Mean 40% concentration
TOL
2oO
O
—
5 7
|
.
A 137, - entire fish
B
3
v
1.0bR
©
2
0.5-
c
0.3
——
i= eviscerated whole fis
E
207, ;
e
a
h
|
fi
a
h
7
2
a
ec
=
o
2
7:
= viscera
7
6
“oO
155 Eu
D 207, - viscera
5
£
-
IS5ey - eviscerated whole fish
Cc
2
~
J
Column legend
=a
bs
OF FIL
7
hr
r
ry
m7
I
pa
|
a
ry
ba
z
© 0.05g
jd
=~ 0.03 -
hs
=
=
4
{
0.0) LUAIBICHOLE] TARsichodel tafetctcte)Ags tcpfeh Pap atcfope) AgegCJOFE] AB POVEY Av etcporey
BELLE
RENE
JANET
URSULA YVONNE
DAVID
FRED
HENRY
PAL FIFE
LERCY
Collection site
Fig. 160,
Average 13Tog
levels (av 15 pCi/g).
and 207; concentration in convict surgeon from
but 25 pe,
1972.
The 40k value is the mean for
9
No 69 Go, 207 Bi,
or 155.) were observed,
9055,
155
Enewetak Atoll, October to December,
all convict surgeon samples,
800 and 2075; data for the two collection
137 a5
and 239, 240 by were found in some
periods,
The effective half-life of 2.7 yr
for 8005 {radioactive decay half-life
or all of the samples, usually at levels
5.24 yr) and 5.1 yr for 207 Bi {radioactive
comparable to the lower values found at
decay half-life 30 yr) implies an effective
Enewetak.
half-life in the ecosystem for both isotopes
As. with the plankton,
comparison of
of about 5-6 yr.
data obtained from this survey with similar
Of the marine invertebrates present at
data from samples taken in 1964 indicates
Enewetak, tridacna clams, Sea cucum-
that, for some nuclides at least, there are
bers, spiny lobster, and top snails were
processes operating to reduce concentra-
collected and analyzed,
tions in the lagoon faster than is expected
806 was the most abundant radioisotope
from radioactive decay alone,
found, and it was present in higher
Table 220,
In the tridacna,
amounts in the kidney than in the viscera,
for example, presents a comparison of
I-24