anda i 7 3 ~OS@ Ae@assessmenct <To 229nge.ap 3 coe Associateg Jniversites, inc. ae SATE FQEPaRrRed WaNjJ7-01L-31 wae oe ame i TOUMNTRACTOR NAME 20, SUCDGET ANDO 282CRING COCCE 93/31/32 AP NUMBER 3NL TASK NQ REV ; oc NO Jetail Attachmencs Facilisy Requirenents. Naidu, J.2., Graenhouse, Diec and uiviag Patterns. Lessard, ‘.A., , and Xnight, J. BNL 51313, July, Z.Te, Greenhouse, N.A., Marshall tslands: A Study o 1980. and Miltenberger, 8.?. A Reconstruction of Thnranis Tosa Squivalants for Rongelap and Utirix Residents - 1954 to 1980, . th is anticinated that work for this proposal will use existing Laboratory s and site ucilicy services. 3NL Purgosa. Capen The surncse of this research is co refine the estinmarad thyroid adsorbed acses recaived ov members of the Rongelap and Utririx Atoll sopulacions in the Marshall lslands. These doses will be compared co the thyroid nodule incicence t9 provide infcrmation towards assessment of she risk coerfictents for radiation snduced iinvroid disease. sucigence of thyroid nedules, benign and aalignant, in the exposed pooulations of Teivrix and Rongelap nas indicated critical differences in correspondence between nodule incidence and thyroid absorbed dose for these sopulations relative 72 tnat reported Dy the Japanese Tumor Registry Life Soan Study or the other popusaztions under study as reported in BIER IIIf. The estinated external dose received irom ihe time fallout >began to che time of evacuation shews that the adult songe-2P TopUuLation received an external absorbed dose (175 rads) which was about 13 cine tAat for the Yeirix sopulation (14 rads). The thyroid absorbed doses were 2stinatead originally 79 be several csines these external doses. relininary scudy nas indicated that che importants dosimetric area of fallout to the cemple= tion 3f ton for doch she islands. In addizion, she fact that the Vstrik Tosulation c a withia 744 125 davs following avacuation, vhersas tne Ronzgelas TosuLatio Lon taturnead alter three vears, requires that th Ttirtk senulaztion be 4 investiig tion is the veriod starting from the beginning of 2xazined 2 _ é saiiv in tems of a Longer exposure seriod, sx0th internal and 2xtarnal. gtuciles would, therefore, have £9 concentrat2 on the rTaaxanination of 2il availabi2 data in vrasorts issued ay varisus agencies during that period, sonsultations with sciencilic personnel involved ar chac tine, idencifcvring Tae avtaas of uncertainty, and using approoriate computer arograms to analyze the Sata. The end resuit will enable comparisons between the incidences of thvrroid nodules and the reassessed dose astimates.