The highest assent of radicactivity in the area studied
is on the ocearytloor in the region of CASTLE fallout,
The
Lagoon tested 29,500 cpm/gri33 sediment from the northwest end
of the lagoon emitted 45,000 cpm/g.
BRAVO event at CASTLE.
Presumably both were from
Elsewhere in the lagoon, the bottom
sediment generally emitted from 1500 to 4000 cpm/g compared
with a usval 1000 to 3000 crm/zg in the fallout area outside
the lagoon.
Sampling of bottom living organisms outside the lagoon is,
so far, unsuccessful.
Bottom dwelling organisms in Allinginae
and Bikini Lagoons (particularly the latter) were quite radioactive.
Other lagoons were not studied.
‘The mclluses displayed ~
the highest activity and this was outstandingly concentrated
in the livers and kidneys (52,000 to 84,000 gamma cpm/g).
In the open sea area, measurements of currents verified
the general circulation obtained at CROSSROADS and py Japanese
cruises, but more explicit information was cbtained.
Meander-
ings and eddies dominate the flow in the latitude of Dikini;
the main flow westward is located at the north side of the PPG.
A large, counterclockwise-revolving eddy at Bikini is fcund down
to depths of at least 500 meters.
The current at the surface
attains 0.6 to 0.7 knot speed and averages 0.3 to 0.4 knot;
thence it decreases to a maximum of 0.3 knot and average of
O.15 knot at 500 meters depth.
The thickness of the wind stirred layer above the thermociine,
where tenperature decreases rapidly, varies from 40 meters near
Bikini to 170 meters in the northwestern part of the area.
The
ye
spi0ok ,
cor RG”
a eee ae
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ET
EeeeeR
PO ne wind
top of cne deep sea core taken 10 miles northwest of Bikini