OFFICIAL USE OF".Y The final scientific presentation was by Dr. D. Manowitz, of the Department of Applied Science. Dr. Manowitz is with the Meteorology eroup which has recently been transferred to this department. Their werk in the past has been concerned with the dispersion of plumes from smokestacks and they have examined in detail the kinetics of the dispersion for distances up to 10 kilometers. At the present time they are extending the range of their studies up to 100 kilometers, DirManowitz pointed out that existing equations for estimating concentrations in plumes as a function of distance are not adequate because they do not take into account wind shear, turbulence and certain other variables. The effect of these variables becomes increasingly important with increasing distances from the release point. They are trying to improve prediction equations. This has required the development of very sophisticated instrumentation to enable the tracking of very small quantities of sulfur hexafluoride and particulates at long distances from the release point. The sulfur hexafuloride of course is not a naturally Occurring component of stack effluents but is injected into the source plume as a tracer. The group is also investigating the problems associated with plumes that might be released from nuclear reactors sited off-shore. There apparently is the real possibility that the on-shore sea breezes might bring the plume directly in and that it might be very narrow. This, of course, would result in high concentrations within the plume itself. An additional area of study concerns the rate of oxidation of sulfur dioxide in plumes. If it oxidizes this, of course, influences the concentration with time und distance. One of the reaction products, unfortunately, is very likely sulfuric acid but the rate of this reaction may very well vary with atmospheric conditions. Ammonium sulfate has also been identified as a reaction product from the sulfur dioxide. This concluded the scientific presentations and the Committee recessed for the day. The Committee reconvened at 7:20 A.M. for its executive session. Dr. Robert Conard, who for years has headed the team that periodically examines the natives on Rongelap who were accidentally exposed to fallout radiation, reported that this year his team was not permitted to examine these people. A representative in the Congress of Micronesia named Mr. Balos has charged that the United States is using the natives as guinea pigs, is more interested in the effects of the radiation that in treating the patients, and that the U.S. has been less than generous in its financial settlements with the natives. He was able to exert sufficient pressure to intimidate the Rongelap people into refusing examination. This seems very unfortunate because Dr. Conard and his team bring to the natives a level of medical care otherwise unavailable to them. Mr. Balos was aided and abetted in his attack on the U.S. by some left wing Japanese scientists and observers who had come to the islands to see the natives. It is not at all clear whether or how this problem will be resolved. The natives and particularly those with hypo function of the thyroid gland need continuing surveillance. With the OFFICIAL USE ONLY