SUMMARY AND CONCLUSIONS
Extensive modification of the MATHEW-ADPIC code suite has procuced
contours of Castle
Bravo aecumulated and time-integrated depositicn
for
fission products. Through the use of dose conversion factors, these contours have
been converted to dose rates and total doses uo to the time of evacuation from the
atolls
affected
by
the
debris
cloud.
In
addition,
time-integrated surface concentrations have been
both
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 tne affected atolls have not been made
in
this
report.
Interviews with natives of
Rongelap Village and
Ailinginael 9}
indicate that manv people ate fresh seafood and drank water from cisterns following
contamination of theie islands.
Although there is no direct evidence that those at
Utirik ate and crank contaminated food and water, it seems likely that they did
since the dry deposition fram Bravo was consicerably less than at atolls to the west.
However, the orevious 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 oecur.
This effect could have
resulted in develooment of thyroid nodules in those Utirik resicents who consumed
contaminated food and water.
REFERENCES
l.
Hawthorne, Howard A., Ed., "Comoilation of Local Fallout Data from Test
Detonations 1945-1942 Extracted from DASA 1251," Vol. If - Oceanie U. S.
Tasts, DNA 1251-2-EX. DASIAC, Santa Barsara, CA W102. May 1279,