SUMMARY AND CONCLUSIONS
Extensive modification of the “IATHEW-ADPIC code suite has produced
contours of Castle
Bravo accumulated and time-integrated deposition
for zross
fission produets. Through the use of cose conversion factors, these contours have
been converted to cose rates and total doses up to the time of evacuation from the
atolls
affected
by
the
debris
cloud.’ In
addition,
both
time-integrated surface concentrations have been calculated.
instantaneous
and
For the neurest
atolls, the calculations agree well with the measurements and total dose estimates
based on these measurements. At the more cistant atolls the agreement is not as
good, indicating the need for more "tuning" of the code input parameters.
The internal dose to the inhabitants of tne affected atolls have not heen made
in
this
report.
Interviews with natives of
Rongelap Village and
Ailinginae! 2)
indicate that many people ate fresh seafood and drank water from cisterns following
contamination of theic islands.
Although there is no direct evidence that those at
Utirixk ate and drank contaminated fooc and water, it seems likely that they did
since the dry deposition from Bravo was consicerably less tnan at atolls to the west.
However, the previous section indicated that rain probably neecurred during the time
of fallout. This would result in wet deposition, producing local doses 10 to 350 times
greater than in those areas where rain did not occur.
This effect could have
resulted in develooment of thyroid nodules in those Utirik residents who consumed
contaminated food and water.
REFERENCES
L.
Hawthorne, Yowacd A., Ed., "Compilation cf Local Fallout Data from Test
Detonations 1945-1962 Extracted from DASA 1251," Vol. Il - Oceanic U. S.
Tasts, DVA 1251-2-EX, DASIAC, Santa Barcara. CA 5102, May iat4.