R 325.5261 Appendix A1. Concentrations in air and water above natural background. Elements A and B.

Rule 261. (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) Actinium (89) Ac-227 S 2 x 10-12 6 x 10-5 8 x 10-14 2 x 10-6 I 3 x 10-11 9 x 10-3 9 x 10-13 3 x 10-4 Ac-228 S 8 x 10-8 3 x 10-3 3 x 10-9 9 x 10-5 I 2 x 10-8 3 x 10-3 6 x 10-10 9 x 10-5 Americium (95) Am-241 S 6 x 10-12 1 x 10-4 2 x 10-13 4 x 10-6 I 1 x 10-10 8 x 10-4 4 x 10-12 3 x 10-5 Am-242m S 6 x 10-12 1 x 10-4 2 x 10-13 4 x 10-6 I 3 x 10-10 3 x 10-3 9 x 10-12 9 x 10-5 Am-242 S 4 x 10-8 4 x 10-3 1 x 10-9 1 x 10-4 I 5 x 10-8 4 x 10-3 2 x 10-9 1 x 10-4 Am-243 S 6 x 10-12 1 x 10-4 2 x 10-13 4 x 10-6 I 1 x 10-10 8 x 10-4 4 x 10-12 3 x 10-5 Am-244 S 4 x 10-6 1 x 10-1 1 x 10-7 5 x 10-3 I 2 x 10-5 1 x 10-1 8 x 10-7 5 x 10-3 Antimony (51) Sb-122 S 2 x 10-7 8 x 10-4 6 x 10-9 3 x 10-5 I 1 x 10-7 8 x 10-4 5 x 10-9 3 x 10-5 Sb-124 S 2 x 10-7 7 x 10-4 5 x 10-9 2 x 10-5 I 2 x 10-8 7 x 10-4 7 x 10-10 2 x 10-5 Sb-125 S 5 x 10-7 3 x 10-3 2 x 10-8 1 x 10-4 I 3 x 10-8 3 x 10-3 9 x 10-10 1 x 10-4 Argon (18) A-37 Sub** 6 x 10-3 ---------- 1 x 10-4 ---------- A-41 Sub 2 x 10-6 ---------- 4 x 10-8 ---------- Arsenic (33) As-73 S 2 x 10-6 1 x 10-2 7 x 10-8 5 x 10-4 I 4 x 10-7 1 x 10-2 1 x 10-8 5 x 10-4 As-74 S 3 x 10-7 2 x 10-3 1 x 10-8 5 x 10-5 I 1 x 10-7 2 x 10-3 4 x 10-9 5 x 10-5 As-76 S 1 x 10-7 6 x 10-4 4 x 10-9 2 x 10-5 I 1 x 10-7 6 x 10-4 3 x 10-9 2 x 10-5 As-77 S 5 x 10-7 2 x 10-3 2 x 10-8 8 x 10-5 I 4 x 10-7 2 x 10-3 1 x 10-8 8 x 10-5 Astatine (85) At-211 S 7 x 10-9 5 x 10-5 2 x 10-10 2 x 10-6 I 3 x 10-8 2 x 10-3 1 x 10-9 7 x 10-5 Barium (56) Ba-131 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 Ba-140 S 1 x 10-7 8 x 10-4 4 x 10-9 3 x 10-5 I 4 x 10-8 7 x 10-4 1 x 10-9 2 x 10-5 Berkelium (97) Bk-249 S 9 x 10-10 2 x 10-2 3 x 10-11 6 x 10-4 I 1 x 10-7 2 x 10-2 4 x 10-9 6 x 10-4 Bk-250 S 1 x 10-7 6 x 10-3 5 x 10-9 2 x 10-4 I 1 x 10-6 6 x 10-3 4 x 10-8 2 x 10-4 Beryllium (4) Be-7 S 6 x 10-6 5 x 10-2 2 x 10-7 2 x 10-3 I 1 x 10-6 5 x 10-2 4 x 10-8 2 x 10-3 Bismuth (83) Bi-206 S 2 x 10-7 1 x 10-3 6 x 10-9 4 x 10-5 I 1 x 10-7 1 x 10-3 5 x 10-9 4 x 10-5 Bi-207 S 2 x 10-7 2 x 10-3 6 x 10-9 6 x 10-5 I 1 x 10-8 2 x 10-3 5 x 10-10 6 x 10-5 Bi-210 S 6 x 10-9 1 x 10-3 2 x 10-10 4 x 10-5 I 6 x 10-9 1 x 10-3 2 x 10-10 4 x 10-5 Bi-212 S 1 x 10-7 1 x 10-2 3 x 10-9 4 x 10-4 I 2 x 10-7 1 x 10-2 7 x 10-9 4 x 10-4 Bromine (35) Br-82 S 1 x 10-6 8 x 10-3 4 x 10-8 3 x 10-4 I 2 x 10-7 1 x 10-3 6 x 10-9 4 x 10-5