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The U.S. Nuclear Regulatory Commission is in the process of rescinding or revising guidance and policies posted on this webpage in accordance with Executive Order 14151 Ending Radical and Wasteful Government DEI Programs and Preferencing, and Executive Order 14168 Defending Women From Gender Ideology Extremism and Restoring Biological Truth to the Federal Government. In the interim, any previously issued diversity, equity, inclusion, or gender-related guidance on this webpage should be considered rescinded that is inconsistent with these Executive Orders.

Home NRC Library Document Collections Regulations (NRC, 10 CFR) Part Index

Radionuclides

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Barium-126 Barium-128 Barium-131 Barium-131m Barium-133 Barium-133m Barium-135m Barium-139 Barium-140 Barium-141 Barium-142 Berkelium-245 Berkelium-246 Berkelium-247	Berkelium-249 Berkelium-250 Beryllium-7 Beryllium-10 Bismuth-200 Bismuth-201 Bismuth-202 Bismuth-203 Bismuth-205 Bismuth-206 Bismuth-207 Bismuth-210 Bismuth-210m Bismuth-212	Bismuth-213 Bismuth-214 Bromine-74 Bromine-74m Bromine-75 Bromine-76 Bromine-77 Bromine-80 Bromine-80m Bromine-82 Bromine-83 Bromine-84

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Cadmium-104 Cadmium-107 Cadmium-109 Cadmium-113 Cadmium-113m Cadmium-115 Cadmium-115m Cadmium-117 Cadmium-117m Calcium-41 Calcium-45 Calcium-47 Californium-244 Californium-246 Californium-248 Californium-249 Californium-250 Californium-251 Californium-252 Californium-253 Californium-254 Carbon-11 Carbon-14 Cerium-134 Cerium-135	Cerium-137 Cerium-137m Cerium-139 Cerium-141 Cerium-143 Cerium-144 Cesium-125 Cesium-127 Cesium-129 Cesium-130 Cesium-131 Cesium-132 Cesium-134 Cesium-134m Cesium-135 Cesium-135m Cesium-136 Cesium-137 Cesium-138 Chlorine-36 Chlorine-38 Chlorine-39 Chromium-48 Chromium-49 Chromium-51	Cobalt-55 Cobalt-56 Cobalt-57 Cobalt-58 Cobalt-58m Cobalt-60 Cobalt-60m Cobalt-61 Cobalt-62m Copper-60 Copper-61 Copper-64 Copper-67 Curium-238 Curium-240 Curium-241 Curium-242 Curium-243 Curium-244 Curium-245 Curium-246 Curium-247 Curium-248 Curium-249 Curium-250

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Dysprosium-155 Dysprosium-157	Dysprosium-159 Dysprosium-165	Dysprosium-166

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Einsteinium-250 Einsteinium-251 Einsteinium-253 Einsteinium-254 Einsteinium-254m Erbium-161 Erbium-165 Erbium-169	Erbium-171 Erbium-172 Europium-145 Europium-146 Europium-147 Europium-148 Europium-149 Europium-150 (12.62 h)	Europium-150 (34.2 y) Europium-152 Europium-152m Europium-154 Europium-155 Europium-156 Europium-157 Europium-158

[ A \| B \| C \| D \| E \| F \| G \| H \| I \| J \| K \| L \| M \| N \| O \| P \| Q \| R \| S \| T \| U \| V \| W \| X \| Y \| Z \| Unlisted ]
Fermium-252 Fermium-253 Fermium-254	Fermium-255 Fermium-257 Fluorine-18	Francium-223 Francium-222

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Gadolinium-145 Gadolinium-146 Gadolinium-147 Gadolinium-148 Gadolinium-149 Gadolinium-151 Gadolinium-152 Gadolinium-153 Gadolinium-159 Gallium-65 Gallium-66	Gallium-67 Gallium-68 Gallium-70 Gallium-72 Gallium-73 Germanium-66 Germanium-67 Germanium-68 Germanium-69 Germanium-71 Germanium-75	Germanium-77 Germanium-78 Gold-193 Gold-194 Gold-195 Gold-198 Gold-198m Gold-199 Gold-200 Gold-200m Gold-201

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Hafnium-170 Hafnium-172 Hafnium-173 Hafnium-175 Hafnium-177m Hafnium-178m Hafnium-179m Hafnium-180m Hafnium-181	Hafnium-182 Hafnium-182m Hafnium-183 Hafnium-184 Holmium-155 Holmium-157 Holmium-159 Holmium-161 Holmium-162	Holmium-162m Holmium-164 Holmium-164m Holmium-166 Holmium-166m Holmium-167 Hydrogen-3

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Krypton-74 Krypton-76 Krypton-77 Krypton-79	Krypton-81 Krypton-83m Krypton-85 Krypton-85m	Krypton-87 Krypton-88

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Lanthanum-131 Lanthanum-132 Lanthanum-135 Lanthanum-137 Lanthanum-138 Lanthanum-140 Lanthanum-141 Lanthanum-142 Lanthanum-143 Lead-195m Lead-198 Lead-199 Lead-200	Lead-201 Lead-202 Lead-202m Lead-203 Lead-205 Lead-209 Lead-210 Lead-211 Lead-212 Lead-214 Lutetium-169 Lutetium-170 Lutetium-171	Lutetium-172 Lutetium-173 Lutetium-174 Lutetium-174m Lutetium-176 Lutetium-176m Lutetium-177 Lutetium-177m Lutetium-178 Lutetium-178m Lutetium-179

[ A \| B \| C \| D \| E \| F \| G \| H \| I \| J \| K \| L \| M \| N \| O \| P \| Q \| R \| S \| T \| U \| V \| W \| X \| Y \| Z \| Unlisted ]
Magnesium-28 Manganese-51 Manganese-52 Manganese-52m Manganese-53 Manganese-54 Manganese-56 Mendelevium-257	Mendelevium-258 Mercury-193 Mercury-193m Mercury-194 Mercury-195 Mercury-195m Mercury-197 Mercury-197m	Mercury-199m Mercury-203 Molybdenum-90 Molybdenum-93 Molybdenum-93m Molybdenum-99 Molybdenum-101

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Neodymium-136 Neodymium-138 Neodymium-139 Neodymium-139m Neodymium-141 Neodymium-147 Neodymium-149 Neodymium-151 Neptunium-232 Neptunium-233 Neptunium-234 Neptunium-235	Neptunium-236 (1.15E+5 y) Neptunium-236m (22.5 h) Neptunium-237 Neptunium-238 Neptunium-239 Neptunium-240 Nickel-56 Nickel-57 Nickel-59 Nickel-63 Nickel-65 Nickel-66	Niobium-88 Niobium-89 (122 min) Niobium-89m (66 min) Niobium-90 Niobium-93m Niobium-94 Niobium-95 Niobium-95m Niobium-96 Niobium-97 Niobium-98 Nitrogen-13

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Osmium-180 Osmium-181 Osmium-182	Osmium-185 Osmium-189m Osmium-191	Osmium-191m Osmium-193 Osmium-194 Oxygen-15

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Palladium-100 Palladium-101 Palladium-103 Palladium-107 Palladium-109 Phosphorus-32 Phosphorus-33 Platinum-186 Platinum-188 Platinum-189 Platinum-191 Platinum-193 Platinum-193m Platinum-195m Platinum-197 Platinum-197m Platinum-199 Platinum-200 Plutonium-234 Plutonium-235 Plutonium-236 Plutonium-237 Plutonium-238	Plutonium-239 Plutonium-240 Plutonium-241 Plutonium-242 Plutonium-243 Plutonium-244 Plutonium-245 Plutonium-246 Polonium-203 Polonium-205 Polonium-207 Polonium-210 Potassium-40 Potassium-42 Potassium-43 Potassium-44 Potassium-45 Praseodymium-136 Praseodymium-137 Praseodymium-138m Praseodymium-139 Praseodymium-142 Praseodymium-142m	Praseodymium-143 Praseodymium-144 Praseodymium-145 Praseodymium-147 Promethium-141 Promethium-143 Promethium-144 Promethium-145 Promethium-146 Promethium-147 Promethium-148 Promethium-148m Promethium-149 Promethium-150 Promethium-151 Protactinium-227 Protactinium-228 Protactinium-230 Protactinium-231 Protactinium-232 Protactinium-233 Protactinium-234

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Tantalum-172 Tantalum-173 Tantalum-174 Tantalum-175 Tantalum-176 Tantalum-177 Tantalum-178 Tantalum-179 Tantalum-180 Tantalum-180m Tantalum-182 Tantalum-182m Tantalum-183 Tantalum-184 Tantalum-185 Tantalum-186 Technetium-93 Technetium-93m Technetium-94 Technetium-94m Technetium-95 Technetium-95m Technetium-96 Technetium-96m Technetium-97 Technetium-97m Technetium-98 Technetium-99 Technetium-99m Technetium-101 Technetium-104 Tellurium-116 Tellurium-121 Tellurium-121m Tellurium-123 Tellurium-123m Tellurium-125m	Tellurium-127 Tellurium-127m Tellurium-129 Tellurium-129m Tellurium-131 Tellurium-131m Tellurium-132 Tellurium-133 Tellurium-133m Tellurium-134 Terbium-147 Terbium-149 Terbium-150 Terbium-151 Terbium-153 Terbium-154 Terbium-155 Terbium-156 Terbium-156m (5.0 h) Terbium-156m (24.4 h) Terbium-157 Terbium-158 Terbium-160 Terbium-161 Thallium-194 Thallium-194m Thallium-195 Thallium-197 Thallium-198 Thallium-198m Thallium-199 Thallium-200 Thallium-201 Thallium-202 Thallium-204 Thorium-226 Thorium-227	Thorium-228 Thorium-229 Thorium-230 Thorium-231 Thorium-232 Thorium-234 Thulium-162 Thulium-166 Thulium-167 Thulium-170 Thulium-171 Thulium-172 Thulium-173 Thulium-175 Tin-110 Tin-111 Tin-113 Tin-117m Tin-119m Tin-121 Tin-121m Tin-123 Tin-123m Tin-125 Tin-126 Tin-127 Tin-128 Titanium-44 Titanium-45 Tungsten-176 Tungsten-177 Tungsten-178 Tungsten-179 Tungsten-181 Tungsten-185 Tungsten-187 Tungsten-188

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Uranium-230 Uranium-231 Uranium-232 Uranium-233	Uranium 234 Uranium-235 Uranium-236 Uranium-237	Uranium-238 Uranium-239 Uranium-240 Uranium-natural

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Vanadium-47	Vanadium-48	Vanadium-49

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Xenon-120 Xenon-121 Xenon-122 Xenon-123 Xenon-125	Xenon-127 Xenon-129m Xenon-131m Xenon-133 Xenon-133m	Xenon-135 Xenon-135m Xenon-138

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Ytterbium-162 Ytterbium-166 Ytterbium-167 Ytterbium-169 Ytterbium-175 Ytterbium-177 Ytterbium-178	Yttrium-86 Yttrium-86m Yttrium-87 Yttrium-88 Yttrium-90 Yttrium-90m Yttrium-91	Yttrium-91m Yttrium-92 Yttrium-93 Yttrium-94 Yttrium-95

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Zinc-62 Zinc-63 Zinc-65 Zinc-69 Zinc-69m	Zinc-71m Zinc-72 Zirconium-86 Zirconium-88 Zirconium-89	Zirconium-93 Zirconium-95 Zirconium-97

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Unlisted

Page Last Reviewed/Updated Wednesday, March 24, 2021