32. 



miles per day; (e) longshore non-tidal drifts in the area from Cape 

 Hatteras to Georgia that may reach 12 miles per day; (f) a southerly 

 drift from Georgia to Daytona Beach; and (g) a northerly drift along 

 the coastal area south of Daytona Beach. 



The lack of detailed knowledge of circulation in the areas that 

 have been selected as disposal areas makes necessary the recommen- 

 dation that detailed studies be conducted in these areas before disposal 

 is started. 



More information concerning the extent to which marine organisms 

 can concentrate radioactive substances from sea water is available now 

 than at the time Publication 551 was conceived. This information is 

 summarized in Appendix VI, Table I, where it provides a necessary 

 piece of information for the calculation of maximum permissible con- 

 centration of the various radioisotopes in sea water. This is defined 

 as the concentration in sea water that will contaminate the edible parts 

 of fish or shellfish to such an extent that should these fish be the sole 

 source of protein for an individual, he would receive an amount of 

 activity equal to that received by drinking fresh water at MPC levels. 

 The consumption levels used in these calculations are 15 liters of 

 water and 1. 5 kilograms of fish per week. Also listed are the volumes 

 of sea water necessary to dilute to MPC levels the quantities of non- 

 sealed source isotopes that have been produced by Oak Ridge during 



