mental displays for the particular area of interest. These displays, 

 intended mainly for local tactical use, would not require as com- 

 plicated a data processing capability as the master unit. 



THE CHAIRMAN: An anonymous person asks: If various radio- 

 isotopes are concentrated by plankton and other biological systems, 

 what happens to the radioisotopes in organic compounds after the 

 organisms die? 



DR. I. E. WALLEN (AEC): Radioactive isotopes can be expected 

 to behave as stable isotopes. The dead organism decays or is 

 eaten to release the elements for r econstitution by another organ- 

 ism. The actual cycle of r econstitution varies with the element's 

 abundance and the requirements of the species. 



Dilution of the radioactive isotope by stable ones tends to 

 reduce the availability and, thus, the concentration in succeeding 

 steps in the cycle. In addition, radioactive decay and diffusion 

 processes reduce the environmental concentration of the radio- 

 active element of concern. (See also appendix A, page Z36. ) 



THE CHAIRMAN: An anonymous person asks: Has any study 

 been made concerning the possibility of obtaining sedimentary 

 samples with a coring device operating from subnnarines? 



MR. A. C. VINE (WHOI): Yes. On a small scale, an external 

 manipulator can operate a drill or hammer a tube into the 

 bottom from a smiall submarine, or essentially jab a tube or a 

 series of tubes into the bottom to collect small samples near 

 the submarine. A large number of samples could be so taken. 

 They might be very useful, even though no one sample was very 

 long. There has also been sonne discussion about a small 

 submarine supervising a much larger bottomed device which 

 took much larger and longer cores. 



MR. CLIFFORD C. BORDEN (Cur tiss -Wright Corporation): 

 Has any work been done on subsea floor strata profiling by means 

 of an electrical resistivity on ships underway with depths of the 

 order of 6, 000 fathoms of water, plus Z, 500 feet of sediments or 

 bedrock? Would some such device be useful? 



DR. J. L. WORZEL (LGO): So far as I know, no work of this 



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