Abstract
Radiostrontium and radiobarium data in rain obtained in this laboratory indicate that (a) the radioisotopes injected into the troposphere generally travel eastward and circle the earth a number of times before being completely washed out by rain, and (b) the 90Sr inventory in the northern stratosphere appears to have decreased during the past several years at a rate corresponding to the stratospheric mean residence time of 1.1 yr. The paths of the radioisotopes injected into the lower atmosphere were traced by 300 mb and 500 mb air trajectories. During a period of two to three tropospheric mean residence times (60–90 days), the fallout particles seem to circle the earth three to four times. In calculating the stratospheric mean residence time, corrections were applied for the fresh injections of 90Sr into the atmosphere by the Chinese nuclear explosions.
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