R 325.5267 Appendix A7. Concentrations in air and water above natural background. Elements R and S.

Rule 267. (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) Radium (88) Ra-223 S 2 x 10-9 2 x 10-5 6 x 10-11 7 x 10-7 I 2 x 10-10 1 x 10-4 8 x 10-12 4 x 10-6 Ra-224 S 5 x 10-9 7 x 10-5 2 x 10-10 2 x 10-6 I 7 x 10-10 2 x 10-4 2 x 10-11 5 x 10-6 Ra-226 S 3 x 10-11 4 x 10-7 3 x 10-12 3 x 10-8 I 5 x 10-11 9 x 10-4 2 x 10-12 3 x 10-5 Ra-228 S 7 x 10-11 8 x 10-7 2 x 10-12 3 x 10-8 I 4 x 10-11 7 x 10-4 1 x 10-12 3 x 10-5 Radon (86) Rn-220 S 3 x 10-7 ---------- 1 x 10-8 ---------- I ---------- ---------- ---------- ---------- Rn-222*** S 1 x 10-7 ---------- 3 x 10-9 ---------- Rhenium (75) Re-183 S 3 x 10-6 2 x 10-2 9 x 10-8 6 x 10-4 I 2 x 10-7 8 x 10-3 5 x 10-9 3 x 10-4 Re-186 S 6 x 10-7 3 x 10-3 2 x 10-8 9 x 10-5 I 2 x 10-7 1 x 10-3 8 x 10-9 5 x 10-5 Re-187 S 9 x 10-6 7 x 10-2 3 x 10-7 3 x 10-3 I 5 x 10-7 4 x 10-2 2 x 10-8 2 x 10-3 Re-188 S 4 x 10-7 2 x 10-3 1 x 10-8 6 x 10-5 I 2 x 10-7 9 x 10-4 6 x 10-9 3 x 10-5 Rhodium (45) Rh-103m S 8 x 10-5 4 x 10-1 3 x 10-6 1 x 10-2 I 6 x 10-5 3 x 10-1 2 x 10-6 1 x 10-2 Rh-105 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 Rubidium (37) Rb-86 S 3 x 10-7 2 x 10-3 1 x 10-8 7 x 10-5 I 7 x 10-8 7 x 10-4 2 x 10-9 2 x 10-5 Rb-87 S 5 x 10-7 3 x 10-3 2 x 10-8 1 x 10-4 I 7 x 10-8 5 x 10-3 2 x 10-9 2 x 10-4 Ruthenium (44) Ru-97 S 2 x 10-6 1 x 10-2 8 x 10-8 4 x 10-4 I 2 x 10-6 1 x 10-2 6 x 10-8 3 x 10-4 Ru-103 S 5 x 10-7 2 x 10-3 2 x 10-8 8 x 10-5 I 8 x 10-8 2 x 10-3 3 x 10-9 8 x 10-5 Ru-105 S 7 x 10-7 3 x 10-3 2 x 10-8 1 x 10-4 I 5 x 10-7 3 x 10-3 2 x 10-8 1 x 10-4 Ru-106 S 8 x 10-8 4 x 10-4 3 x 10-9 1 x 10-5 I 6 x 10-9 3 x 10-4 2 x 10-10 1 x 10-5 Samarium (62) Sm-147 S 7 x 10-11 2 x 10-3 2 x 10-12 6 x 10-5 I 3 x 10-10 2 x 10-3 9 x 10-12 7 x 10-5 Sm-151 S 6 x 10-8 1 x 10-2 2 x 10-9 4 x 10-4 I 1 x 10-7 1 x 10-2 5 x 10-9 4 x 10-4 Sm-153 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 Scandium (21) Sc-46 S 2 x 10-7 1 x 10-3 8 x 10-9 4 x 10-5 I 2 x 10-8 1 x 10-3 8 x 10-10 4 x 10-5 Sc-47 S 6 x 10-7 3 x 10-3 2 x 10-8 9 x 10-5 I 5 x 10-7 3 x 10-3 2 x 10-8 9 x 10-5 Sc-48 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 Selenium (34) Se-75 S 1 x 10-6 9 x 10-3 4 x 10-8 3 x 10-4 I 1 x 10-7 8 x 10-3 4 x 10-9 3 x 10-4 Silicon (14) Si-31 S 6 x 10-6 3 x 10-2 2 x 10-7 9 x 10-4 I 1 x 10-6 6 x 10-3 3 x 10-8 2 x 10-4 Silver (47) Ag-105 S 6 x 10-7 3 x 10-3 2 x 10-8 1 x 10-4 I 8 x 10-8 3 x 10-3 3 x 10-9 1 x 10-4 Ag-110m S 2 x 10-7 9 x 10-4 7 x 10-9 3 x 10-5 I 1 x 10-8 9 x 10-4 3 x 10-10 3 x 10-5 Ag-111 S 3 x 10-7 1 x 10-3 1 x 10-8 4 x 10-5 I 2 x 10-7 1 x 10-3 8 x 10-9 4 x 10-5 Sodium (11) Na-22 S 2 x 10-7 1 x 10-3 6 x 10-9 4 x 10-5 I 9 x 10-9 9 x 10-4 3 x 10-10 3 x 10-5 Na-24 S 1 x 10-6 6 x 10-3 4 x 10-8 2 x 10-4 I 1 x 10-7 8 x 10-4 5 x 10-9 3 x 10-5 Strontium (38) Sr-85m S 4 x 10-5 2 x 10-1 1 x 10-6 7 x 10-3 I 3 x 10-5 2 x 10-1 1 x 10-6 7 x 10-3 Sr-85 S 2 x 10-7 3 x 10-3 8 x 10-9 1 x 10-4 I 1 x 10-7 5 x 10-3 4 x 10-9 2 x 10-4 Sr-89 S 3 x 10-8 3 x 10-4 3 x 10-10 3 x 10-6 I 4 x 10-8 8 x 10-4 1 x 10-9 3 x 10-5 Sr-90 S 1 x 10-9 1 x 10-5 3 x 10-11 3 x 10-7 I 5 x 10-9 1 x 10-3 2 x 10-10 4 x 10-5 Sr-91 S 4 x 10-7 2 x 10-3 2 x 10-8 7 x 10-5 I 3 x 10-7 1 x 10-3 9 x 10-9 5 x 10-5 Sr-92 S 4 x 10-7 2 x 10-3 2 x 10-8 7 x 10-5 I 3 x 10-7 2 x 10-3 1 x 10-8 6 x 10-5 Sulfur (16) S-35 S 3 x 10-7 2 x 10-3 9 x 10-9 6 x 10-5 I 3 x 10-7 8 x 10-3 9 x 10-9 3 x 10-4