R 325.5265 Appendix A5. Concentrations in air and water above natural background. Elements M to O.

Rule 265. (See notes in Rule 270.) TABLE I TABLE II Element (atomic number) Radionuclide* Column 1 Air (µCi/ml) Column 2 Water (µCi/ml) Column 1 Air (µCi/ml) Column 2 Water (µCi/ml) Manganese (25) Mn-52 S 2 x 10-7 1 x 10-3 7 x 10-9 3 x 10-5 I 1 x 10-7 9 x 10-4 5 x 10-9 3 x 10-5 Mn-54 S 4 x 10-7 4 x 10-3 1 x 10-8 1 x 10-4 I 4 x 10-8 3 x 10-3 1 x 10-9 1 x 10-4 Mn-56 S 8 x 10-7 4 x 10-3 3 x 10-8 1 x 10-4 I 5 x 10-7 3 x 10-3 2 x 10-8 1 x 10-4 Mercury (80) Hg-197m S 7 x 10-7 6 x 10-3 3 x 10-8 2 x 10-4 I 8 x 10-7 5 x 10-3 3 x 10-8 2 x 10-4 Hg-197 S 1 x 10-6 9 x 10-3 4 x 10-8 3 x 10-4 I 3 x 10-6 1 x 10-2 9 x 10-8 5 x 10-4 Hg-203 S 7 x 10-8 5 x 10-4 2 x 10-9 2 x 10-5 I 1 x 10-7 3 x 10-3 4 x 10-9 1 x 10-4 Molybdenum (42) Mo-99 S 7 x 10-7 5 x 10-3 3 x 10-8 2 x 10-4 I 2 x 10-7 1 x 10-3 7 x 10-9 4 x 10-5 Neodymium (60) Nd-144 S 8 x 10-11 2 x 10-3 3 x 10-12 7 x 10-5 I 3 x 10-10 2 x 10-3 1 x 10-11 8 x 10-5 Nd-147 S 4 x 10-7 2 x 10-3 1 x 10-8 6 x 10-5 I 2 x 10-7 2 x 10-3 8 x 10-9 6 x 10-5 Nd-149 S 2 x 10-6 8 x 10-3 6 x 10-8 3 x 10-4 I 1 x 10-6 8 x 10-3 5 x 10-8 3 x 10-4 Neptunium (93) Np-237 S 4 x 10-12 9 x 10-5 1 x 10-13 3 x 10-6 I 1 x 10-10 9 x 10-4 4 x 10-12 3 x 10-5 Np-239 S 8 x 10-7 4 x 10-3 3 x 10-8 1 x 10-4 I 7 x 10-7 4 x 10-3 2 x 10-8 1 x 10-4 Nickel (28) Ni-59 S 5 x 10-7 6 x 10-3 2 x 10-8 2 x 10-4 I 8 x 10-7 6 x 10-2 3 x 10-8 2 x 10-3 Ni-63 S 6 x 10-8 8 x 10-4 2 x 10-9 3 x 10-5 I 3 x 10-7 2 x 10-2 1 x 10-8 7 x 10-4 Ni-65 S 9 x 10-7 4 x 10-3 3 x 10-8 1 x 10-4 I 5 x 10-7 3 x 10-3 2 x 10-8 1 x 10-4 Niobium (41) Nb-93m S 1 x 10-7 1 x 10-2 4 x 10-9 4 x 10-4 I 2 x 10-7 1 x 10-2 5 x 10-9 4 x 10-4 Nb-95 S 5 x 10-7 3 x 10-3 2 x 10-8 1 x 10-4 I 1 x 10-7 3 x 10-3 3 x 10-9 1 x 10-4 Nb-97 S 6 x 10-6 3 x 10-2 2 x 10-7 9 x 10-4 I 5 x 10-6 3 x 10-2 2 x 10-7 9 x 10-4 Osmium (76) Os-185 S 5 x 10-7 2 x 10-3 2 x 10-8 7 x 10-5 I 5 x 10-8 2 x 10-3 2 x 10-9 7 x 10-5 Os-191m S 2 x 10-5 7 x 10-2 6 x 10-7 3 x 10-3 I 9 x 10-6 7 x 10-2 3 x 10-7 2 x 10-3 Os-191 S 1 x 10-6 5 x 10-3 4 x 10-8 2 x 10-4 I 4 x 10-7 5 x 10-3 1 x 10-8 2 x 10-4 Os-193 S 4 x 10-7 2 x 10-3 1 x 10-8 6 x 10-5 I 3 x 10-7 2 x 10-3 9 x 10-9 5 x 10-5