mechanicvm, aescends into the troposphe wes
the tropospheric
WG
moisture rroceeds to clean it uy.
Fo “
On thi. mcdei, we see that
submicron faiiouc particies, weather pnenomena are controliing
and thet tne bembs which nave insufficient energy to puch their
fireballs above the tropopause will have their world-wide failout brought down in caindrops in a matter cf about one month
on the average, in extreme contrast with the stratospheric
th
cars alo t foc years on the average.
material which apparently sea:
The contrast between teal
chese two Ll
es meens thet the
concentration of radioactive falinut in the stratospneric ai
in terms of equal denzities of eins is -tlways, much
tropospheric air.
heon experimentally cboerved to be
true.
Data from measurements meade
Fig..
“ the suvface as given in
ast
1 to 5 inciucive ar2 caicuzated from surface air filter
measurements made by tne Navel Radioioxsical Defense Laboratory
i
F igs. 1 and 2 present the mixed fission product data and
Figs. 3, 4, and 5 sive data ortaines by analysi
oz the filters
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