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TITLE BUDGET AND REPGRTING CCC)E I DATE ??~?A2E2 Dose Reassessment for Rongelap ~ ilA-02-01-!31 1 CONTRACTOR NAME CODE I ‘WP NUMBER TASK NO. REV. NO, It is anticipated that work for this proposal will use existing Laboratory facilities and site utility services. Chronic Dose Equivalents for Iongelap and Utirik Residents - 1954 ta 19’30, 3~iL The purpose of this rzsearch is to refine the estimated thyroid absorbed doses received by members of the Xongzlap and iltirik Atoll populations in the Nayshall Islands. These doses will be compared to t’nethyroid nodule incidence ta provide information towards assessment of the risk coefficients for radiation induced thyroid diseasz. Incidence of thyroid nodules, benign and malignant, in the exposed populations of Utirik and Rongelap has indicated critical differences iz correspondence between nodule incidence and thyroid absor5ed dose for these pcpulatio~s relative to that reported by the Japa~ese ~unor Registry Life Spe~ Study or the other populations under study as reported in 31Nt 111. The estinated external dose received population received an extarnal absorbed dose (175 rads) w“nichwas about 13 tiaes that for the Ctirik pOp~J12tiOn (14 rads). The thyr~id absorbed doses uere estimated originally to be several times these external doses. A preliminary study has indicated that the important dosimetric area of investigation is che ?eriod starting from the 5egi~ninS of fallout to the compleELon of evacuation for both the islands. In addi:ion, the fact that the Utiri’x ?opulation returned within 120 days followlxg evacuation, whereas the xo~gela~ population returnetiafter three years, requires that the Utirik ?opula:ion be external. Furtker studies vould, therefors, have to concentrate on the reexamination of all availabl~ data i? reports issued by various agencies during that period, consultations ‘wi:’n scientific personnel involved at that tiae, identi~yins the areas of uncertainty, and ‘usin3zppro?ziare cca?ucer programs to ardyze che data. The end result will e~able comparisons between the incidence of thyroid nodules and the reassessed dose estiaates.
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TITLE ~ BUDGET AND PEPORT:NG CODE i DATE PREPARED CONTRACTOR NAME CODE TASK No. ! REV NO. Associated Un, versitles, Inc. 20. Detail Attachments. cent. The study will comprise: 1. literature search for all available data concerning the IR4V0 tests such as, meteorological conditions and radiation measurements, and discussions ~’ith exposed Xarshallese cnd with scientific and technical personnel involved in tb.e 2. use of his:oric soil samples, food samples and teeth samples to detenniae 4. ccnputer simulation of ch.eBWVO test fallout to deternine the transport ard deposition of radionuclides, abundance of 1-129 atoms per unit 3RAV0 activity. Fiscal control will ~e exercised in the fora of nonthly comparisons, over Ehe task term, of actual costs incurred against corresponding line items of the “Dudget. Technical results shall be monitored through a periodic review, by the Contractor Task >lanager, of accoa?lishnents by neasuriag actual perfoaance as compared zo accepted standards for ?&Eland other investigative ar analytic procedures, as Technical Progress in FY 1980. A repor: on the diet and living ~attzrn of t’neXongelapese and Vtiri”kese has zdtiitionaldata that has beez acquired. T“nyroid SIaads from the exposed !.!arshallesehave bees analyzed for Yc-99 and 1-129. A??roximately 50 historic soii saaplss have been analyzed for 1291 and ocher dosi~etricall;~ %~portant nuclides. has 5een completed on the dose equivzlsnt followi~g renabitation of To>qelzp and Utirik Atolls after the l.!arch1954 evac’~a:ion. This work involved 2eteminat%an of post return thyroid and other organ closeequivalsncs :~r i~dividu.alsar.dpopulation
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TITLE 9UDGET AND REPORTING CODE 1 DATE ?REPARED Dose Reassessment for Rongelap FLA-02-01-01 03/31/81 CONTRACTOR NAME CODE WP NUMBER 20. Detail Attachments. cont. f. Technical Progress cont. Expected Progress in FY 1981. Additional samples of soil, food and ash will be analyzed for 1-129. Sr-90 and Pu-239, 240 analysis of teeth samples, especially that from exposed individuals, will be done. Data derived frcm the “’BikiniAsh” studies will be factored into the refinement of the dose estimate. Diet and living pattern studies will be updated. Expected progress i~ FY 1982. Factors such as soll~bility of iodine isotopes in fallout, the possible contribution from neutron induced activity, the iapact of thyroid seekers other than iodine isotopes on dose, and confidence levels far values of derived quantities such as airborne activity concentrations during fallout will be investigated. Diet and living pattern stzdies will be updated. !)iet and living pattern studies and dose reassessment will continue until completed for all areas of interest in the Xarshalls. The techniques and expertise developed in the course of this s~udy could be used to reassess doses zo populations in other areas subjected to exposure from fallout or even those resulting from occupational situations in the past. .Additionally, this study will provide a better estinare of the true value for thyroid nodule incidence per unit rad enabling technically sound risk factors to be associated with ionizing radiation exposurz. 1. This study will help establish external and internal dose estimates from the time of the incident to the present, and will complement the aerial survey for external radiation measurements, over these islands, ,~hich has been completed. Together they should present a relia51e picture of doses received by the populations and also enable dose estimates to be projected into the future. 7-. This stwiy sill be in close conjunction with the 3??%Yarshall Islands Radiological Safety Pr~gram (3.1-02-01-02). Continued collaboration with the ~ni.~ersity of ‘Jashingcon,Laboratory of Radiation Ecology, and the Battelle i?acific Xorthwest Laboratory will be ~intai~ed in the area of sample analysis and data
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TITLE BUDGET AND REPORTING CGDE \ DATE PREPARED TASK NO, ! REV, NO. Z(-), Detail Attachments. cent. impacts sinilar to those described in and covered by BNL’s Environmental i~pacc
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