awe oa pen pote eiee Aa Acuivity atabay | Actin ity alday HZ mers vee la te 27 Oo oul Ruste caarth geese VUNT Cpa tbivesoud et Oo it - Oud OU Oo - Utada Ho Ob Gat uu weg” 1) V4 Virwsiber papatace tad Le Its uo. utd During the carly period after the fallout, radio- iodine was recognized as possibly ots must hazardgus constituent, but the estimated dase to the gland of [OG ta 150 rads was nat considered sulficient to cause later development of thyroid abhotialities, No acute effects were nated in any of the people that could be related Lo the internal absorption af radiiadines ur other cadiaisutapes, Contamiuiation of the akin resulting im extensive - Gal aiivecs af urine saniptes, begining 1 dvs mesteapeeure, for hr, i BA dhe rane carih wieeup. canal fissile quaterial, As espected, the Kenuedape people had the lighest bods tarcdetus, Wy Gomonths, beta achoaty da the urine vatipeles was barely detectable. Table SJ sbows the again ieerterpars Fouatnab at chaos 1 (eatrapolateal satues) anal wichay B22. Phe agreement latween the tivcinys at Hie two laboratories is clase considering the tech- Diques available al that Gene. Levels an the ling: hac geaaip were about ane hall aoc in the Aimer: ins about one-quarter the levels inthe Rongelip yroup. Oly isatepes af iodine, strontiuni, bari, wil a few rare carth clements were absorbed to any significant degree. lathe Kongelap group, at dhav Ur and MO wore near the shasimuain per. Thisssble levels, aackthe esauiied total anseunt of Padioacive aialerial ia the wastrointestiaal tract wkd Vatinated Todds Hareen (ai) of Rongelap People? fan te ke food and water (see Appendix °C). Otherinternally absorbed isotopes (see Table 3} were not thought to be significantlyabsorbed by the thyroid and probably contributed lithe 10 the dose to that gland, Conversely, the radiaiodines contributed only slightly to the whole-body radiation dase, ‘Pable 44 SOBee Agta Sy y lata burs ib the neck region a cG0° of the people (ace Figure 2) probably did not contribute to the thre) dene because of the low cavegy of the beta rachation. Possibly alight absarpiuon of radio jodines theough the shan occurred, When the people returned to Rongelap to live 121497, no radioactive isotopes of iodine remained (eacept possibly very slight amount of 790), and Vie principal remaining wotopes (3'Cs, !'Sr), which were absorbed tu low levels in the people, probably did net contribute tw any signifieaat degree tothe thyroid dose.4 Wher thy roid lesions began develauping in the Rongelap children da fig, the dose to the thyroid of the Kongelap people was reevaluated by James28 His estimates of the gaming dow agreed Approatmatcly with the previous estimate of 175 Voabet boaCi; whether this had any celition to the canqastratitestinal ss pions ie ot known? Rivdiolowical monitoring af personnel and environ tov at Reagelap and other atolls ia sulsequcne years is dim uased an Secnon Vb 5. Thyroid Dosimetry Whe fallout produced several possible squrces of tadhation caposuie tothe thyroid gland, The gaan uHopes ace produced in relatively bigh vickls by the fission process, Soame aire to short-lived te be af consequence, bat Pn CED Peg aad Map age sullciontly dong-beved to cause a considerable che tothe thyroid following internal absorption and concentration i dhatwhasd, and these were abe sarbedt oth via tobiatatin aock ei bigestiags iy ome * Vigure 2. Heta bugis (Afaech 2b 10). Nw ee or er NE ate ee i ee ee ee mi Cadiation resadted bn tharoicl doses of £77) raabs Hothe Ranyebip people, olf iads io the Aviacsa peoples anal Pb rads nthe Grartk eens. bode mae 4f