SLIDE 43
Environmental levels of external exposure.
Exposure rates were observed to
decline following each test.
At Rongelap and Utirik the residual levels from
BRAVO fallout overshadowed the residual radiation from other tests.
Occational elevations due to fresh fallout were evident, however, the exposure
tad
Q
nd
ra
5
oe)
eu)
>
re)
a
<
ac
ve
UTIRIK ATOLL
OeyOMLOL
Bie
OPERATION REDWING
ff
li
=
rm
Fa
S
7
hos
=
Pr
uJ
a
=
°
5
Gl
TIME. PAST REHABITATION, days
EXPOSURE RATE AT ONE METER ABOVE SURFACE
rate would return to the BRAVO baseline within several weeks.
The levels at
Bikini Island during the early 70's were about 5 times the levels at
Rongelap.
The levels oR the sputhern islandsof Enewetak are very close to
h
natural background; 10°’ C kg
(3.7 MR h
«
This low-level was due to
the extensive clean-up at Enewetak prior to rehabitation.