shellfish, thereby creating a potential hazard to man in his food supply. 



Approximately twenty locations along the Atlantic and Gulf 

 coasts of the United States are suggested as possible disposal areas. 

 On the basis of information presently available it has been concluded 

 that any one of these locations could have received the radioactive iso- 

 topes (measured at the time of shipment, omitting sealed sources) 

 shipped to licenced non -governmental activities in the area east of the 

 Mississippi River, plus the states of Texas and Louisiana, during the 

 period January 1956 to September 1957, under the condition that the 

 rate of disposal with immediate release to the water was equal to the 

 rate of shipment from Oak Ridge. This conclusion appears to be valid 

 for rates of production that have been estimated for the next five years. 



Hazard level is based upon the recommendations of the National 

 Committee on Radiation Protection (4). 



Maximum permissible concentrations of various isotopes in sea 

 water have been calculated. These are the concentrations that will 

 supply to man, by the ingestion of marine fish or shellfish, the same 

 quantity of activity that he would receive by drinking water having 

 presently accepted MPC quantities. The maximum permissible sea 

 water concentrations (PSC) also provide a measure of the extent to 

 w^hich any quantity of a given radioisotope must be diluted with sea 

 water in order that it be a non-hazardous habitat for fish or shellfish 



