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3NL-=2E9 59
Thvrale Absorsed Dose AssSessmene for Rongeiaod and VUcirik Resicents
E.T.
Lessard, J.R. Naidu, &.P. Miltenberger
3rooxnaven National Laboratory
Satety and Environmental Procection Division
Upton, New York
410419
11973
&
N.A. Greenhouse
University of California
Lawrence Berkeley Laboratory
Berkeley, California
94720
o
L.V. Xaplan
Srooxhaven Summer Studenc Program
3rookhaven National Laboratory
and Yale Universicy
ABSTRACT
The incernal thyroid absorbed dose from Castle Bravo fallouc affecring Rongelap and Utirik Arolls, Marshall Islands,
indecendenc approacnes encompassing 1)
is reassessed using
.
che single nooled urine radio-
chemical analysis of March 1954 and currenc uptake, retention and excrerion
models, 2)
airborne concencrations and areal activities of the iodine
isotopes derived from historic soil samples and, 3)
and areal activities of
atrborne concenctrarcions
the todine isotopes derived from weather daca ab-
tained during the thermonuclear test experimenc ac Bikini Atol2 and current
fallout deposicion meceis.
Factors such as solubilicy of Lodine isotopes,
the possible contribution from neucron induced activity,
the impact of chy-
roid seekers other than iodine isotopes on dose, and confidence levels for
vaiues of derived quantities such as airborne accivicy concenctracions are
also considered.
Additionally,
these thyroid absorbed dose estimates are
compared to che incidence of thyroid nodules reported for the accidentally
exposed people.
BEST COPY AVAILABLE
Research carried out under che auspice of the U.
under Contrace No. DE-AC92-74CHO0016.
$.
Deparemenc of Energy