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Thvroird Absorzed Dose Assessment for Rongelap and Ucirik Resicents
E.T. Lessard, J.R. Naidu, &.P. Miltenberger
3rooxhaven National Laborazoary
410800
Sarety and Environmental Proceccion Division
Upton, New York
11973
&
N.A. Greenhouse
University of California
Lawrence Berkeley Laboratory
Berkeley, California
94720
&
L.V. Xaplan
Brookhaven Summer Stucenc Program
Brookhaven Nacional Laboratory
and Yale University
ABSTRACT
The incernal thyroid absorbed dose from Castle 8ravo fallout affeceing Rongelap and Ucirik Acolls, Marshall Islands,
snderendent approaches encompagsing 1)
is reassessed using
the single sooled urine radto-
chemical analysis of March 1954 and currenc uptake, rerencion and excrerion
models, 2)
airborne concentrations and areal activities of the iodine
isotopes derived from hiscoric soil samples and, 3)
airborne concentrations
and areal activities of che todine isotopes derived from weather cata obtained during the thermonuclear test experiment at Bikini Atoll and current
Factors such as solubilicy of fodine isotopes,
the possible contribution from neutron induced activity,
the impact of cthy-
roid seekers other than iodine isotopes on dose, and confidence levels
tty
fallout daposirion models.
for
vaLues of derived quantities such as airborne activity concentracions are
also considered.
aAddicionally,
these thyroid absorbed dose estimates are
compared to che incidence of chyroid nodules reported for the accidentally
exposed people.
BEST COPY AVAILABLE
Research carried out under the auspice of the U.
ander Contracce No. DE=AC02-76CHOOOL16.
S$.
Deparcmenc of Energy