高層大気中における放射性核種の挙動について (II)
中国核実験 (13回～16回) における放射性塵中の核種の変動
1979 年 14 巻 1 号 p. 31-37
詳細
1979 年 14 巻 1 号 p. 31-37
Measurements of the radioactivity and the analysis of nuclides in a fresh airborne dusts have been made for Chinese nuclear explosion test during 1972-1974.
Samples were collected on filter paper with a dust sampler mounted on an aircraft at high altitude over Japan. It was observed that the airborne dusts reached Japan in 1-3 days after the bursts, and its effect is temporary in most cases.
The level of the gross beta-activity of fresh airborne dusts increase after tests, but the concentrations of 90Sr and 137Cs do not very markedly.
