a
Oem ae
.
ae
aay
Hen
from 127Cs for Bikini Island was found typical of other nonblast areas of the atoll.
In blast areas, however, °°Co was
the dominant contributor to the exposure rate levels with |
.225Sb also quite prominant.
ver ae
The relatively minor contribution
of *37Cs compared to ®°Co and +*5Sb in blast areas is quite
significant and may be related to the types of weapons tests. ~
ae
conducted nearby.
Many or these tests were conducted on ......-- -
barges and the resulting activation of 5®°Co and ®°Ni in the..-
steel of the barges account for the large amount of ®°Co
activity.
The maximum exposure rates measured on Bikini Atoll in
1967,
somewhat over 300 pr/hr, were in blast areas very near
the ground zeros of tests.
At one isolated area on West
i.
Eneman near the crouncd zero for two surface tests we
--
measured an exposure rate just over 500 ur/hr.
Since
vegetation in that area was generally sparse and the organic
-
”
~
some significance in reducing the radiation levels in these
y the
~
a
oN ee
“
a“
ok
%
.
£
.
i
Also the greater proportional contribution of the shorter- . .
.
i
kes
areas more rapidly. than in the more densely vegetated areas.
“
_
&.
content of the soils was quite low, weathering may be of
~
;
+
a
&
5005141
a
,
.
Sr
eee
Oe Ee
Sp,
fof
cra
i.
—_
mes
%
t
i
=}
“