TLE
BUDGET AND REPORTING COTE
Dose Reassessmenc for Ronzelap
ing ‘ticix
ZONTRACTOR NAME
Asscciated Universities
-tas.
:
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HADI - 0 L-31-9
CODE
ant
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WP NUMBER
DATE IQEFALED
32/3130
| TASKNO
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REV NC
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2
facilitcv Requirements.
It ts ancicipated that work for thts proposal will use existing Laboratory
Facilities and site ucility services.
wy
eb.
Publicacions.
Data generated in chis study has been used in other reports.
w~vC.,
Purpose,
To Look for correlations between the incidence of thyroid nodules in the
inhabitants of Rongelap and Utirik
Islands (Marshall Islands) and che reassessed
jose estimates.
This study will Fuse together all available information on fallout from the
4RAVO cest and using advanced analytical cechniques (now available) derive reaiistic dose estimates to che {nhabitants of Rongelap and Utirik.
The results snould
-rovide
information towards assessment of
the
risk coeffictants
for
radiation-
~iduced thyroid disease.
awd.
Backzround.
Incidence of thyroid nodules, benign and malignant, in the exposed dopulitions of Uctrik and Rongelap has tadicated critical differences in correspona=znce between nodule incidence and thyroid dose for the populations.
“The estinated external dose received from the cime fallout began to the time of evacuaticn
snows that the Rongelap populacion received an external dose (175 rads) which was
apouct 13 times that for the Ucirik population (14 rads), and the thyroid dose was
z20ut
10
times
larger,
whereas
the tneidences of
thyroid nodules
in the
cwo
popula-
tions were not significantly different.
A preliminary study has indicated thar the critical area of investigation is
tne pertod starting from che beginning of fallout to the completion of evacua-
tion for both che islands.
In addicion, the fact that the Ucirik populacion re-
curned within 120 days following evacuation, whereas the Rongelap population recurned only after three years, requires that we look closely at the Utirik popularion in terms of a longer exposure period, both tneernal and external.
Further
studies would, therefore, have to concentrate on the re-examination of all availadle data in reports issued by various agencies during that perfod, consultations
with selenctific personnel involved ac that time, ideacifving the areas of uncerThe end
caiacy, and using appropriate compucer programs to adaiyze the data.
rasuit will enable us co look f2r correlat‘ons between the incidence of thyroid
rodules and the reassessed dose estimates.