: BUDGET AND REPORTING CODE | OAte . TASK TITLE Dose Reassessment for Rongelap and Utirik CONTRACTOR SAME as. Associated Universictie 19a. Facility Reculraments Inc. GX-91-92-01l-1l-(b) : . _CODE (003010) ; | 3NL! 3IN NUMBER | | {TASK NO. REPARED G4/02/79 : REV. 20. 0 It is anticipated that work for this proposal will use exiscing Laboratory facilities and site ucility services. 19b. Pubdlicarions. None 19c. Pursdose. To look for correlactons between the incidence of thyroid nodules in the inhabitants of Rongelap and Utirik Islands (Marshall Islands) and the reassessed dose estimates. This study will fuse together all available information on fallout from the 3RAVO test and using advanced anaivtical techniques (now available) derive realistic dose astimates =o the inhabicants of Rongelap and Utirik. The results should provide information cowards elucidating the whole question of lowlevel erfeccs cf radiation. me 19d. 3ackzround. Incidence of shyrcid nodules, benign and malignant, in the exposed popunations of Utirix and Rongelap has indicated critical differences in correspondence between nodule incidence and thvroid dose Zor the popularcions. The estimated external dose received from =he cime fallouc began to the time of evacuation shows that the Rongelap populacion received an external dose (175 rads) which was about 13 times chac for the Uririk porulacion (14 rads), and the thvroid dose was about 10 times larger, whereas che incidence of thyroid nodules in the two populations were not significantly different. A preliminary study has indicaced thar the critical area of investigation that couid sned light is the period during the fallout and evacuation for boch the islands. In addition, the face tnoac the Ucirik population returned within 120 davs following evacuarion, wnereas che Rongelap sopulacion returned only atcer three years, requires that we look closely at the Utirik population in terms of a longer exposure period, both incernal and external. would, Further scudies therefore, have to concentrate on the re-examination of all available data in reports issued sv various agencies during that period, consultations with scientific personnel involved ar thac time, idencifying the areas of uncertainty, and using appropriate computer arograms cto analyze the data. The end result will anable us to look for correlacions between the incidence of tuiyroid nodules and che reassessed dose estimatas. CK 103