ships, and applied research ships) - 19 to 22- 



b. Certain activities within scientific community - 12 to 20. 



c. U. S. Coast and Geodetic Survey - 8- 



d. Bureau of Commercial Fisheries - 2 to 20- 



Total: 41 to 70. 



Recommendation Where Instrument Should Be Researched and 

 Developed: 



U. S. Industry. 



Relative Importance to U. S. Nat ional Oceanographic Program: 



Individual instrument/equipment priority 12. 



I.m. SHIPBOARD GAMMA RAY DETECTOR OF NUCLEAR 



WASTE IN THE SEA 



Primary Use: 



To be utilized on oceanographic survey ships for identifying 

 and measuring abnormal gamma ray concentrations in the ocean 

 areas, such as would result from nuclear powered vessel refuse 

 and special concentrations from other sources, such as nuclear 

 waste dumping grounds and experimental nuclear tests conducted at 

 sea. 



Requirements and Specifications : 



a. To perform reliably in depths of water varying from 0-6, 500 

 fathoms, in both coastal and oceanic regions. 



b. Sampling operation to be conducted with the ship stopped 

 ("lying-to") and when underway. 



c. Sensor module should contain, for example, a pressure pro- 

 tected 6 in. by 9 in. sodium iodide or plastic scintillating crystal 



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