vis
4
.
4
a Bae
Me et
|
4
rr
_
3NL-28939
Thyroid Absoroed Dose Assessment for Rongelap and Utirik Resicents
E.T. Lessard, J.R. Naidu, &.P. Miltenberger
3rooknaven National Laboratory
Satety and Environmental Protection Division
Upton, New York
&
ACOSO)
11973
N.A. Greenhouse
University of California
Lawrence Berkeley Laboratory
Berkeley, California
94720
te
L.V. saplan
Brookhaven Summer Studene Program
Brookhaven National Laboratory
and Yale University
ABSTRACT
The internal thyroid absorbed dose from Castle Bravo fallout aftfecrsng Rongelap and Ucirik Acolls, Marshall Islands,
incgependent approaches encompassing 1)
is reassessed using
che single poagled urine radio-
chemical analysis of March 1954 and currence uptake, retention and excrerion
models, 2)
airborne concentrations and areal activities of the tfodine
isotopes derived from historic soil samples and, 3)
atrborne concentrations
and areal activities of the tfodine isotopes derived from weather data obtained during the Cthermonuclear test experiment at Bikini Atoll and currence
fallout deposition models.
Factors such as solubiliry of tfodine isotopes,
the possible contribution from neutron induced activicyv,
the impace of thy-
roid seekers other than lodine tsotopes on dose, and confidence levels for
Va.ues of derived quantities such as airborne activity concentracions are
also considered.
Additionally, these thyroid absorbed dose estimates are
compared to the tncidence of thyroid nodules reported for the accidentcally
exposed people.
Aesearch carried our under che auspice of che U.
under Contract No. DE-Acd2-746CHO9016.
S.
Departmenc of Energy