out is the importance of coordinating, not only on a U.S. basis but on an international basis if possible, the introduction of isotopes so that we don't run out of possible tracer materials for basic geophysical experiments. Dr. Shreve: I personally feel that this idea of coordinating injections is going to become more and more important. Otherwise, the few first-jumpers will be served at the cost of putting everybody else out of business. Dr. Fleming: LRL is interested in these things more from a general scientific nature, I should say, with the possibility of one exception. Our Plowshare program may eventually get involved in something like this. about outer space shots for purely fundamental research: like, We have thought such things as measuring neutron scattering and the I can't say anything about the schedule on this; it depends a lot on Khrushchev, I suppose, meeting is concerned, I think it has been one of the most interesting I have ever attended. As far as this I have learned a preat deal here, and, in particular, I think we all owe a vote of thanks to Jim Shreve for organizing it so well. Dr. Shreve: Thank you. We have tried to create an informal atmosphere, and you took it from there. success of the meeting is obviously a function of the participants. I think the real J would like now in reverse to express my thanks to you. Cmdr, Elam: Iam from the Atmospheric Physics Branch of ONR, I came here primarily to see what was likely to be added to the knowledge of the region up to 100 kilometers by additional probes that might be made to meet the requirements that have been set forth here. in sampling radioactive material, We are more interested in scientific knowledge of the region than We intend to make geophysical sampling of this region and weare vitally interested in greater sampling of the region, Dr. Schwob: I have a wild idea that I would like to try out. I happened to have started in chemistry before radio- activity became popular, so I have some old fashioned ideas. One that occurred to me is the idea of using chemical rather than physical means for collecting samples. In qualitative analysis you had to separate materials in groups and then into finer subdivisions and then identify them. In radiochemistry we use a lot of these principles, but we don't use the chemistry for the actual identification or the actual detection of new material; we use radioactivity because the sensitivity is greater. I am proposing to use somewhat the same scheme during the collection, not for detection but for collection and for discriminating between items, Perhaps some day a shorter life material may be amenable to such a method. stages. In fact, you may have successive I can visualize rather vaguely, but somewhat concretely, a few simple chemical steps that should be possible in the sampling device which would help to fix such things as single molecules that might be difficult to collect otherwise. They might be converted to compounds which would spread to a certain surface, like you people to think about this and tell me I am a fool or maybe get something out of it. I'd In answer to your specific questions, my particular outfit, which is NRDL in San Francisco, is interested just now mainly in 175