ri
2
ct is to ve reca_.ed tnat a <sousjh averase fi,ure
£
for ine
stvatospneric Lavertocy it 354 Gisintecatiows yer miiuce per
lJvJ standard cubic foot of air, and various, evidence inaicatec
chat the filter efficiency may be 45%.
Tain, these cough
numbers one then woul: deduce that the Vtzontium-95 content of
the stratosphere average. about2JU divinte;rsations per minute
per LjJgJ stancard cubic feet in the eazly part of 1956 and
late 1957.
This number which ag-vees very wel. with the
theoretical:y calculated ctratospheric inventory given in
Figure 6.
Turning now, again, to tue surface air concentration
data taken by the Naval Radiolo;icai Defence Laboratory and
quotec eaclies in Tabie I which ,ave a mean curface concertzaciou of about
.3 disinte.rations pe’ minute ser 190) cubic feet
we make a direct compazicon between cine ob-esved mean veciderce
time of avout three days and the cctratospne.ic time. Murtipiying
surface Jives the steatospnecic vesicer.ce time.
This sesut
Cr
tigee Gaye by the vatxio of ZJ5 to .3 the mean va.ue at tue
is
5.5 years, agveein. Wicn the two previour vasuec.
Tukinzg all of these different lines of evidence into account
ai:d notin; the Veierai azgceement with obv-e-svatioi., we conc_uce
that the cimp.e mocel pvoposed eazliex cti.i i. Likely to be
corzect in many vecpectic.
Ts vecourc, it ways that materziai
auccoduced into the stvatotpnere ic mixed cagicaiy verzticai_y
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