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woich, as you eee,
fail somewhat ii.cermediate pvetween cue tivo
theories, pernaps more ciosely fittin, the old theory, particularly insofar as the ctrontium-v9, wtsrontium-95 values are
concerned.
‘t the present time it does not seem to be possitie
tc decide definitely betweer. the two alternatives, thou, the
next few montis wnoura yive us auequate aata to distinguish
between them.
Ii: ordes to tetter delineate ana understand the mechanism
by woich stratospneric fallout occurs the Atomic Energy Commission
adued the isotoses curjsten-id5 and chodium-1JZ to some of tiie
nucteac devices expisdea in the Harstack Series last summer.
Tunysten-165 with a haif-iife of /4 dayz was produced in a uumber
of detonationc over ciiica sand.
Unueviying the etudy of
cun,sten-iu05 is tne hope that by decerminii., the contribution
rh
of
a single equatociai test series ir a.t part. of tne world it
would become possible to cictinjuicn amon, the differert models
which have been propoceu:
stcatospheric mateviai ic
(1) the one ty the author ir wnich the
assumed to mix uniformly over tne world
and then fail out at a rate corresponaing to a seciaernce time
ae
of 5 to i3 years ox something intermediate to be determined;
(2) the one by Ds. Machta and Mr. Stewart which ways that the
mixing in che stratosphere is aiso uniform but that the fai_out
fxom tne stratospnere occurs mainey at about 4J°N Latitude where
the polav tropopauce ineets the equatorial tropoyauce and for
a
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