74 BPFECTS Of NI? “SO, On the basis of ui is-nined iptake of 2) per vent per 2! hour. tue iatesrated dose to the thyreid from 17 ona ataer shorter lived od.» isotopes was calor tated oy the DSNRDE, to te about 100 rep. The Lovsh nas estimated tia this dose was about Po cep for Rongelao sraye and 50 rep for the Americans The differing ueproaches used by the USNRDL and the LAST. for estimating the body burden gave result. «hich, except for Bal’. are very close The mean bod bardens of the tudis teu nuclides presenter or TPabe oi were caleubited for the Longelop oie Values foe Aghnginie reap were Upproximatery tue aif those of the Ronzelen group. and ssitues fe Americans. wbou Rongelap group. ne fourty those ono the The totai amount of rodonuetive rarer present in the Gr. 7 tract atene diay post detor 4 tion in the members of frroup Twas estinaterd as approxmiately dome. “Diis activity was cor tributed chiefly by isotopes of short radiologic: and biologieal lia fo] fe and |omited solutiuiiny Thus the levels ot acti ty body were relatively of radiorsotopes it permod 6 fe not: ss compared to the part doses of I) as prepan choemutter followsexeostre dose to the thyreid detopanicn tue crime ol most ss <i te sohible the most dinzardot sa early The concentratie: sontis post was barely detect ule posed individuats Todine, which a the tissues of the bow a i tere rt 4 lie qopreciendes tac He oor rotaily Vuattenpt to measure bone-tixed radioactive sytem bv mneans of sensitive tilm badges taped elow he knee, over the epiphysis of the tibia oo. pun her of persons, vielded no positive estilts So correlat.on could be obtained between the jegree of miternal contamination and the clini- iin hematological findings. fe possbilit,s that chronic irradiation etfects vr coeeur ts quite small, Thus, an evaluation tthe dara on the internal contamination, indae that of Srey leads to the conclusion that ue internal hazard to the contaminated inhabiasf tae Marshall Islands is minimal both Soon toe secure and the long range point of view. > 4! ison product= were adsorbed mainlyon fairly cre particles, The matertal was 10 percent obible a water. and completely soluble in acid. Interna: deposition of fission products rewired fromaunhalation and ingestion of the fallmtrnateral fangestion appears to be the more miportint of the two routes of entry into the ody The activity in the air settles out fairly audd) out contaminated food, warer and eastis retain their activity for long periods of lhe amount of fission products reaching the roodstregm toreugh the respiratory tract ts a meting of particle size and solubihty of the Atone lay post detonatia i ss ternal hazard, The present stay 0 utaim ootent i the oliser Invade da andmad oe wper ues thea mosr aie: ft radioactive eleme its fe med on tester 1 ove as Che fissile mite ty elt. e tot rend yoy! sorbed fron theo raps ped teeta Tosr Bacand oa tewoat ct were absortecd ter og ot Pty aer ca ee nett tT poe ede gee: Leerree Source of Internal Contamination The farlow material consisted largely of alovamn oxide and calcium carbonate. The beats. wis crlenlated te he gener the uraxeauir cee missible level 65 fer oa sq aebide Nt bare times following expost ie. toa tonger dyed ston product presenp. foe are fest In view of the snort anlf-life of the most abundant fission rmodamets deposited internally in this situation, hype usedoatherips of byperthyresdisr oreareinoma. RADIATION bioorie conpinunants. The particles with Srch The eTavity was associated were conaerably larger than the optimum size for mpestior on the alveolar tissue of the lung. Plas the orebability of the retention of inhaled Crborne contamination wis not appreciable ere fhe exposure period Tlie bvoothesis that imgestion was the chief cor eof anternal confumunation is supported 2 oe ding that the gastre-imtestinal tract, Poconen sad the liver of autopsied chickens pout taht ae deed atearly catervals following