age } “his document consists ad & pr FE_ of 6 canter, sortes A= John C. Bugher, BH. D., Director Oo , Division of Biology and Fedieine- - “ Rotert'A;Dudley; Blophyaics Branch’ - _ September 16, 195k | | LE vision @fBiologyand Nedteine Pee 7 o_ Di COMPUTATION OF T-132 DosE Ta HUMANEONS RESULTING‘FROM‘casTLE yo take AOR FAO ; 2 7 FALLOUTTHOS wha s poges | (OE eS ne a data the I-131 dose in human thyroids resulting from CASTLE.:: wee hee DBM Files .. Ir,. Dunninghas asked ne : to compute for you‘trom.theavailable fallout in the U. S. I estizate the total dose to have‘been - ~ less than 1.5 rep, as compared with the present maxim m permis sible dose per year, of 15 reps (0.3 rep, wi) oe, - the basis of‘theealeulationwasas followstOSES ae ) 7 Ghsorvations on Tyroia Activities . peonyos oe ee) ot case . is TeRoy’ measured 4 humains‘tiyroidsffrom Grtcago‘autopsiesty _ | scintillation counting, Asof July 12, 195h, activities - & LO We oy ao i ‘ GUALis ma VPOAEC ENERGY SHEEDfat BESTCOPYAVAILABLE. ole Judging from half-life, pat ““ ranged from 0.5-1.6 x “the activity was quite deffnitely I-131, Dr. Dunham believes the local hospital I~131 contamination mignt possibly > be the . ‘source, rather than fallort. o a ae "2 ony Harley measured 1human ‘thyroid from N.Y. after digestion a hs and chemical separation of I, This. technique gave high“ ce - sensitivity but Harley is not positive of 100% recoverys.: Ho" I-131 wasdemonstrated, and an upper limit of activity was| be estinated at,About 28.Anat observed byLeRoys Sot fotax us PoE Ra. oats a 3. Léonsy’and ‘Golodatia ‘at,‘fag’‘measured several ‘human thyroids from Washingtonby’ scintillationcounting. theix Yesul were’ negative,¥with an upper limit of about ve LeRoy}s value. ae ; . fo: ks raus h, Hardin Jones has observed I-131 in the urine of some zitiente in San Francisco,none in other patientas.Bis» flere. ane. not yet‘available to me. . Po ae oo vee S. Van Kiddlesworth, Hardin Jones, aand1 othgs% ‘peadured“ 8 activity of cattle, seep, hog, and dog thyroids ia Junez On cattle and sheep their results ( polated fo July 12: LeRoy's date) were approximatelyte same aa LeRoy"sa Van6S Widdlesrorth found hogs and dogs to contain much lesa. - orrice» Buppfounddogs approxindtely as high jas cattle,et . SURNAME > = DUDLEY: s/sAe D DATE > 5 ay __ ‘ ' ™ @. 8. GOVERNMENT PRIKTING OFFICE NG : 16—62761-8 Historian’s Office" nee AROMOS ‘ I -AS Ae : Lobe a”