tl
aee ne
-
.7
a dtsilanizs
with
a J
a.
ractonuclices
~~
x
enxemaliiry
of£
some
grinzging coral
4
anc
q
=
lowost
the
reers,
:
.
The high island soils
contain
radionuclide
7
= *
4
~
contricutions
2
a
4
-
~~)
coral
—
riese
corsl
radiation
atclls and islands.
.
:
a
“
~
*°* Th' and 234
*7?*Urr and +their
daughters.
gamma emitters among these
result in background exposure rates
ive)
(Bb
|
_
@ddeiticnal
A
rallouc.
teorrestrial
as well as
T
Ta
7
wortad-vide
tty
-
losis gariec
(at 1 meter
above the ground) wnich are neariv a factor of two higher than
tnase similarly measured on the coral atolls
(Table 1).
Con-
tributions of stratospneric and trovospheric fallout are, of
course,
superimposed on these néetural background radiation sources
Data ror this study were obtained during three field trip years
(1975, 1973 and 1980}.
The first of the field trips was
conducted jointly with the University of Washington, Laboratory
of Radiation Ecology (LRE), which was responsible for determining
background concentrations of fallout
radionuclides
in terrestrial and marine biota (7).
in soil and
Brookhaven National
Laboratory (BNL) was tasked with the neasurement of external
background radiation.
Uw
Ua
(3
"3
“4
n
©
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5
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id
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et
rd
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my
iy accessibility via commerci2l airline.
rt
ct
ce)
4
ua
radiation measurements onlv.
a
2
=
Sn externai
Subsequent field trip activities focused
ed