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?ollowlng our Wmwsionm on tti plane axnlis Eonohlu I aqreed to make a quick cheekof the predlctmne of exp8ure8 thd w be gemxrd public. See ‘lkbleVI of his ~ 1968 repurt. intake numbers f= l~C!a d far 9% (depeti~ on the cakhm intake) mere is one additionalammary repartthat uaa an ap*@ix to the to !hble VI exoeptoertafs t- hme h atttad fraa the table since I could see no wag of reducing the% eqmsure shurt of Flaclng restriatlons on intake of fish. that Gnetafmn’s predieted five year total whole body dose number may be a little M@. For exmple, the 5 year eontrtbutlonto whole the diet when the natkes fbwt return sfnce the mrveys have ixxiicated m ediblevarietyof this food is mailmble much lass a efficient qwn%ity of the edible type to meet the made of the returningnatives. BEST COPY AVAILABLE
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fQ’#Yr@~*-**~=~ Vith the value fw adata. I wighttbat oeeurover that perladslmatlm curve lal?Qur840f * wxmree, it my be wrthwtd.lete agatireview the bternal expcumre queattoaat * end d cleanupoperatioa,partfeuhrly if addltiond mmplee of items d’ the diet are takenand ~ and baae-linebady is Cul@eted am that the atoll in ready far return 03 * -ttcm.
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T !ly Radionuellile Intske Associated With The Maximum Permissible Max. permissible burden, Fw’ conditions of continuous intake, the daily intake associated witKa Et “n equilibrium organ burden can be determined fran the following: Equilibrium organ burden Mean time in reference organ Fraction of intake reaching reference organ through ingest~~m Preferences me} (1) Report of ICRP Committee II as pu~lished in Health physics, June 1960,and (2) AEC 0524, June 1967. ,:., .,..!
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~+.k;e18. The value 200 pCi/day comes from an arbitrary reduction by a t’artor of three (see para 4.24, page 17) of the value 600 pCi/day that 1s actua~ ly equivalent to the RIG. It is assumed, however, that there Is f;t~eBikinians dontt have. With a calcium intake of 0.42 grams per day, I.heguides would be about 250 and 750 pCi/day. The Ad Hoc Cunmittee has recommended adding calcium to the Bikini diet. Max. permissible whole body burden, occupational exposure, 3 x 103 uCi IT If II !1 11 individual in pop., 3 x lF MCi Ft”)’ecti%~half-life is 463 days. Fraction reaching organ is 0.1 This differs considerably
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~.t.-~;;~n. Gustafson probably used rather than whole body whole body so that the as the critical doses would be AEC Manual Chapter 0521 which treat 95;ef;;s;a~ ~8c;i;$~1V;7;gives an uncontrolled area MPC for !f:l~fii;:ym;’ )“ The value for the general public would be . Assuming an intake on a per day basis we have: s TII1ls,even for the spleen, the dietary value of 59,500pCi/dayIn Table VT’ is only about 1/5 of the MR. . At,eql,;,libriumthe initial body burden would be: Initial dose rate would be: Dose -:Initial dose rate This is about one half of the Table VIIt five year dose for .
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55FeThis is about one fifth of the Table VII’ five year dose for . Fe dose to spleen** ‘l_’hedj’t of the young child, 1 to 2 years of age, will be different I’romt!at of adults, but if the intake were as high as 2,290 pCi/day, the fC;-IIOWing body burden would be obtained: “ MPC tuken from ICRP Committee II
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~’},~.Wh(,le body dose would be: ‘L’husthe 5 year dose would be about 276 mad which is not significantly ~:r~ater than the dose to the adults from 137(7s.
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Division of Biology and Medicine :I!.vi’raltypes 01 detectors. The external radiation field was mapped- in con- ., ldcrablc detail on Bikini and Eneu Islands, and less thorougtlly on the rvmoinder Oi Lhe atoll. . The various radionuclides and their concentrations wilich gave rise to EIICobserved radiation field were clctermincd frQm field ~;t;mma-ray spectrometry. Representative samples of local plants and animais .t,ich iillgl~tbe eaten by the returning L~ativcs were collected and have been TIIC results of the 1967 survey provide a basis for making reasonable t~~cBikinians might receive over t[lccoining years, if they re~urn to the c(>smic radiation, and there are only trace amounts of the naturally CIt-(IIrrl[t, t_.ldioelrmeL]tsin the area. EXCepL in the immediate viciniLy oi nuclear .;imilar throughout the atoll, consisting of about 70% 137c~ , ~c)Piac<;; EIICU was the least contaminated, followed by IiilciniIsland its(’li
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:;,>~i~,.... oi the possible daily intalcc of the abOVC tllrce radionuclid(s may bL’,j’bta~ncdby taking the diet eaten by the Rongelapese as a guide, anti tls~k):: ttie Obst’rv\.)concentrations OE radioactivity in the same iood itcm:; a rl’ compared wiLl~ the daily intakes which will lead to acceptable body bljrd,ns LO:” individ~l,)lsLIICIa suitable sample of the population. Speciai proctidurcs 90.;.i,’i]WL1l greatly reduce the Sr content of the fruit can be undertaken , i-tlL~ would be available about five years after planting. The fact that ~,d~”uLepandanus fruit will not be available for several yearq removes what ,, mii:ht l~ave been tilemajor source of 90Sr intake and materially 1~7Cs in~ake as well. Removal also of land crab meat from Lhe Doses to the whole body from 137Cs and 55,-rL were calculated assuming Cilrlt ,,.:..]i>tllisin,adults and children were considered separately for internal dose ,)(lr,)u:;cs, The tot.11 doses to wilole body and to bone for children and ad~(ts in 1970 are indicaccd in Table 4. The doses acceptable for individual.and .. . .. iur a suitable sample of the population during the same time intervals ar.
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Tlw estimated 90Sr dose to bone is maximal because additions of coici~. Li)c diet could readily rcducr 90 ..l~)its , the dose to .IIC whole body or to bone will reach 2 rads in 5 years, .0 r~ds in 3L)years OF 16 rads in 70 years.
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