€, *
re
and ca:culatea as waces of strontium-95 fFaiiout.
The caicu:za-
mn
tior. of fallout sates from the air fiiter data was madd vy
acsumia.,; the mean :esidence time in the Lowec atmosphere to be
three days.
Ten thoucand feet ic estimates to se the avevaze
thickness of the aiv tying beiow the catu ovigin.
The opservec
fallout rate in Pictzoucgn for tne same period of time checks
very weli with the calculated rate for Washington, D. C., from
the aix filter data.
Tabie I, and II give the cesuléz: of similar caicutations for
The cheoretica:
va: ues ave those caicuiated
<
is
various latitudes.
Fe
&
both mixed fission products and air £ Ltes strontium-9., data for
from the model, assumiu, the avesase trogocpheric resiserce time
of one month ard of the stratospheric materia. ten yeas.
The mean average coucentration in the Lower atmosphere durin,
the Last montnc of 195/ and the first few months of 1956 was
apout i aicinte sation pes minute pes 1j0 standard cubic meters
or 3.25 per stanaaia cuvic foot in the Northern Hemisphere.
At
chis time tne content of che nines troposphere would have veen
rs
‘
Joe
Q
Minute pes tno..and xtandacd cub
ox 3 to 4 cicintegrations per
oO
expected to be about 15 times this
c
.
feec.
¢
a
s
ae
This wouid be expected
or air juct be-ow the tropopause in the hi:ner Levels of che
tropospnere.
vie umuerstana the broad probiemc of the residei.ce time ana
che scavensit., mechanicm for the troposphese.
In brief, falsout