e
the greatest likelihood of the presence of plutonium.
The
values given in Table 14, therefore, probably are maximum values
for each type of sample.
The ratios of
239,240
Pu
238
to
Pu.
approach 2:1 at Eniman I. and are about 15:1 in Bravo Crater.
Bikini I. soils contained no detectable
.
.
Pu of the samples
The presence of 239,240), and 20755 in goatfish viscera
is consistent and probably results
.
Pu, although they
239,240
contained the highest concentration of
analyzed.
238
.
,
from direct ingestion of fine
.
particles of sediment during feeding.
The absence of
238
~
.
“Pu in
goatfish viscera as compared with the sediment merely reflects
a low concentration of this radionuclide,
below the
limits of
Getection.
Although none of the 1969 samples were analyzed for the
X-ray emitter 6 Ni,
this radionuclide was found in concentrations
of 80 d/m/g dry weight in Bravo Crater sediment collected in
1967
(Beasley and Held,
1969).
Nickel-63 is of particular interest
as a tracer since it has a half-life of 92 years.
the
fore
.
63_,
clam kidney accumulates
Ni,
an
.
60
as it does
Co,
ce of
indicator organism for the presen
Another long-lived radionuclide,
In addition,
:
and is there-
rtment of Energy
63 Ni. Depa
uistorian’s Office
ARCHIVES
108m
Ag, with a half-life
of approximately 100 years, has been identified for the first
time among the radionuclides at Bikini.
This radionuclide was
detected from the gamma-ray spectrum of the hepatopancreas of