236 THE SHORTER-TERM BIOLOGICAL HAZARDS OF A FALLOUT FIELD that a tremendous amount of kinetic data on the relationship of not only strontium-90, but all of the substances that are in fallout in re- spect to the availability, uptake, retention and circulation in all of the biological cycles that eventually lead into the food chain are essential before one can have an adequate model to evaluate hazards. I need only comment on Dr. Terrill’s talk that the gist of his statement is the sort of thing that I personally feel should be disseminated widely in the appropriate form to the public. In concluding the summary, and although instrumentation was not a part of this sym- posium——it was deliberately not a part of this symposivm—I can’t but have the feeling that instrumentation development, manufacture and useis going ahead without, at this time, sufficient delineation of the real biomedical problems that need to be known. Perhaps further study of the instrument side should be gone into and further evaluation of what docs one really need to know from an instrument before another instrumentation development program with its tremendous expense of time and money is entered into. In concluding, I would lke to say that this symposium has been most valuable and educational to me, and on behalf of all of you, I would like to thank Dr. Dunning and Col. Maxwell for organizing it. [Applause.] (US GOVERNMENT PRINTING OFFICE 1858 448029