10 Measuruncnts made by various investigators curing the period between March 20-26 are in agroement, It is curious that tho BetaGanma ratio is about 1, This would incicato that the bulk of the ash had by this time penctratead to the porous woot structure of the ¢ceck, thus atsorbing the Betas, Tho Gamma radiation over most of the ship was epproxinatoly <0 m.r. per hour when the ship arrivag in port. If we extra- polate this back to H 4 3 nours, the time the ash began to fall, tho into eratec Gamma cose is about 100 R, Of course, the ash fas falling from H plus 3 hours 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, cstinates the whole tody Gamma raciation from resi¢ual debris still on the skip when the first messurcements were mage, The actual coso coulc have been 2, 10, or even 100 times higher deyentins on how much ash was washed off the ship en* at what time. We have mace a number of discreet inquirice in the hopes that paotograghic film might have tecn available azoarc’ the ship and might possiDly be uscé as a dosincter. <All cfforts to dato have been negative, Deoosition of Internal Enitters There was an urgent requirement to cvaluste the extent to whieh fission products had been absorbed into the tissues of the fishernen, As mentioned carlier, Dr. Nakaiczumi hac concluded from his mouse expceriment tuat the prognosis for the fishermen was aAdvursely affected bry the prosebility of excessive deposition of lons-—lived tone-seeking isotopes. The Jepanose scientists were Ccesperately lookin: for an agent to -,movilize these isotopes an. Dr. Lewis tclicves that they hed acministerec EDTA to the paticnts, cespitc the fact that urine analysis was beyonce their capability smc they were therefore unable to deternine either the necec for EDTA or the offect orctuced by it. Apart from the fact that they wore unable to undertake urine anclysis at that tino, it is also evident that they Gic not understand the cynanics cf fission procuct metabolism and were not used to thinking in terms of wrinary excretion levels as an inccx of atsorption and ceposition, They wore anxious to provide me with samples of urine for State-—side anelysis. Two samplcs were @colivered on March 26 anc five more on March 30, As yet we heave not reecivec samples from the ronaining 16 patients. The samples reccived were propcrly forwarced to the Health ant Safety Laboratory anc I have had the results of gross an-lysis of the first two s-mples. I communicatod these rcsults to Dr. Kobayashi in the attachec letter which is sclf—cxplanatory,.