The Measurement and Behavior of Airborne Radionuclides Since 1962

Time Variations of Artificial Radionuclide Concentrations in the Air over Japan since 1974

“…The analyses revealed that the debris of the 21st nuclear test mostly contributed to the stratospheric inventory and stratospheric residence time was about 1 year in agreement with the results of other studies [1,2]. Tropospheric residence times were obtained by analysing the results of small scale nuclear tests, and they varied considerably from 7 to 20 days.…”

Describing the annual cyclic behaviour of 7Be concentrations in surface air in Oceania

“…Atmospheric processes controlling the 7 Be annual cycle reported the mean residence time of 7 Be-bearing aerosols in the troposphere to be around 3 weeks. Aerosol residence times in the stratosphere are much longer than for the troposphere and a residence half-time of the order of 1 year has been reported (Thomas et al, 1970). Because the stratospheric residence time is much longer than the 7 Be half-life, equilibrium between the rate of cosmogenic production and radioactive decay of this radionuclide is assumed to exist within the stratosphere.…”

Cosmogenic 22Na as an index of the residence time of water in freshwater basins: a review

“…The piston flow model does not give correct estimates of residence time for those studied basins in which lakes occupy (Table 1). Thomas et al (1970) a considerable part of the basin's volume. For example, if we use the data on T from Table 4 to estimate the values of T pf (by means of Fig.…”