Co if the surface deviates from an infinite plane.
In the following, the process of dose estimation will be broken down in five
sections which cover ship movement, fallout dose deposition, radiological survey, dose rate variations and cumulative dose estimates.
This will then be
followed by an overall summary.
B.
Ship and Fallout Movement
Ship position data was obtained from the PATAPSCO deck log (ref. 4) and
plotted on an HO chart #81007 with an open water extertion to include the track
of
interest.
Figure 1 illustrates the time-based track of the ship together
with the track of fallout "hot line."
The position and speed of advance of the
fallout "hot line” up to BIKAR Atoll were obtained from reference 3 and super-
ons
imposed on the ships track.
Past BIKAR, available BRAVO reports do not agree on the
“hot line" location (ref.5)and data to extend this Tine are not available.
For
this reason the extremely conservative assumption that the "hot line" coincides with
the PATAPSCO track after 011200,
was made.
Figure 2 shows the advance of the
leading edge of the fallout cloud along the "hot line" as extracted from reference
3 along with the calculated and extrapolated 18 knot downwind speed.
Table
] combines the time based locational data for the ship and fallout cloud and
shows the intercept distance of 586 nmi down range at HK + 32.5 hours.
These
values were obtained from the large scale plot as illustrated in figure 1.
(3)