be made.
Table 4 summarizes the fallout pattern characteristics froz
the Bikini tests.
The last column in most cases indicates that the
wind directions precluded fellout on the islands.
tions are Bravo and Yankee.
were in fact made.
The definite excep-
For Bravo and Yankee, off-site measurenents
None cf the Enewetak shots resulted in fallout on
Sikini er other islands to the east, so the test operations in Table }
can be ignored.
,
* Figure 2 shows the Marshall Islands relative to the test loce_ tions.
The Bravo fallout pattern has been reconstructed independently
by AFSWP, NRDL and RAND using some modelling, while the Yankee pattern
is based on extensive surveys.
_ Yslands are given in Table 5.
The one-hour dose rates for affected
All of the listed islands are outside
the lowest dose-rate (100R/HR) contour for Yankee (Rongelap is just
barely); the levels are stated only to the nearest decade since
extrapolat jon had to be used.
The range of values for Rongelap and
’ Rongerik is due te the variation of the Bravo pattern across the
. respective island.
By and large, Bravo is the predominant contributor.
Table 6 provides 1977 estimates of the ts23? dose rate for
' these fslands.
On the basis of the limited comparison performed for
, the Enewetak case, these values could be reduced by a factor of about
6 to account for soil migration, provided the geology is similar to thet
. for Enewetak.
,
DOE ARCHIVES
The final part of this paper jis devoted to identifying with
" high confidence which islands did not receive fallout from the Bikini
“tests. Table 4, as discussed above, indicates that only Bravo and
_ Yankee definitely resulted in fallout on the islands; this fs basec
on the use of off-site measurements to reconstruct their respective
fallout patterns.
The other shots in the Castle operation, for which
there were no off-site measurements, apparently were not a problem.
However, a detailed investigation is warranted and is reported on in
the appendix.
Also contained there {is an extrapolation of the Bravo
_and Yankee patterns to a level consistent with background.
3