+
erty
4
c
The highest levels on the island were measured around
ur/hr.
a concrete instrument bunker near the lagoon shore.
Other
regions where high levels were found were located near the
western end over a desert-like plain and near depressions
with black algae cover.
Readings with the G-M counter in
these regions ranged from 110 to 217 pr/hr.
Soil samples were taken from two areas on the western
end where the highest levels were measured.
The analyses of
the samples indicated that the majer contributors to the
exposure rate were 5° ao, 1°98 Rh, and *25csh.
Phese three
emitters probably account for about 85% of the tctal exposure
rate, with the remainder due mostly to *°”cs (12%).
*®°° Eu,
7°leh, *°?Rh, *°°Rh, and *®Zn, were also detected (see
Figure 9).
Lukoj
- Jelete
pene
F.
These two islands in the southwest part of the atoll
are quite similar to one another.
They are small, more or
less round with black coral rock overgrown with ipomea vines
along the shore areas.
Inland the islands had very dense
vegetation.
The soil was very damp with considerable
thickness of decaying organic matter.
These islands also
had large bird populations.
Survey of these islands was generally done by circling
each island about 100 ft. inland.
Spot measurements were
made in the intericr with at least one transect across the
island through the dense vegetation.
The radiation levels on Lukoj were quite high.
On one
short transect the range was 61 to 104 ywr/hr with the
scintillation counter and 63 to 130 pr/hr with the G-M
counter.
On another transect which cut more nearly across
center of the island where the higher levels were measured.
This soil sample was analyzed on both NaI(T1) and Ge(Li)
spectrometers.
The spectra indicated that the major y-ray
emitters present were °°Co, **5sb, *°?™ph, ?°°%Eu, and **’¢cs
TP
pee os,
bo wee
the center of the island the ranges were 100 to 171 pr/hr
and 83 to 197 ur/hr.
A soil sample was taken near the
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