1 



m w 1 M U i 



P 



These factors are, for each of the subdivisions of the marine en- 

 vironment: 



(1) Zones 1 and 2: harbors, estuaries, inshore waters, and coastal 

 areas within 12 miles of the coastline. 



N = 10 X 1 X 1/3 X 3/10 = 1 



(2) Zone 3a: the outer continental shelf, beyond 12 miles from the 

 shoreline, with depths less than 200 fathoms, in known fishing areas. 



N = 10 X 1 X 1/3 X 3/5 = 2 



(3) Zone 3b: the outer continental shelf, beyond 12 miles from the 

 shoreline, with depths less than 200 fathoms, in regions not designated 

 as known fishing areas. 



N = 10 X 5 X 1/3 X 3/5 = 10 



m 



(4) Zone 4a: the open sea, in known fishing areas. 



N^ = 10 X 2 X 1/3 X 3/4 = 5 



(5) Zone 4b: the open sea, in regions not designated as known fishing 

 areas. 



N^ = 10 X 10 X 1/3 X 3/4 = 25 



The partial permissible concentration in marine foods which may 

 be allowed to result from the disposal of radioactive wastes from 

 nuclear-powered ships is tabulated in Table 2 for each subdivision of 

 the marine environment. As noted in a footnote to Table 2, these calcu- 

 lations have been made on the basis of the mpc's for the general public. 

 These values are lower by a factor of 10 than the occupational vcilues 

 for mpc's given in Handbook 52, and they also include certain revisions* 

 which are to appear in the forthcoming new ICRP and NCRP tables. 



RESTRICTIONS ON THE APPLICATION OF PPC VALUES IN SEAFOOD 

 AND IN THE MARINE ENVIRONMENT 



In applying these ppc values for seafood in the following compu- 

 tation of the ppc's for the various marine environments, and the 



20 



