Radioactive Contamination in the Upper Atmosphere

Abstract

Although numerous measurements have been made on the radioactive contamination near sea level, our knowledge of the contamination of radioactive dusts in the upper atmosphere is still very imperfect. “Radioactivitysonde ”, which is the combination of balloon-borne instruments and telemetering technics, is utilized for the radioactivity measurements. Our measurements have been made 18 times from 1957 to 1959 at the Aerological Observatory, Tateno, about 50 km northeast of Tokyo (36°03'N 140°08'E).