R 325.5271 Appendix B. Reference quantities for posting and disposal

Rule 271. Radionuclide Microcuries Americium 241 .01 Antimony 122 100 Antimony 124 10 Antimony 125 10 Arsenic 73 100 Arsenic 74 10 Arsenic 76 10 Arsenic 77 100 Barium 131 10 Barium 133 10 Barium 140 10 Bismuth 210 1 Bromine 82 10 Cadmium 109 10 Cadmium 115m 10 Cadmium 115 100 Calcium 45 10 Calcium 47 10 Carbon 14 100 Cerium 141 100 Cerium 143 100 Cerium 144 1 Cesium 131 1,000 Cesium 134m 100 Cesium 134 1 Cesium 135 10 Cesium 136 10 Cesium 137 10 Chlorine 36 10 Chlorine 38 10 Chromium 51 1,000 Cobalt 58m 10 Cobalt 58 10 Cobalt 60 1 Copper 64 100 Dysprosium 165 10 Dysprosium 166 100 Erbium 169 100 Erbium 171 100 Europium 152 (9.2h) 100 Europium 152 (13yr) 1 Europium 154 1 Europium 155 10 Fluorine 18 1,000 Gadolinium 153 10 Gadolinium 159 100 Gallium 72 10 Germanium 71 100 Gold 198 100 Gold 199 100 Hafnium 181 10 Holmium 166 100 Hydrogen 3 1,000 Indium 113m 100 Indium 114m 10 Indium 115m 100 Indium 115 10 Iodine 125 1 Iodine 126 1 Iodine 129 0.1 Iodine 131 1 Iodine 132 10 Iodine 133 1 Iodine 134 10 Iodine 135 10 Iridium 192 10 Iridium 194 100 Iron 55 100 Iron 59 10 Krypton 85 100 Krypton 87 10 Lanthanum 140 10 Lutetium 177 100 Manganese 52 10 Manganese 54 10 Manganese 56 10 Mercury 197m 100 Mercury 197 100 Mercury 203 10 Molybdenum 99 100 Neodymium 147 100 Neodymium 149 100 Nickel 59 100 Nickel 63 10 Nickel 65 100 Niobium 93m 10 Niobium 95 10 Niobium 97 10 Osmium 185 10 Osmium 191m 100 Osmium 191 100 Osmium 193 100 Palladium 103 100 Palladium 109 100 Phosphorus 32 10 Platinum 191 100 Platinum 193m 100 Platinum 193 100 Platinum 197m 100 Platinum 197 100 Plutonium 239 .01 Polonium 210 0.1 Potassium 42 10 Praseodymium 142 100 Praseodymium 143 100 Promethium 147 10 Promethium 149 10 Radium 226 .01 Radon 222 .01 Rhenium 186 100 Rhenium 188 100 Rhodium 103m 100 Rhodium 105 100 Rubidium 86 10 Rubidium 87 10 Ruthenium 97 100 Ruthenium 103 10 Ruthenium 105 10 Ruthenium 106 1 Samarium 151 10 Samarium 153 100 Scandium 46 10 Scandium 47 100 Scandium 48 10 Selenium 75 10 Silicon 31 100 Silver 105 10 Silver 110m 1 Silver 111 100 Sodium 24 10 Strontium 85 10 Strontium 89 1 Strontium 90 0.1 Strontium 91 10 Strontium 92 10 Sulfur 35 100 Tantalum 182 10 Technetium 96 10 Technetium 97m 100 Technetium 97 100 Technetium 99m 100 Technetium 99 10 Tellurium 125m 10 Tellurium 127m 10 Tellurium 127 100 Tellurium 129m 10 Tellurium 129 100 Tellurium 131m 10 Tellurium 132 10 Terbium 160 10 Thallium 200 100 Thallium 201 100 Thallium 202 100 Thallium 204 10 Thorium (natural) 100* Thulium 170 10 Thulium 171 10 Tin 113 10 Tin 125 10 Tungsten 181 10 Tungsten 185 10 Tungsten 187 100 Uranium (natural) 100** Uranium 233 .01 Uranium 234 - 235 .01 Vanadium 48 10 Xenon 131m 1,000 Xenon 133 100 Xenon 135 100 Ytterbium 175 100 Yttrium 90 10 Yttrium 91 10 Yttrium 92 100 Yttrium 93 100 Zinc 65 10 Zinc 69m 100 Zinc 69 1,000 Zirconium 93 10 Zirconium 95 10 Zirconium 97 10 Any alpha emitting radionuclide not listed above or mixtures of alpha emitters of unknown composition 0.01 Any radionuclide other than alpha emitting radionuclides not listed above or mixtures of beta emitters of unknown composition 0.1 *Based on alpha disintegration rate of Th-232, Th-230 and their daughter products. **Based on alpha disintegration rate of U-238, U-234 and U-235. NOTE: For purposes of Rules 224 to 231, where there is involved a combination of nuclides in known amounts, the limit for the combination should be derived as follows: Determine, for each nuclide in the combination, the ratio between the quantity present in the combination and the limit otherwise established for the specific nuclide when not in combination. The sum of such ratios for all the nuclides in the combination may not exceed “1” (i.e., “unity”).