Abstract：
:Plutonium isotopes have primarily been injected to the stratosphere by the atmospheric nuclear weapon tests and the burn-up of the SNAP-9A satellite. Here we show by using published data that the stratospheric plutonium exponentially decreased with apparent residence time of 1.5 ± 0.5 years, and that the temporal variations of plutonium in surface air followed the stratospheric trends until the early 1980s. In the 2000s, plutonium and its isotope ratios in the atmosphere varied dynamically, and sporadic high concentrations of (239,240)Pu reported for the lower stratospheric and upper tropospheric aerosols may be due to environmental events such as the global dust outbreaks and biomass burning.
journal_name
Sci Repjournal_title
Scientific reportsauthors
Hirose K,Povinec PPdoi
10.1038/srep15707subject
Has Abstractpub_date
2015-10-28 00:00:00pages
15707issn
2045-2322pii
srep15707journal_volume
5pub_type
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