UNCLASS Measurements made by various investigators during the period between March 20-26 are in agreement. It is curious that the Beta- Gamma ratio is about 1. This would indicate that the bulk of the ash had by this time penetrated to the porous wood structure of the deck, thus absorbing the Betas. The Gamma radiation over most of the ship was approximately 40 mer. per hour when the ship arrived in port. If we extrapolate this back to H # 3 hours, the time the ash began to fall, the intograted Gamma dose is about 100 R. Of course, the ash was falling from H plus 3 hours to about H plus 9 hours. If we take the mid-point of this period as the start of exposure we find the expogure is about 70 R. This, however, estimates the whole body Gamma radiation from residual debris still on the ship when the first measurements were made.Theactual”dose could have been 2, 10, or even 100 times higher depending on how much ash was washed off the ship end at what time. We have made a number of discreet inquiries in the hopes that photographic film might have been aveilable aboard the ship and might possibly be used as a dosimeter. All efforts to date have been negative. Deposition of Internal Emitters There was an urgent requirement to evaluate the extent to which sae fission products had been absorbed into the tissues of the fishermen, As mentioned earlier, Dr. Nakaidzumi had concluded from his mouse experiment that the prognosis for the fishermen was adversely affected by the probability of excessive deposition of long-lived bone-seeking isotopes. The Japanese scientists were desperately looking for an agent to mobilize these isotopes and Dr. Lewis believes that they had administered EDTS/ to the patients, despite the fact that urine analysis was beyond their capability and they were therefore unable to determine either the need for EDTL or the effect produced by it. /part from the fact thet they were unable to undertake urine analysis at that time, it is also evident that they did not understand the dynamics of fission product metabolism and were not used to thinking in terms of urinary excretion levels as en index of absorption and deposition. : They were anxious to provide me with samples of urine for State-side analysis. Two samples were delivered on Merch 26 and five more on Merch 30. As yet we have not received samples from the remaining 16 paticnts. The samples received were properly forwarded to the Health and Safety Laboratory and I have had the results of gross analysis of the first two samples. I communicated these results to.Dr. Kobayashi in the attached letter which is self~exp:“natory. seconcnuaentangoe