The Sr-90 Fallout and the Air Motion
1959 Volume 9 Issue 3-4 Pages 172-176
Details
1959 Volume 9 Issue 3-4 Pages 172-176
The cumulative amount of S r - 9 0 in Tokyo through the middle of 1958 reached 11.3 mc/km2. The fall rate of Sr-90 has the positive correlation of +0.69 with the rainfall amount but it has no s p ring maximum as suggested by MACHTA et al. The estimated amoun t of fallout in the future will be about 50 mc/km2 even if nuclear tests sto p now. The average age of fallout which is calculated from the ra t i o of Sr-89 and Sr-90 was from 200 to 300 days. The difference betw e e n the atmospheric ozone and the Sr-90 in the stratosphere is dis c u s s ed. It is concluded that the radioactive deposit on the earth is affected by locations and seasons of injection of Sr-90 into the stratosphere as well as the turbulent motion on a larger scale.
