SUMMARY AND CONCLUSIONS
Extensive modification of the MATHEW-ADPIC code suite has produeed
contours of Castle
Bravo accumulated and time-integrated deposition
for zross
fission products. Through the use of dose conversion factors, these contours have
been converted to case 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 nearest
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 the affected atolls have not been made
in
thts
report.
Interviews with natives of Rongelap Village and
Ailinginae! ®!
indicate that many people ate fresh seafood and drank water from cisterns following
contamination of theie islands.
Although there is no direct evidence that those at
Utirixk ate and drank contaminated food and water, it seems likely that they did
since the dry deposition from Bravo was considerably less tnan at atolls to the west.
However, the previous section indicated that rain probably occurred during the time
of fallout. This would result in wet deposition, producing local doses 10 to 50 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, Howacd A., Ed., "Compilation of Local Fallout Data from Test
Deatonations 1945-1962 Extraeted from DASA 1251," Vol. If - Oceanic U. S.
Tasts, DNA 1251-2-EX, DASIAC, Santa Barsara. TA 95102, May 2279.