Sq) Fontrowing A NUCLEAR dete Introduccion ation ai he spring ~ sublethal external gamma iiat ono xposure and beta irradiation fo toe -kia. delectal » amounts of radionue ides ere tepasited 1 ternally. It has beer assa ee cunt 2 los ti ations resulting from) contami ngeevertet ratio of external to a terus tose voided Je ee eeedingly high. the internal Hovever, contami matic dete led study f Pb >A DOSE human populat.on ant oto: chines was cede determine the kind am teeres of omrern | deposition, Tliree generui protdems ‘sere 1 vestigated: (1) The « eterr mateo of the cor tribution of the interii tip oation te Chie acute vadiation synd ome observed 24 Poe possibility of Jong term efecs one 3 Poe qualitative and quantitative Gature ot thes ternal contamination prod ea ts exposure individuals to mixed fis-ic Dew was NO previous situation f There Wats, - pea brant bee ings were exposed fooathoeP roripent 1 ontani nated with mixed fissile oroduets. Cloned rent studies were undertaker oo he. ip iness, however, on radioact ve ou teal teste. 4 small group of Japanese sterner near Ronee lap at the time of the deten tier. ere exposert The report of the exter ye iwestegations undertaken on the asnes The Papanese cri. e been published (4) Evaluation of the ytern, core uminatiar Ff the human beings wa crack fx pastiche et toe radioelements excrete | mation is presently \ ery isn deo atthe fe 6 ceert ong toe ratio of excreted rad oelem en shi ummouet deposited in the body ft 4 < iecessurs te the evaltation on data eat ined from whieh aren event. had been cortunmys Detagled -tuce. ct 7 base vrei < the snap putea foesnes ard animal exereta foen oresd ee estimates of the foam ce vain oor vba gy ee te General Nature of Internal + of 1954. a large group oof peapie were oonfan nated with fission product bo oatdit or tea Radiation Toxicity Poa Nett awk OF the radiation hazard from inrere tis deposited fissron products can best be bet rstood in rermns of the biophesreal behavior fry ytronte hes, Posse oroduers enterme the body through Pp Tyee Pthrod te oor meestion conmeentrate on Vitrlous as sourees Gf internal radiation. ut abo Porch Loy of a mehonucide to enter the blood “teen, s detectiined bx its sotubility, chemical Proareroes and myes os Ha. tive oa dimuited solubiltty on body othas basis, oniy a few of the radio- bal puysieal stare. “Phe radioele- Formed oi tsston are predominantly oxob bo elements oun become available to the body. lta He ouneant wach can produce im- BY booms eddeets whe: deposited within the body trate beenuse of the close proximity of the feote pe foe tie tissues it ceradiates, and because ‘Le sorope continues to irradiate these tissues sat "as remeved by bielogieal turnover or is retpered barpiless by radioactive decay. ete 6 cot The adation from internuly deposited Pho tee 4 @ the -me as those from external hob oa Toe cistineiishing feature of inhora nlite be wever. ists long continuing Peyeconae Peo ove Setopes ! p poresses we ne follow the same me- oa the bods as the naturally native satopes of the same element ' oc oenaeally stmiar elements. Thus Trout thy viet bariam. whieh are analogous Pero adiy to cate nm, are deposited in the ealrey " pour ~neof the bone. Although nearly two as moat dieisotapes ure produced im the fs- "OM Bes, thor mds 1 few mre ta aon aazards. Pooh potential ehronic These fission prod- apes sted in Table 3.1, constitute a eon oer tase od the Lssion vield. and localize : ape Vhe hone seekers” have. 67 i