Measurcnents mace by various investigators Curing the period betwoen March 20-26 are in agreement, Ganna ratio is about 1. It is curious that tho Beta- This would inticato that the bulk of the ash had by thie time penctrated to the porous wood structure of the ¢eck, time atsorbing the Betas, The Gamma raciation over most of the ship was approxinately 40 mr. per hour when the ship arrivag in port. If we extrapolate this back to H # 3 hours, tho time the ash began to fall, the into eratoc Gamma cose is abcut 100 R, Cf course, the ash fac falling from H plus 3 houre to about H plus 9 hours, If we take the mid-point of this Perioc as the start of exposure we find the exposure is about 70 R, This, however, cstinatos the whole body Gamma raciation from residual deoris still on the ship when the first mezsurcemonts were mage, The actual dose could have been 2, 10, or even 100 times higher Gepeniding on how much ash was washed cff the ship =n“ at what time. We have mace a number of discreet inguirics in the hopes that pnotographic film might have beon available atoard the ship and might possi~ Dly be uscd as a dosinmcter. All efforts to date have been negative, Deodosition of Internal Emitters There was an urgent requirement to cvaluste the extent to whieh fission products hac teen absorbec into the tissues of the fishermen. As mentioncee carlier, Dr, Nakaicguni hac concluced from his mouse exporil— ment that the prognosis for the fishcormen was adversely affected by the procability of excessive ceposition of long-lived tone-seeking isotopes, The Japanese scientists were Cesperately lookin: for an agent to mobilize theso isotopes anc Dr. Lewis Selicves that they had acministered EDTA to the pationts, Cespite the fact that urine analysis was beyond their capacility anc they were therefore unable to determine either the neod for EDTA or the offect proiucct by it. Apart from the fact that they wore unable to uncertake urine anslysis at that tinc, it is also evidcnt that they cic not uccerstané the cynamice of fission procuct metabolism and were not used to thinking in terns of urinary oxcretion levels As an incex of atsorption and deposition, They were anxious to providc me with samples of urine for State-sidce apelysis, Two samplos were colivered on March 26 anc five more on March 30, As yet we have not roceivec. samples from the ronaining 16 The samples received were properly forwarded to the Herlth anc Laboratory anc I have hac tho rosults of gross an-lysis of the s*mples, I communicated these rceults to Dr, Kobayashi in the letter which is sclf~cxplanatory, - patients. Safety first two attachec