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Brigadier Generel ‘lfrad D, Starbird
TEWA shot was a water surface detonation over shallow water (mexi-
run depth of water 60 feet under the detonetion berge), had a yield of
5 i eneiiiiel 4s can be seen in the TEWA table of
inclosure l,
6 is e strong indication of an increased strontiuz-90
content collected at stations distant from ground zero. There is an
exception, & hich reeding et "HOW" collection stetion only 10 riles
fron ground zero.
This stetion is well within the erea covered by the
originsl groith of the Lusiroom, Diffusicn hed probably not yet exerted
ary effect upon the mushroom end purely local phenozenon could have
bicsed the collection et this etetion, Certainly no clecr-cut picture
°
of large-sezle fractionation in favor of strontiun-99 was observed at
the distent steticns. If one cen ignore "HOW" stetion, not nore then
twice the erount wes found ct eny stetion beyond 10 riles.
no evident fractioneztion, with distance, for zirconiur-95.
sure 1, teble l.
NAVAJO was a weter surfece sho
16
water (215~fcot depth),
There was
See inclo-
2
fission. This shot, es skoin in inclosure 1, res
in no aprerent
frectioneticn of strontium-~-90, with distances es greet as 42 niles
from ground zero, The increcse of strontiun-90, elthough slight, was
found in close at collection stetions ebout 7 miles from ground zero.
There was no frectionstion of zirconiun-95 epperent with distence. See
iuclesure 1, teble IT.
ZUNI wes a land surfeca shot with a yield of 3.5 MT. ;
wes docunented at stations rensing fron &.5 to & miles fron sround
sero.
The resulte (inclosure 1) of this leni surfece burst indicate
frectionstion of strontiun-90,
Approximately 4 to 8 tires the quin-
tity of strcontiur-99 wes observed et the distent ststions es wes
observed at the close-in stations, The preceding coxparison is besed
on an cverece value of strontiuc~-90 for the close-in ststicns, This
fractionaticn was not apparent at ZUNI for another redionuclide zirconium-95 studied in the same menner, See inclosure 1, tehle ITI.
‘
FLATT sD was a device detonsted on a barge on the surfacs of the
Bikini Levoon
wespon wes 114 feet.
The
A large exount of iron and
were ‘ncorporeted in the tergé, sufficient exounts to confuse the
|
.
expected fell-out results. This shot wes docunented et stations fran
5.1 to 45 miles from ground cero (inelesure 1). £ very epperent freetionstion of strent fur-90 at the 57 mile stetion did not hold true at
enother stction farther out.
This rost distant station did chow sone
fractionation of strontiuz-90, hovever, very cuch-less pronounceé then
the 37 mile ststion. No indication of frectionation with distence is
SS