we ee
“nforeseen
fallout of small radioactive particles
(less
th an 5 microns)
curred on the night of D+tl and covered the atoll, raising pee lev3 DY approximately 0.100 R/hr.
The small radioactive fallo
particles
-t@ more difficult to remove than the fallout from the larger BRAVO parti_:5.
The secondary fallout stopped between 0700 and 0800 on D+2.
Resid-_
2al topside levels for ships that received fallout are given i n Table 32.
Fallout contaminated the western quarter of the lagoon wit h radiation
-v3ls comparable to those of BRAVO.
Lagoon flushing through
rhe south-
2st passage substantially increased background radiation leve is in the
“.cinity of Oroken, Bokaetoktok, and Bokdrolul.
On shot day the low-intensity contamination moving to the focenves
‘aS reported by Wilson 3, and accordingly an alert message was dispatched
70 the Enewetak garrison indicating the presence of a westerlyjfmovement of
‘ventgen-range contamination approximately 60 nmi
[EF ground zero.
(111 km) wes {-northwest
Although calculations indicated the contamina ion would
2ass to the north of Enewetak, all personnel at that atoll werd
to remain on alert status until H+24.
directed
No significant fallout
as subse-
quently experienced, a fact verified by a report at 1900 from
e Enewetak
monitoring system indicating 0.001 R/hr maximum on Enewetak ang
Parry and
zero background on Lojwa.
of ground
The low-intensity contacts southwest]
zero were not considered significant for Ujelang.
Fallout began on Enewetak Island on D+2 at 1500, with peak
0.010 to 0.015 R/hr.
high as 0.040 R/hr.
Feadings of
There were also local "hot spots" with refhdings as
These areas were posted with danger signs,] and per~
sonnel were not allowed to enter them.
On D+t5, the maximum intBnsity was
0.010 R/hr at Enewetak Island.
On 31 March, the TG 7.3 unit on Kwajalein reported 0.009 R/§r maximums
¥
=
=
=.
=
on the windward side of tree trunks, averages of 0.001 to 0.003§R/hr on
beaches, and 0.001 to 0.004 R/hr on windward sides of buildings
erage Kwajalein background before 31 March was 0.00005 R/hr.
265
The av-~-
Aircraft on
os