shock wave was perceived at the Japanese fishing boat as two loud réports
like rifle shots, arriving 7 or 8 minutes after the flash was seen.[|
At
Rongerik the shock wave shook the windows in the buildings 11 minutds
after the first blast was observed
(Reference 68).
The cloud formed was like a funnel with the narrowing at about
feet
(19 km)
altitude.
The growth of the cloud
45,000
is shown in Figure
98.
early as 10 minutes after burst, the cloud was already more than 65
{106 km)
across.
As
files
At about H+30 minutes, aircraft from the cloud phdtogra-
phy project visually observed material falling from the cloud from
point at which the funnel flared out
e
(Reference 26).
At Station 70 on Eneu, radiation readings began to rise within one-half
hour of the burst and at 1 hour reached 250 R/hr
(see Figure 59).
The
Personnel within the bunker were well sheltered; during the fallout
the reading within the structure was 0.035 R/hr
(Reference 16, p. K-
The fallout picture at Bikini at this time is summarized in Figure 5
At 0800, the fleet began to receive fallout, which resembled pin
Sized white and gritty snow.
The USS Bairoko and the USS Philip wer
paring for the reentry sequence to Bikini.
A helicopter had been la
from the Bairoko for radiological reconnaissance, but was recalled w
the CTG 7.1 informed the Bairoko that the Eneman complex was radiolo
too hot for reoccupation.
The source of information for CTG 7.1 may
been the Station 70 bunker on Eneu.
Plans for the launch of four ot§er
helicopters, including one to aid the USS Molala in controlling the
lying west of Bikini, were also cancelled (Reference 80).
The radiation levels aboard the ships built up quickly, from 0.0
1 R/hr on the Bairoko in 5 minutes.
At this time the Bairoko was 31
(57 km) at 133° from the Bikini ground zero.
on all affected ships,
Washdown systems were
and CTG 7.3 ordered the vessels south to 50 n
km) from Bikini at "best speed"
(Reference 80).
210