile,
continuous measurements of the following parameters were carried out: air pressure, temperature in
the air and in the soil, humidity in the soil, wind speeds, wind direction, rainfall and earthquakes
magnitudes.
Data were analyzed using time-series analysis method, i.e. Correlation and Spectrum Analysis, so as
to point out the possible relationship between radon and an environmental variable. While some
correlations appeared between radon concentrations and typhoon data, no relationship was found
concerning radon and earthquakes.
Keywords: Radon, Statistical Analysis, Typhoon, Earthquake, Transport, Soil.