Discussions of the lagoon contamination following Shots BRAVO, UNION, and
YANKEE,and pertinent assumptions concerning these environments, are as follows:
Shot BRAVO
Documentation (e.g., Reference 1) indicates that the water throughout the
lagoon became contaminated by BRAVO plus three days (4 March); however, little is
known of the water intensity levels.
Therefore, it is assumed that ships entering the
lagoon on or after 4 March became contaminated to the saturation level one day after
entry into the lagoon.
Shot UNION
The
water
in
the vicinity
of
contamination following this shot.
the
anchorage area was relatively free of
However, five days after the shot (1 May),
messages indicate that lagoon contamination was presenting more of a problem. For
the present analysis, it is assumed that contamination spread to the anchorage area
five days after the shot, and ships that entered the lagoon on or after 1 May reached a
saturation level of contamination after one day of exposure to this water.
Shot YANKEE
Documentation indicates that the water in the anchorage areas became contaminated the day of Shot YANKEE (5 May). For this analysis, it is assumed that any ship
entering the lagoon after the shot reached saturation if it remained there for a day or
more.
-
*
Also following Shot YANKEE, the SIOUX encountered contaminated water while
steaming
outside of the lagoon.
The water intensities are recorded in detail in
Reference 13 (see Figure 2-30). With this information, the full contamination modelin
Reference 6 is applied to calculate the crew's exposure.
In order to demonstrate the inferred build-up and decay of the intensity below
deck
as
a
ship
enters
and
leaves
contaminated
31
water
(the
Bikini
anchorages),