[INTRODUCTION
Iron-55 is currently the most abundant fallout radionuclide
in marine organisms.
‘The radionuclide has been studied intensive-
ly because of its widespread occurrence since 1963,
nuclear test series in 1962.
data on
5
Fe
Brill
(1968)
:
levels in the environment,
considerations for human populations.
the mode of production of
.
.
+4
summarized reported
emphasizing
dosimetric
Persson (1969)
reviewed
.
oy
gs
.
.
its distribution in the biosphere,
(1970)
reviewed the occurrence of
cussed its distribution and possible
on
pe
VY)
5
Qu
Zz
aa
in marine
n
:
Fe
Fh
55
Fe,
Preston
oy
and its dosimetry.
55.
following the
.
:
tas
relative to other
fallout
v
stratospheric anomalics leading to heavy depositions of
radionuclides in northern
“
(1968)
suggested
LQ.
Jennings
that much
of the
55
Fe
55
Fe
latitudes.
from the USSR
tests of 1962 was deposited as tropospheric fallout in narrow
bands related to the test sites at 75°N and 52°N,
In a review of radionuclides in marine organisms at the
.fic
2.
Pa
.
test site in 1956 to 1968,
.
as
viisms were
By
or
wo
in plankton anc fish.
Lowman
(1960)
.
55
Other early reports of
those of Rema,
Koide
and Goldberg
reported a
.
.
Fe in marine
(1961),
who
found the radionuclide in the livers and hearts of Pacific Ocean
tuna 3: 1961,
and Seymour
(1963),
who reported its presence in
in skiptyack tune from the North Pacific.
acre
aw
“<K be
ak