Radon and Its Daughters in the Maritime Atmosphere Near Japan Islands

Abstract

In the maritime atmosphere near the land, natural radon and its daughters dispersed from land to over ocean are found gradually to attain their radioactive equilibrium with time lapse after they left land sources.
Radioactive equilibrium is found to be established at the distance 100∼150km from the land, at least in winter season. Farther off from the distance about 150km from the land, radioactive equilibrium will get deviation mode from their equilibrium state.