5.
GEORGE SHOT!
a,
The expected yield of the "GEORGE" shot was so great that extremely
favorable fall-out conditions were required by CUTF<3 in order to avoid any possibility of mass evacuation of personnel from the atoll.
Because of this requirement,
RadSafe planning criteria for favorable fall-out peltcrns were set up well in advaric ©
of "GEORGE"! day.
Favorable fall-out pattcrns were designated as (1) MOST FAVORABLE,
(2) FAVORADLE and (3) CONDITIONALLY F..voiaBLa.
These were integrated with the re-
sultant upper wind plots in the same way that was done on "EASY" shot.
rom experi-~
ence it was found that the trend of the upper wind plots was of greater importance
for firm operational decisions than actual forecasts of specific winds al specific
levels.
b,
As a result of the technique of observing trends of the resultant winds,
it appeared at H minus 30 hours (the time for critical decision by the Commander)
that of the three criteria for favorable fall-out, the MOST FAVORABLE pattern would
be valid, and evacuation of personnel from the atoll ceased to be an important plan~
ning consideration,
This favorable trend persisted longer than usual because of a
typhoon (JOAN) which hovered about, 150 miles northwest of ENIW@TOK ATOLL, moving very
Slowly north-northwest.
The immediate result of this distrubance was a prolonged
northeastward movement of all air above the wero point.
c.
Heavy fall-out was predicted to be in a fifty mile sector
085° true from zero point.
bearing 015°
Delayed fall-out (i.c., 1.5 - 4.0) hours after H hour
was predicted to occur within the same bearings at
radial distance of 30 to 120 miles
The mushroom was forecast to reach great heights (i.c., above 50,000
fest) and was
forecast to move southeast,
|
d.
As had been forceast, practically no fall-out
occurred on any of the
atoll islands.
Some contamination on adjacent islands ean bo
attributed to direct
blast of particular matter,
resumed at H plus 3 hours,
With practically no fall-out, normal operations
were
Exclusion areas after the shot were limited to islan
ds
clase to zero point, plus some islands
with residual contamination from "DOG"
and
NRASY" shots,
&.
kadSafe phases, in general, were normal,
Some contaminated witer, up
to one mile from the lagoon side of the
atoll, was found near sero point isla
nds of
the EBERIRU GROUP but this did not
hamper post-shot operations,
"ITEM SHOTH
Again,experience from other detonati
ons of Operation GREENHOUSE was
ay
ae
aes,
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