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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. Nm = 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. Nn = 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. Nm = 10 x 5 x 1/3 x 3/5 = 10 (4) Zone 4a: the open sea, in known fishing areas. Nm = 10 x 2 x 1/3 x 3/4 = 5 (5) Zone 4b: the open sea, in regions not designated as known fishing areas. Nm Â« 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 values 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