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
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 og the sputhern islandsof Enewetak are very close to
natural background; 10
C kg
“h
(3.7MRh~).
This low-level was due to
Pe
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re
a
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eet
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b=
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a
uJ
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attsTV ale)
ac
UTIRIK ATOLL
Oaase UST) mactek ILC)
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va
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Roya
10>
TIME PAST REHABITATION, days
46
EXPOSURE RATE AT ONE METER ABOVE SURFACE
the extensive clean-up at Enewetak prior to rehabitation.