as
well
areas,
as
ths
treat
Combine
to make evaluations of local
fallout
contribu-
‘lany small-scale radiological surveys were conducted during
lands;
3
red
the northern Marshail
Wn
the 1950's and 1969's at or near the Pacific testing areas in
nowever,
definitive evaluaticns
of the impacts of residual fallout radioactivity were not made
until
the
1270's
{1-3}.
These evaluations were conducted on
those islands known or suspected to be contaminated by tropospheric fallout from the tests at Bikini and Enewetak Atolls.
Pacific
were conducted on a small scale during the testing vears
(1945-
T
r
1979, and 1980 by Brookhaven National Laboratory as well.
~~]
and thereafter in 19
O
A
@
1958) by the University of Washington,
“/1
Environmental studies of peripheral areas in the central
studies vielded significant data on bacxground radiation levels
in these areas,
and form the basis
for this
report.
The Marshall Isiands are all comprised of coral atolls or
partially drowned atolls formed by coral limestone accretions
on subsiding volcanic bases.
Drilling studies at Enewet2k
established that the limestone cap may exceed 1280 meters in
thickness
(6).
As
a result,
the contributions of the uranium
t
tb
7)
remote
from
th2
tast
Oo
a)
FA
External background radia
ui
raciati
ho
by cosmic
w
h-
islands
GQ
~
those
a
>
are virtually nil.
ct
and thorium series tothe radiation environment in the Marshalls
sites
levels
are
on
dominated
,
Sane fron
fea YORk,
contributions
upplemented: by small
=