Federal regulations · Through 2026-08-25 · Newer source version available

10 CFR Appendix C to Part 20: Appendix C to Part 20—Quantities 1 of Licensed Material Requiring Labeling

Radionuclide Quantity (µCi)
Hydrogen-3 1,000
Beryllium-7 1,000
Beryllium-10 1
Carbon-11 1,000
Carbon-14 100
Fluorine-18 1,000
Sodium-22 10
Sodium-24 100
Magnesium-28 100
Aluminum-26 10
Silicon-31 1,000
Silicon-32 1
Phosphorus-32 10
Phosphorus-33 100
Sulfur-35 100
Chlorine-36 10
Chlorine-38 1,000
Chlorine-39 1,000
Argon-39 1,000
Argon-41 1,000
Potassium-40 100
Potassium-42 1,000
Potassium-43 1,000
Potassium-44 1,000
Potassium-45 1,000
Calcium-41 100
Calcium-45 100
Calcium-47 100
Scandium-43 1,000
Scandium-44m 100
Scandium-44 100
Scandium-46 10
Scandium-47 100
Scandium-48 100
Scandium-49 1,000
Titanium-44 1
Titanium-45 1,000
Vanadium-47 1,000
Vanadium-48 100
Vanadium-49 1,000
Chromium-48 1,000
Chromium-49 1,000
Chromium-51 1,000
Manganese-51 1,000
Manganese-52m 1,000
Manganese-52 100
Manganese-53 1,000
Manganese-54 100
Manganese-56 1,000
Iron-52 100
Iron-55 100
Iron-59 10
Iron-60 1
Cobalt-55 100
Cobalt-56 10
Cobalt-57 100
Cobalt-58m 1,000
Cobalt-58 100
Cobalt-60m 1,000
Cobalt-60 1
Cobalt-61 1,000
Cobalt-62m 1,000
Nickel-56 100
Nickel-57 100
Nickel-59 100
Nickel-63 100
Nickel-65 1,000
Nickel-66 10
Copper-60 1,000
Copper-61 1,000
Copper-64 1,000
Copper-67 1,000
Zinc-62 100
Zinc-63 1,000
Zinc-65 10
Zinc-69m 100
Zinc-69 1,000
Zinc-71m 1,000
Zinc-72 100
Gallium-65 1,000
Gallium-66 100
Gallium-67 1,000
Gallium-68 1,000
Gallium-70 1,000
Gallium-72 100
Gallium-73 1,000
Germanium-66 1,000
Germanium-67 1,000
Germanium-68 10
Germanium-69 1,000
Germanium-71 1,000
Germanium-75 1,000
Germanium-77 1,000
Germanium-78 1,000
Arsenic-69 1,000
Arsenic-70 1,000
Arsenic-71 100
Arsenic-72 100
Arsenic-73 100
Arsenic-74 100
Arsenic-76 100
Arsenic-77 100
Arsenic-78 1,000
Selenium-70 1,000
Selenium-73m 1,000
Selenium-73 100
Selenium-75 100
Selenium-79 100
Selenium-81m 1,000
Selenium-81 1,000
Selenium-83 1,000
Bromine-74m 1,000
Bromine-74 1,000
Bromine-75 1,000
Bromine-76 100
Bromine-77 1,000
Bromine-80m 1,000
Bromine-80 1,000
Bromine-82 100
Bromine-83 1,000
Bromine-84 1,000
Krypton-74 1,000
Krypton-76 1,000
Krypton-77 1,000
Krypton-79 1,000
Krypton-81 1,000
Krypton-83m 1,000
Krypton-85m 1,000
Krypton-85 1,000
Krypton-87 1,000
Krypton-88 1,000
Rubidium-79 1,000
Rubidium-81m 1,000
Rubidium-81 1,000
Rubidium-82m 1,000
Rubidium-83 100
Rubidium-84 100
Rubidium-86 100
Rubidium-87 100
Rubidium-88 1,000
Rubidium-89 1,000
Strontium-80 100
Strontium-81 1,000
Strontium-83 100
Strontium-85m 1,000
Strontium-85 100
Strontium-87m 1,000
Strontium-89 10
Strontium-90 0.1
Strontium-91 100
Strontium-92 100
Yttrium-86m 1,000
Yttrium-86 100
Yttrium-87 100
Yttrium-88 10
Yttrium-90m 1,000
Yttrium-90 10
Yttrium-91m 1,000
Yttrium-91 10
Yttrium-92 100
Yttrium-93 100
Yttrium-94 1,000
Yttrium-95 1,000
Zirconium-86 100
Zirconium-88 10
Zirconium-89 100
Zirconium-93 1
Zirconium-95 10
Zirconium-97 100
Niobium-88 1,000
Niobium-89m (66 min) 1,000
Niobium-89 (122 min) 1,000
Niobium-90 100
Niobium-93m 10
Niobium-94 1
Niobium-95m 100
Niobium-95 100
Niobium-96 100
Niobium-97 1,000
Niobium-98 1,000
Molybdenum-90 100
Molybdenum-93m 100
Molybdenum-93 10
Molybdenum-99 100
Molybdenum-101 1,000
Technetium-93m 1,000
Technetium-93 1,000
Technetium-94m 1,000
Technetium-94 1,000
Technetium-96m 1,000
Technetium-96 100
Technetium-97m 100
Technetium-97 1,000
Technetium-98 10
Technetium-99m 1,000
Technetium-99 100
Technetium-101 1,000
Technetium-104 1,000
Ruthenium-94 1,000
Ruthenium-97 1,000
Ruthenium-103 100
Ruthenium-105 1,000
Ruthenium-106 1
Rhodium-99m 1,000
Rhodium-99 100
Rhodium-100 100
Rhodium-101m 1,000
Rhodium-101 10
Rhodium-102m 10
Rhodium-102 10
Rhodium-103m 1,000
Rhodium-105 100
Rhodium-106m 1,000
Rhodium-107 1,000
Palladium-100 100
Palladium-101 1,000
Palladium-103 100
Palladium-107 10
Palladium-109 100
Silver-102 1,000
Silver-103 1,000
Silver-104m 1,000
Silver-104 1,000
Silver-105 100
Silver-106m 100
Silver-106 1,000
Silver-108m 1
Silver-110m 10
Silver-111 100
Silver-112 100
Silver-115 1,000
Cadmium-104 1,000
Cadmium-107 1,000
Cadmium-109 1
Cadmium-113m 0.1
Cadmium-113 100
Cadmium-115m 10
Cadmium-115 100
Cadmium-117m 1,000
Cadmium-117 1,000
Indium-109 1,000
Indium-110 (69.1min.) 1,000
Indium-110
(4.9h) 1,000
Indium-111 100
Indium-112 1,000
Indium-113m 1,000
Indium-114m 10
Indium-115m 1,000
Indium-115 100
Indium-116m 1,000
Indium-117m 1,000
Indium-117 1,000
Indium-119m 1,000
Tin-110 100
Tin-111 1,000
Tin-113 100
Tin-117m 100
Tin-119m 100
Tin-121m 100
Tin-121 1,000
Tin-123m 1,000
Tin-123 10
Tin-125 10
Tin-126 10
Tin-127 1,000
Tin-128 1,000
Antimony-115 1,000
Antimony-116m 1,000
Antimony-116 1,000
Antimony-117 1,000
Antimony-118m 1,000
Antimony-119 1,000
Antimony-120 (16min.) 1,000
Antimony-120 (5.76d) 100
Antimony-122 100
Antimony-124m 1,000
Antimony-124 10
Antimony-125 100
Antimony-126m 1,000
Antimony-126 100
Antimony-127 100
Antimony-128 (10.4min.) 1,000
Antimony-128 (9.01h) 100
Antimony-129 100
Antimony-130 1,000
Antimony-131 1,000
Tellurium-116 1,000
Tellurium-121m 10
Tellurium-121 100
Tellurium-123m 10
Tellurium-123 100
Tellurium-125m 10
Tellurium-127m 10
Tellurium-127 1,000
Tellurium-129m 10
Tellurium-129 1,000
Tellurium-131m 10
Tellurium-131 100
Tellurium-132 10
Tellurium-133m 100
Tellurium-133 1,000
Tellurium-134 1,000
Iodine-120m 1,000
Iodine-120 100
Iodine-121 1,000
Iodine-123 100
Iodine-124 10
Iodine-125 1
Iodine-126 1
Iodine-128 1,000
Iodine-129 1
Iodine-130 10
Iodine-131 1
Iodine-132m 100
Iodine-132 100
Iodine-133 10
Iodine-134 1,000
Iodine-135 100
Xenon-120 1,000
Xenon-121 1,000
Xenon-122 1,000
Xenon-123 1,000
Xenon-125 1,000
Xenon-127 1,000
Xenon-129m 1,000
Xenon-131m 1,000
Xenon-133m 1,000
Xenon-133 1,000
Xenon-135m 1,000
Xenon-135 1,000
Xenon-138 1,000
Cesium-125 1,000
Cesium-127 1,000
Cesium-129 1,000
Cesium-130 1,000
Cesium-131 1,000
Cesium-132 100
Cesium-134m 1,000
Cesium-134 10
Cesium-135m 1,000
Cesium-135 100
Cesium-136 10
Cesium-137 10
Cesium-138 1,000
Barium-126 1,000
Barium-128 100
Barium-131m 1,000
Barium-131 100
Barium-133m 100
Barium-133 100
Barium-135m 100
Barium-139 1,000
Barium-140 100
Barium-141 1,000
Barium-142 1,000
Lanthanum-131 1,000
Lanthanum-132 100
Lanthanum-135 1,000
Lanthanum-137 10
Lanthanum-138 100
Lanthanum-140 100
Lanthanum-141 100
Lanthanum-142 1,000
Lanthanum-143 1,000
Cerium-134 100
Cerium-135 100
Cerium-137m 100
Cerium-137 1,000
Cerium-139 100
Cerium-141 100
Cerium-143 100
Cerium-144 1
Praseodymium-136 1,000
Praseodymium-137 1,000
Praseodymium-138m 1,000
Praseodymium-139 1,000
Praseodymium-142m 1,000
Praseodymium-142 100
Praseodymium-143 100
Praseodymium-144 1,000
Praseodymium-145 100
Praseodymium-147 1,000
Neodymium-136 1,000
Neodymium-138 100
Neodymium-139m 1,000
Neodymium-139 1,000
Neodymium-141 1,000
Neodymium-147 100
Neodymium-149 1,000
Neodymium-151 1,000
Promethium-141 1,000
Promethium-143 100
Promethium-144 10
Promethium-145 10
Promethium-146 1
Promethium-147 10
Promethium-148m 10
Promethium-148 10
Promethium-149 100
Promethium-150 1,000
Promethium-151 100
Samarium-141m 1,000
Samarium-141 1,000
Samarium-142 1,000
Samarium-145 100
Samarium-146 1
Samarium-147 100
Samarium-151 10
Samarium-153 100
Samarium-155 1,000
Samarium-156 1,000
Europium-145 100
Europium-146 100
Europium-147 100
Europium-148 10
Europium-149 100
Europium-150 (12.62h) 100
Europium-150 (34.2y) 1
Europium-152m 100
Europium-152 1
Europium-154 1
Europium-155 10
Europium-156 100
Europium-157 100
Europium-158 1,000
Gadolinium-145 1,000
Gadolinium-146 10
Gadolinium-147 100
Gadolinium-148 0.001
Gadolinium-149 100
Gadolinium-151 10
Gadolinium-152 100
Gadolinium-153 10
Gadolinium-159 100
Terbium-147 1,000
Terbium-149 100
Terbium-150 1,000
Terbium-151 100
Terbium-153 1,000
Terbium-154 100
Terbium-155 1,000
Terbium-156m (5.0h) 1,000
Terbium-156m (24.4h) 1,000
Terbium-156 100
Terbium-157 10
Terbium-158 1
Terbium-160 10
Terbium-161 100
Dysprosium-155 1,000
Dysprosium-157 1,000
Dysprosium-159 100
Dysprosium-165 1,000
Dysprosium-166 100
Holmium-155 1,000
Holmium-157 1,000
Holmium-159 1,000
Holmium-161 1,000
Holmium-162m 1,000
Holmium-162 1,000
Holmium-164m 1,000
Holmium-164 1,000
Holmium-166m 1
Holmium-166 100
Holmium-167 1,000
Erbium-161 1,000
Erbium-165 1,000
Erbium-169 100
Erbium-171 100
Erbium-172 100
Thulium-162 1,000
Thulium-166 100
Thulium-167 100
Thulium-170 10
Thulium-171 10
Thulium-172 100
Thulium-173 100
Thulium-175 1,000
Ytterbium-162 1,000
Ytterbium-166 100
Ytterbium-167 1,000
Ytterbium-169 100
Ytterbium-175 100
Ytterbium-177 1,000
Ytterbium-178 1,000
Lutetium-169 100
Lutetium-170 100
Lutetium-171 100
Lutetium-172 100
Lutetium-173 10
Lutetium-174m 10
Lutetium-174 10
Lutetium-176m 1,000
Lutetium-176 100
Lutetium-177m 10
Lutetium-177 100
Lutetium-178m 1,000
Lutetium-178 1,000
Lutetium-179 1,000
Hafnium-170 100
Hafnium-172 1
Hafnium-173 1,000
Hafnium-175 100
Hafnium-177m 1,000
Hafnium-178m 0.1
Hafnium-179m 10
Hafnium-180m 1,000
Hafnium-181 10
Hafnium-182m 1,000
Hafnium-182 0.1
Hafnium-183 1,000
Hafnium-184 100
Tantalum-172 1,000
Tantalum-173 1,000
Tantalum-174 1,000
Tantalum-175 1,000
Tantalum-176 100
Tantalum-177 1,000
Tantalum-178 1,000
Tantalum-179 100
Tantalum-180m 1,000
Tantalum-180 100
Tantalum-182m 1,000
Tantalum-182 10
Tantalum-183 100
Tantalum-184 100
Tantalum-185 1,000
Tantalum-186 1,000
Tungsten-176 1,000
Tungsten-177 1,000
Tungsten-178 1,000
Tungsten-179 1,000
Tungsten-181 1,000
Tungsten-185 100
Tungsten-187 100
Tungsten-188 10
Rhenium-177 1,000
Rhenium-178 1,000
Rhenium-181 1,000
Rhenium-182 (12.7h) 1,000
Rhenium-182 (64.0h) 100
Rhenium-184m 10
Rhenium-184 100
Rhenium-186m 10
Rhenium-186 100
Rhenium-187 1,000
Rhenium-188m 1,000
Rhenium-188 100
Rhenium-189 100
Osmium-180 1,000
Osmium-181 1,000
Osmium-182 100
Osmium-185 100
Osmium-189m 1,000
Osmium-191m 1,000
Osmium-191 100
Osmium-193 100
Osmium-194 1
Iridium-182 1,000
Iridium-184 1,000
Iridium-185 1,000
Iridium-186 100
Iridium-187 1,000
Iridium-188 100
Iridium-189 100
Iridium-190m 1,000
Iridium-190 100
Iridium-192 (73.8d) 1
Iridium-192m (1.4min.) 10
Iridium-194m 10
Iridium-194 100
Iridium-195m 1,000
Iridium-195 1,000
Platinum-186 1,000
Platinum-188 100
Platinum-189 1,000
Platinum-191 100
Platinum-193m 100
Platinum-193 1,000
Platinum-195m 100
Platinum-197m 1,000
Platinum-197 100
Platinum-199 1,000
Platinum-200 100
Gold-193 1,000
Gold-194 100
Gold-195 10
Gold-198m 100
Gold-198 100
Gold-199 100
Gold-200m 100
Gold-200 1,000
Gold-201 1,000
Mercury-193m 100
Mercury-193 1,000
Mercury-194 1
Mercury-195m 100
Mercury-195 1,000
Mercury-197m 100
Mercury-197 1,000
Mercury-199m 1,000
Mercury-203 100
Thallium-194m 1,000
Thallium-194 1,000
Thallium-195 1,000
Thallium-197 1,000
Thallium-198m 1,000
Thallium-198 1,000
Thallium-199 1,000
Thallium-200 1,000
Thallium-201 1,000
Thallium-202 100
Thallium-204 100
Lead-195m 1,000
Lead-198 1,000
Lead-199 1,000
Lead-200 100
Lead-201 1,000
Lead-202m 1,000
Lead-202 10
Lead-203 1,000
Lead-205 100
Lead-209 1,000
Lead-210 0.01
Lead-211 100
Lead-212 1
Lead-214 100
Bismuth-200 1,000
Bismuth-201 1,000
Bismuth-202 1,000
Bismuth-203 100
Bismuth-205 100
Bismuth-206 100
Bismuth-207 10
Bismuth-210m 0.1
Bismuth-210 1
Bismuth-212 10
Bismuth-213 10
Bismuth-214 100
Polonium-203 1,000
Polonium-205 1,000
Polonium-207 1,000
Polonium-210 0.1
Astatine-207 100
Astatine-211 10
Radon-220 1
Radon-222 1
Francium-222 100
Francium-223 100
Radium-223 0.1
Radium-224 0.1
Radium-225 0.1
Radium-226 0.1
Radium-227 1,000
Radium-228 0.1
Actinium-224 1
Actinium-225 0.01
Actinium-226 0.1
Actinium-227 0.001
Actinium-228 1
Thorium-226 10
Thorium-227 0.01
Thorium-228 0.001
Thorium-229 0.001
Thorium-230 0.001
Thorium-231 100
Thorium-232 100
Thorium-234 10
Thorium-natural 100
Protactinium-227 10
Protactinium-228 1
Protactinium-230 0.1
Protactinium-231 0.001
Protactinium-232 1
Protactinium-233 100
Protactinium-234 100
Uranium-230 0.01
Uranium-231 100
Uranium-232 0.001
Uranium-233 0.001
Uranium-234 0.001
Uranium-235 0.001
Uranium-236 0.001
Uranium-237 100
Uranium-238 100
Uranium-239 1,000
Uranium-240 100
Uranium-natural 100
Neptunium-232 100
Neptunium-233 1,000
Neptunium-234 100
Neptunium-235 100
Neptunium-236 (1.15 × 105 y) 0.001
Neptunium-236 (22.5h) 1
Neptunium-237 0.001
Neptunium-238 10
Neptunium-239 100
Neptunium-240 1,000
Plutonium-234 10
Plutonium-235 1,000
Plutonium-236 0.001
Plutonium-237 100
Plutonium-238 0.001
Plutonium-239 0.001
Plutonium-240 0.001
Plutonium-241 0.01
Plutonium-242 0.001
Plutonium-243 1,000
Plutonium-244 0.001
Plutonium-245 100
Americium-237 1,000
Americium-238 100
Americium-239 1,000
Americium-240 100
Americium-241 0.001
Americium-242m 0.001
Americium-242 10
Americium-243 0.001
Americium-244m 100
Americium-244 10
Americium-245 1,000
Americium-246m 1,000
Americium-246 1,000
Curium-238 100
Curium-240 0.1
Curium-241 1
Curium-242 0.01
Curium-243 0.001
Curium-244 0.001
Curium-245 0.001
Curium-246 0.001
Curium-247 0.001
Curium-248 0.001
Curium-249 1,000
Berkelium-245 100
Berkelium-246 100
Berkelium-247 0.001
Berkelium-249 0.1
Berkelium-250 10
Californium-244 100
Californium-246 1
Californium-248 0.01
Californium-249 0.001
Californium-250 0.001
Californium-251 0.001
Californium-252 0.001
Californium-253 0.1
Californium-254 0.001
Any alpha emitting radionuclide not listed above or mixtures of alpha emitters of unknown composition 0.001
Einsteinium-250 100
Einsteinium-251 100
Einsteinium-253 0.1
Einsteinium-254m 1
Einsteinium-254 0.01
Fermium-252 1
Fermium-253 1
Fermium-254 10
Fermium-255 1
Fermium-257 0.01
Mendelevium-257 10
Mendelevium-258 0.01
Any radionuclide other than alpha emitting radionuclides not listed above, or mixtures of beta emitters of unknown composition 0.01
1 The quantities listed above were derived by taking 1⁄10th of the most restrictive ALI listed in table 1, columns 1 and 2, of appendix B to §§ 20.1001-20.2401 of this part, rounding to the nearest factor of 10, and arbitrarily constraining the values listed between 0.001 and 1,000 µCi. Values of 100 µCi have been assigned for radionuclides having a radioactive half-life in excess of 109 years (except rhenium, 1000 µCi) to take into account their low specific activity.
Note: For purposes of §§ 20.1902(e), 20.1905(a), and 20.2201(a) where there is involved a combination of radionuclides in known amounts, the limit for the combination should be derived as follows: determine, for each radionuclide in the combination, the ratio between the quantity present in the combination and the limit otherwise established for the specific radionuclide when not in combination. The sum of such ratios for all radionuclides in the combination may not exceed “1” (i.e., “unity”).

Where this section sits in the code

Title 10—Energy
CHAPTER I—NUCLEAR REGULATORY COMMISSION
PART 20—STANDARDS FOR PROTECTION AGAINST RADIATION

Radionuclide Quantity (µCi)

Hydrogen-3 1,000

Beryllium-7 1,000

Beryllium-10 1

Carbon-11 1,000

Carbon-14 100

Fluorine-18 1,000

Sodium-22 10

Sodium-24 100

Magnesium-28 100

Aluminum-26 10

Silicon-31 1,000

Silicon-32 1

Phosphorus-32 10

Phosphorus-33 100

Sulfur-35 100

Chlorine-36 10

Chlorine-38 1,000

Chlorine-39 1,000

Argon-39 1,000

Argon-41 1,000

Potassium-40 100

Potassium-42 1,000

Potassium-43 1,000

Potassium-44 1,000

Potassium-45 1,000

Calcium-41 100

Calcium-45 100

Calcium-47 100

Scandium-43 1,000

Scandium-44m 100

Scandium-44 100

Scandium-46 10

Scandium-47 100

Scandium-48 100

Scandium-49 1,000

Titanium-44 1

Titanium-45 1,000

Vanadium-47 1,000

Vanadium-48 100

Vanadium-49 1,000

Chromium-48 1,000

Chromium-49 1,000

Chromium-51 1,000

Manganese-51 1,000

Manganese-52m 1,000

Manganese-52 100

Manganese-53 1,000

Manganese-54 100

Manganese-56 1,000

Iron-52 100

Iron-55 100

Iron-59 10

Iron-60 1

Cobalt-55 100

Cobalt-56 10

Cobalt-57 100

Cobalt-58m 1,000

Cobalt-58 100

Cobalt-60m 1,000

Cobalt-60 1

Cobalt-61 1,000

Cobalt-62m 1,000

Nickel-56 100

Nickel-57 100

Nickel-59 100

Nickel-63 100

Nickel-65 1,000

Nickel-66 10

Copper-60 1,000

Copper-61 1,000

Copper-64 1,000

Copper-67 1,000

Zinc-62 100

Zinc-63 1,000

Zinc-65 10

Zinc-69m 100

Zinc-69 1,000

Zinc-71m 1,000

Zinc-72 100

Gallium-65 1,000

Gallium-66 100

Gallium-67 1,000

Gallium-68 1,000

Gallium-70 1,000

Gallium-72 100

Gallium-73 1,000

Germanium-66 1,000

Germanium-67 1,000

Germanium-68 10

Germanium-69 1,000

Germanium-71 1,000

Germanium-75 1,000

Germanium-77 1,000

Germanium-78 1,000

Arsenic-69 1,000

Arsenic-70 1,000

Arsenic-71 100

Arsenic-72 100

Arsenic-73 100

Arsenic-74 100

Arsenic-76 100

Arsenic-77 100

Arsenic-78 1,000

Selenium-70 1,000

Selenium-73m 1,000

Selenium-73 100

Selenium-75 100

Selenium-79 100

Selenium-81m 1,000

Selenium-81 1,000

Selenium-83 1,000

Bromine-74m 1,000

Bromine-74 1,000

Bromine-75 1,000

Bromine-76 100

Bromine-77 1,000

Bromine-80m 1,000

Bromine-80 1,000

Bromine-82 100

Bromine-83 1,000

Bromine-84 1,000

Krypton-74 1,000

Krypton-76 1,000

Krypton-77 1,000

Krypton-79 1,000

Krypton-81 1,000

Krypton-83m 1,000

Krypton-85m 1,000

Krypton-85 1,000

Krypton-87 1,000

Krypton-88 1,000

Rubidium-79 1,000

Rubidium-81m 1,000

Rubidium-81 1,000

Rubidium-82m 1,000

Rubidium-83 100

Rubidium-84 100

Rubidium-86 100

Rubidium-87 100

Rubidium-88 1,000

Rubidium-89 1,000

Strontium-80 100

Strontium-81 1,000

Strontium-83 100

Strontium-85m 1,000

Strontium-85 100

Strontium-87m 1,000

Strontium-89 10

Strontium-90 0.1

Strontium-91 100

Strontium-92 100

Yttrium-86m 1,000

Yttrium-86 100

Yttrium-87 100

Yttrium-88 10

Yttrium-90m 1,000

Yttrium-90 10

Yttrium-91m 1,000

Yttrium-91 10

Yttrium-92 100

Yttrium-93 100

Yttrium-94 1,000

Yttrium-95 1,000

Zirconium-86 100

Zirconium-88 10

Zirconium-89 100

Zirconium-93 1

Zirconium-95 10

Zirconium-97 100

Niobium-88 1,000

Niobium-89m (66 min) 1,000

Niobium-89 (122 min) 1,000

Niobium-90 100

Niobium-93m 10

Niobium-94 1

Niobium-95m 100

Niobium-95 100

Niobium-96 100

Niobium-97 1,000

Niobium-98 1,000

Molybdenum-90 100

Molybdenum-93m 100

Molybdenum-93 10

Molybdenum-99 100

Molybdenum-101 1,000

Technetium-93m 1,000

Technetium-93 1,000

Technetium-94m 1,000

Technetium-94 1,000

Technetium-96m 1,000

Technetium-96 100

Technetium-97m 100

Technetium-97 1,000

Technetium-98 10

Technetium-99m 1,000

Technetium-99 100

Technetium-101 1,000

Technetium-104 1,000

Ruthenium-94 1,000

Ruthenium-97 1,000

Ruthenium-103 100

Ruthenium-105 1,000

Ruthenium-106 1

Rhodium-99m 1,000

Rhodium-99 100

Rhodium-100 100

Rhodium-101m 1,000

Rhodium-101 10

Rhodium-102m 10

Rhodium-102 10

Rhodium-103m 1,000

Rhodium-105 100

Rhodium-106m 1,000

Rhodium-107 1,000

Palladium-100 100

Palladium-101 1,000

Palladium-103 100

Palladium-107 10

Palladium-109 100

Silver-102 1,000

Silver-103 1,000

Silver-104m 1,000

Silver-104 1,000

Silver-105 100

Silver-106m 100

Silver-106 1,000

Silver-108m 1

Silver-110m 10

Silver-111 100

Silver-112 100

Silver-115 1,000

Cadmium-104 1,000

Cadmium-107 1,000

Cadmium-109 1

Cadmium-113m 0.1

Cadmium-113 100

Cadmium-115m 10

Cadmium-115 100

Cadmium-117m 1,000

Cadmium-117 1,000

Indium-109 1,000

Indium-110 (69.1min.) 1,000

Indium-110

(4.9h) 1,000

Indium-111 100

Indium-112 1,000

Indium-113m 1,000

Indium-114m 10

Indium-115m 1,000

Indium-115 100

Indium-116m 1,000

Indium-117m 1,000

Indium-117 1,000

Indium-119m 1,000

Tin-110 100

Tin-111 1,000

Tin-113 100

Tin-117m 100

Tin-119m 100

Tin-121m 100

Tin-121 1,000

Tin-123m 1,000

Tin-123 10

Tin-125 10

Tin-126 10

Tin-127 1,000

Tin-128 1,000

Antimony-115 1,000

Antimony-116m 1,000

Antimony-116 1,000

Antimony-117 1,000

Antimony-118m 1,000

Antimony-119 1,000

Antimony-120 (16min.) 1,000

Antimony-120 (5.76d) 100

Antimony-122 100

Antimony-124m 1,000

Antimony-124 10

Antimony-125 100

Antimony-126m 1,000

Antimony-126 100

Antimony-127 100

Antimony-128 (10.4min.) 1,000

Antimony-128 (9.01h) 100

Antimony-129 100

Antimony-130 1,000

Antimony-131 1,000

Tellurium-116 1,000

Tellurium-121m 10

Tellurium-121 100

Tellurium-123m 10

Tellurium-123 100

Tellurium-125m 10

Tellurium-127m 10

Tellurium-127 1,000

Tellurium-129m 10

Tellurium-129 1,000

Tellurium-131m 10

Tellurium-131 100

Tellurium-132 10

Tellurium-133m 100

Tellurium-133 1,000

Tellurium-134 1,000

Iodine-120m 1,000

Iodine-120 100

Iodine-121 1,000

Iodine-123 100

Iodine-124 10

Iodine-125 1

Iodine-126 1

Iodine-128 1,000

Iodine-129 1

Iodine-130 10

Iodine-131 1

Iodine-132m 100

Iodine-132 100

Iodine-133 10

Iodine-134 1,000

Iodine-135 100

Xenon-120 1,000

Xenon-121 1,000

Xenon-122 1,000

Xenon-123 1,000

Xenon-125 1,000

Xenon-127 1,000

Xenon-129m 1,000

Xenon-131m 1,000

Xenon-133m 1,000

Xenon-133 1,000

Xenon-135m 1,000

Xenon-135 1,000

Xenon-138 1,000

Cesium-125 1,000

Cesium-127 1,000

Cesium-129 1,000

Cesium-130 1,000

Cesium-131 1,000

Cesium-132 100

Cesium-134m 1,000

Cesium-134 10

Cesium-135m 1,000

Cesium-135 100

Cesium-136 10

Cesium-137 10

Cesium-138 1,000

Barium-126 1,000

Barium-128 100

Barium-131m 1,000

Barium-131 100

Barium-133m 100

Barium-133 100

Barium-135m 100

Barium-139 1,000

Barium-140 100

Barium-141 1,000

Barium-142 1,000

Lanthanum-131 1,000

Lanthanum-132 100

Lanthanum-135 1,000

Lanthanum-137 10

Lanthanum-138 100

Lanthanum-140 100

Lanthanum-141 100

Lanthanum-142 1,000

Lanthanum-143 1,000

Cerium-134 100

Cerium-135 100

Cerium-137m 100

Cerium-137 1,000

Cerium-139 100

Cerium-141 100

Cerium-143 100

Cerium-144 1

Praseodymium-136 1,000

Praseodymium-137 1,000

Praseodymium-138m 1,000

Praseodymium-139 1,000

Praseodymium-142m 1,000

Praseodymium-142 100

Praseodymium-143 100

Praseodymium-144 1,000

Praseodymium-145 100

Praseodymium-147 1,000

Neodymium-136 1,000

Neodymium-138 100

Neodymium-139m 1,000

Neodymium-139 1,000

Neodymium-141 1,000

Neodymium-147 100

Neodymium-149 1,000

Neodymium-151 1,000

Promethium-141 1,000

Promethium-143 100

Promethium-144 10

Promethium-145 10

Promethium-146 1

Promethium-147 10

Promethium-148m 10

Promethium-148 10

Promethium-149 100

Promethium-150 1,000

Promethium-151 100

Samarium-141m 1,000

Samarium-141 1,000

Samarium-142 1,000

Samarium-145 100

Samarium-146 1

Samarium-147 100

Samarium-151 10

Samarium-153 100

Samarium-155 1,000

Samarium-156 1,000

Europium-145 100

Europium-146 100

Europium-147 100

Europium-148 10

Europium-149 100

Europium-150 (12.62h) 100

Europium-150 (34.2y) 1

Europium-152m 100

Europium-152 1

Europium-154 1

Europium-155 10

Europium-156 100

Europium-157 100

Europium-158 1,000

Gadolinium-145 1,000

Gadolinium-146 10

Gadolinium-147 100

Gadolinium-148 0.001

Gadolinium-149 100

Gadolinium-151 10

Gadolinium-152 100

Gadolinium-153 10

Gadolinium-159 100

Terbium-147 1,000

Terbium-149 100

Terbium-150 1,000

Terbium-151 100

Terbium-153 1,000

Terbium-154 100

Terbium-155 1,000

Terbium-156m (5.0h) 1,000

Terbium-156m (24.4h) 1,000

Terbium-156 100

Terbium-157 10

Terbium-158 1

Terbium-160 10

Terbium-161 100

Dysprosium-155 1,000

Dysprosium-157 1,000

Dysprosium-159 100

Dysprosium-165 1,000

Dysprosium-166 100

Holmium-155 1,000

Holmium-157 1,000

Holmium-159 1,000

Holmium-161 1,000

Holmium-162m 1,000

Holmium-162 1,000

Holmium-164m 1,000

Holmium-164 1,000

Holmium-166m 1

Holmium-166 100

Holmium-167 1,000

Erbium-161 1,000

Erbium-165 1,000

Erbium-169 100

Erbium-171 100

Erbium-172 100

Thulium-162 1,000

Thulium-166 100

Thulium-167 100

Thulium-170 10

Thulium-171 10

Thulium-172 100

Thulium-173 100

Thulium-175 1,000

Ytterbium-162 1,000

Ytterbium-166 100

Ytterbium-167 1,000

Ytterbium-169 100

Ytterbium-175 100

Ytterbium-177 1,000

Ytterbium-178 1,000

Lutetium-169 100

Lutetium-170 100

Lutetium-171 100

Lutetium-172 100

Lutetium-173 10

Lutetium-174m 10

Lutetium-174 10

Lutetium-176m 1,000

Lutetium-176 100

Lutetium-177m 10

Lutetium-177 100

Lutetium-178m 1,000

Lutetium-178 1,000

Lutetium-179 1,000

Hafnium-170 100

Hafnium-172 1

Hafnium-173 1,000

Hafnium-175 100

Hafnium-177m 1,000

Hafnium-178m 0.1

Hafnium-179m 10

Hafnium-180m 1,000

Hafnium-181 10

Hafnium-182m 1,000

Hafnium-182 0.1

Hafnium-183 1,000

Hafnium-184 100

Tantalum-172 1,000

Tantalum-173 1,000

Tantalum-174 1,000

Tantalum-175 1,000

Tantalum-176 100

Tantalum-177 1,000

Tantalum-178 1,000

Tantalum-179 100

Tantalum-180m 1,000

Tantalum-180 100

Tantalum-182m 1,000

Tantalum-182 10

Tantalum-183 100

Tantalum-184 100

Tantalum-185 1,000

Tantalum-186 1,000

Tungsten-176 1,000

Tungsten-177 1,000

Tungsten-178 1,000

Tungsten-179 1,000

Tungsten-181 1,000

Tungsten-185 100

Tungsten-187 100

Tungsten-188 10

Rhenium-177 1,000

Rhenium-178 1,000

Rhenium-181 1,000

Rhenium-182 (12.7h) 1,000

Rhenium-182 (64.0h) 100

Rhenium-184m 10

Rhenium-184 100

Rhenium-186m 10

Rhenium-186 100

Rhenium-187 1,000

Rhenium-188m 1,000

Rhenium-188 100

Rhenium-189 100

Osmium-180 1,000

Osmium-181 1,000

Osmium-182 100

Osmium-185 100

Osmium-189m 1,000

Osmium-191m 1,000

Osmium-191 100

Osmium-193 100

Osmium-194 1

Iridium-182 1,000

Iridium-184 1,000

Iridium-185 1,000

Iridium-186 100

Iridium-187 1,000

Iridium-188 100

Iridium-189 100

Iridium-190m 1,000

Iridium-190 100

Iridium-192 (73.8d) 1

Iridium-192m (1.4min.) 10

Iridium-194m 10

Iridium-194 100

Iridium-195m 1,000

Iridium-195 1,000

Platinum-186 1,000

Platinum-188 100

Platinum-189 1,000

Platinum-191 100

Platinum-193m 100

Platinum-193 1,000

Platinum-195m 100

Platinum-197m 1,000

Platinum-197 100

Platinum-199 1,000

Platinum-200 100

Gold-193 1,000

Gold-194 100

Gold-195 10

Gold-198m 100

Gold-198 100

Gold-199 100

Gold-200m 100

Gold-200 1,000

Gold-201 1,000

Mercury-193m 100

Mercury-193 1,000

Mercury-194 1

Mercury-195m 100

Mercury-195 1,000

Mercury-197m 100

Mercury-197 1,000

Mercury-199m 1,000

Mercury-203 100

Thallium-194m 1,000

Thallium-194 1,000

Thallium-195 1,000

Thallium-197 1,000

Thallium-198m 1,000

Thallium-198 1,000

Thallium-199 1,000

Thallium-200 1,000

Thallium-201 1,000

Thallium-202 100

Thallium-204 100

Lead-195m 1,000

Lead-198 1,000

Lead-199 1,000

Lead-200 100

Lead-201 1,000

Lead-202m 1,000

Lead-202 10

Lead-203 1,000

Lead-205 100

Lead-209 1,000

Lead-210 0.01

Lead-211 100

Lead-212 1

Lead-214 100

Bismuth-200 1,000

Bismuth-201 1,000

Bismuth-202 1,000

Bismuth-203 100

Bismuth-205 100

Bismuth-206 100

Bismuth-207 10

Bismuth-210m 0.1

Bismuth-210 1

Bismuth-212 10

Bismuth-213 10

Bismuth-214 100

Polonium-203 1,000

Polonium-205 1,000

Polonium-207 1,000

Polonium-210 0.1

Astatine-207 100

Astatine-211 10

Radon-220 1

Radon-222 1

Francium-222 100

Francium-223 100

Radium-223 0.1

Radium-224 0.1

Radium-225 0.1

Radium-226 0.1

Radium-227 1,000

Radium-228 0.1

Actinium-224 1

Actinium-225 0.01

Actinium-226 0.1

Actinium-227 0.001

Actinium-228 1

Thorium-226 10

Thorium-227 0.01

Thorium-228 0.001

Thorium-229 0.001

Thorium-230 0.001

Thorium-231 100

Thorium-232 100

Thorium-234 10

Thorium-natural 100

Protactinium-227 10

Protactinium-228 1

Protactinium-230 0.1

Protactinium-231 0.001

Protactinium-232 1

Protactinium-233 100

Protactinium-234 100

Uranium-230 0.01

Uranium-231 100

Uranium-232 0.001

Uranium-233 0.001

Uranium-234 0.001

Uranium-235 0.001

Uranium-236 0.001

Uranium-237 100

Uranium-238 100

Uranium-239 1,000

Uranium-240 100

Uranium-natural 100

Neptunium-232 100

Neptunium-233 1,000

Neptunium-234 100

Neptunium-235 100

Neptunium-236 (1.15 × 105 y) 0.001

Neptunium-236 (22.5h) 1

Neptunium-237 0.001

Neptunium-238 10

Neptunium-239 100

Neptunium-240 1,000

Plutonium-234 10

Plutonium-235 1,000

Plutonium-236 0.001

Plutonium-237 100

Plutonium-238 0.001

Plutonium-239 0.001

Plutonium-240 0.001

Plutonium-241 0.01

Plutonium-242 0.001

Plutonium-243 1,000

Plutonium-244 0.001

Plutonium-245 100

Americium-237 1,000

Americium-238 100

Americium-239 1,000

Americium-240 100

Americium-241 0.001

Americium-242m 0.001

Americium-242 10

Americium-243 0.001

Americium-244m 100

Americium-244 10

Americium-245 1,000

Americium-246m 1,000

Americium-246 1,000

Curium-238 100

Curium-240 0.1

Curium-241 1

Curium-242 0.01

Curium-243 0.001

Curium-244 0.001

Curium-245 0.001

Curium-246 0.001

Curium-247 0.001

Curium-248 0.001

Curium-249 1,000

Berkelium-245 100

Berkelium-246 100

Berkelium-247 0.001

Berkelium-249 0.1

Berkelium-250 10

Californium-244 100

Californium-246 1

Californium-248 0.01

Californium-249 0.001

Californium-250 0.001

Californium-251 0.001

Californium-252 0.001

Californium-253 0.1

Californium-254 0.001

Any alpha emitting radionuclide not listed above or mixtures of alpha emitters of unknown composition 0.001

Einsteinium-250 100

Einsteinium-251 100

Einsteinium-253 0.1

Einsteinium-254m 1

Einsteinium-254 0.01

Fermium-252 1

Fermium-253 1

Fermium-254 10

Fermium-255 1

Fermium-257 0.01

Mendelevium-257 10

Mendelevium-258 0.01

Any radionuclide other than alpha emitting radionuclides not listed above, or mixtures of beta emitters of unknown composition 0.01

1 The quantities listed above were derived by taking 1⁄10th of the most restrictive ALI listed in table 1, columns 1 and 2, of appendix B to §§ 20.1001-20.2401 of this part, rounding to the nearest factor of 10, and arbitrarily constraining the values listed between 0.001 and 1,000 µCi. Values of 100 µCi have been assigned for radionuclides having a radioactive half-life in excess of 109 years (except rhenium, 1000 µCi) to take into account their low specific activity.

Note: For purposes of §§ 20.1902(e), 20.1905(a), and 20.2201(a) where there is involved a combination of radionuclides in known amounts, the limit for the combination should be derived as follows: determine, for each radionuclide in the combination, the ratio between the quantity present in the combination and the limit otherwise established for the specific radionuclide when not in combination. The sum of such ratios for all radionuclides in the combination may not exceed “1” (i.e., “unity”).

Collected 2026-08-27T02:24:09Z. Source file · JSON

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