PACIFIC MARINE but it costs the AEC nothing and it covers a wide (continued ) is also another sampling program which brings in SURVEY PROGRAM area because of the number of ships involved. There approximately several pounds of tuna fish a month for Strontium analysis. The levels found are somewhat lower than the milk levels, but are probably less significant. DR. BUGHER pointed out that the figure 7,000 quoted for plankton (phase 4) cannot be compared directly with the figures of about 1,000 found for Troll samples. This could probably be explained by the fact that the Troll survey was conducted a year after the test which may explain the difference because of the time factor. MR. EISENBUD commented that the iodine content might also have been a factor. DR. DUNNING was then introduced in order to describe the criteria of safety for offsite populations at the Navy test site. Dr. Gordon M. Dunning (Much of DR. DUNNING'S discussion involved weapons testing and is therefore classified. ) He pointed out that the NAS has recommended exposure limits of 10 r up to the age of thirty for the general population and 50 r for up to tre age of thirty for the individual. He also said that in the case of populations close NEVADA OFFSITE EXPOSURE CRITERIA to the test site, we are dealing neither with individuals or with the general population and, therefore, the limits should probably be somewhere between the 10 r and 50 r scale. A tentative figure is proposed as 10 r for a ten-year period which he admitted was somewhat arbitrary. The figure of 3.9 r in any one year which has been used previously should be continued because it has a considerable background and has been accepted by the population near the test site as a recognized limit. DR. DUNNING explained that an effort should be made to use these numbers as an operational guide rather than absolute limit, a matter which may present a public relations pro- blem since the general population does not appreciate that slight differences near the exposure limit are immaterial. He told of a number of specific experiences during recent tests in the exposure of certain areas. DR. GLASS commented on the proposal because he felt that geneticists would be the most likely groups to comment on any such proposal. He didn't believe that any geneticists would be concerned about the exposure of any minute fraction of the total population to a level