58 



Atomic Radiation and Oceanography and Fisheries 



1948). Recent evidence indicates that the or- 

 ganisms are almost always present in the water 

 (Collier, A., unpublished), but in such low 

 concentrations that there is no marked fish 

 mortality. It is only after the concentration 

 produced by the biological and hydrographic 

 system that mortalities result. 



In evaluating the discharge of radioisotope 

 wastes at sea, the factor of safety must be 

 sufficient so that safe levels of radioactivity can 

 be maintained, even after the various mecha- 

 nisms of biological accumulation. 



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