-«e “a . Measurements .; by various investigators during@he 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 m.r. per hour when the ship arrived in port. If we extra- polate this back to H # 3 hours, the time the ash began to fall, the into~ grated 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.Theactualdose could have been 2, 10, or even 100 times higher depending on how much ash was washed off the ship and at what time. We have made a number of discreet inquiries in the hopes that photogrephic film might have been available 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 fission products had been absorbed into the tissues of the fishermen; As mentioned earlier, Dr. Nakaidzumi had concluded from his mouse experi~ ment that the prognosis for the fishermen was adversely affected by the probability of excessive deposition of long-lived bone-seeking isotopes. The Japenese scientists were desperately looking for an agent to mobilize these isotopes and Dr. Lewis believes thet they had administered EDTA to the patients, despite the fact that urine analysis wes beyond their capability and they were therefore unable to determine either the need for EDTA or the effect produced by it. /part from the fact that 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 an index of absorption and deposition. They were anxious to provide me with samples of urine for State-side analysise Two samples were delivered on March 26 and five more on March 30. As yet we heve not received samples from the remaining 16 patients, 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-expi:natory. 10