Table 216.
Enewetak soil data, southern islands (pCi/g in top 15 cm).
90...
Group A
(DAVID,
ELMER,
FRED)
Mean
Range
0.41
0,02-4.8
137A,
2395,
Mean
Range
Mean
0.21
0.01-2.1
0.04
Group B
(All others
except
LEROY)*
Group C
(LEROY)
Range
Miean
Range
0.004-0.31
0.03
0.01-0.15
.
,
0.52
0.03-3.9
0.14
0,004-1.8 0.07
0.004-1.1
0.06
0,007-63
11
1.6-34
3.2
,
0.5-10
0,02-2.0
.
0,58
0.04-5.0
0.63
4S AM, TOM, URIAH, VAN, ALVIN, BRUCE,
CLYDE, REX, WALT, GLENN,
HENRY, IRWIN, JAMES and KEITH.
part of YVONNE which lies north of the
tower (Sta.
80 a,
1310).
This area includes
In an effort to obtain a reasonable
estimate of the three-dimensional distri-
the highest external gamma levels found
bution of radioactive material in this area,
on the Atoll, with levels of 500-750 uR/hr
45 profile locations (shown in Fig. 152)
found over a five-acre site just south of
were sampled to 150-cm depths. Plutoni-
the CACTUS crater,
um data for the profiles along the center
In addition, pieces
of plutonium metal weighing as much as
of the island, and across the island at the
several milligrams are randomly
position of the plutonium-bearing layer,
scattered on or near the ground surface
are shown in Figs. 153-156.
over most of the area from CACTUS
all of the profile samples lead to the
crater to a line drawn across the island,
following observations:
about 60 m north of the tower.
Construc-
e
Data from
There were no large plutonium
tion and earthmoving activities during the
particles analyzed in any of these
testing period, for which we have no
samples since the maximum
reliable record, served to redistribute the
Specific activity found was ~800
radioactivity in such a way that it is
pCi/g.
essentially impossible to get an accurate,
Except for the area in the general
detailed, three-dimensional survey of
vicinity of the exposed plutonium
radioactive species present in this area
layer, there were few profile
now.
sampling locations where plutonium
tower,
Four hundred meters north of the
for about 100 m along the ocean-
concentrations exceeded 100 pCi/g
side embankment, for example, there is
at any depth.
Of the four that did,
a visible layer of dark soil roughly 20 cm
two had the high concentration in
thick, 10 to 20 cm belowthe surface,
the top 10 cm of soil.
which contains high concentrations of
sampling locations where plutonium
plutonium (3200 pCi/g in one sample).
concentrations greater than 100
Profile