eectae
thes Bt a
15
Measurable amounts of radioactive materials were found in
the water at each station sampled.
In general,
ern part of the area had the lowest values.
the northwest-
The highest read-
ings were from station 9D near the northwestern edge of Bikini
Atoll.
The surface samples had a higher average value for total
radioactivity, 10,000 d/mAl, than samples from other depths.
This value is the average of the sums of the radioactivity of
the residue on the filter paper and that in the filterable portion.
Water samples obtained from the 100-meter depth had
dade
the lowest average radioactive content, 3,900 d/m/l.
The distribution of the radiation in the water at the
depths sampled is illustrated in Figures 12 to 16.
The highest
radiation levels for each depth sampled were at station 9D,
mediately north of Bikini Atoll.
im-
A second area of concentration
was found in a limited region north and west of Eniwetok Atoll.
In only the surface samples did the particulate matter re-
APh
PSSe
tained on the filter paper have a greater radioactive content
than the filterable fraction (Table 3).
In the surface samples
sixty per cent of the activity was recovered in the carbonate
precipitate.
In samples obtained from the 25, 50, 75 and 100-
meter depths, most of the radiation passed through the filter
paper,
indicating that it was in solution.
While radioactive materials were found at all sampling
5
i
the area under study suggests that the regions of greatest con-
?
tamination were included in the survey.
Stations the decline of the amounts found around the edge of
UNIVERSIT. for,
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