{"data":{"id":"us/10-cfr-appendix-b-to-part-30","jurisdiction":"us","citation":"10 CFR Appendix B to Part 30","heading":"Appendix B to Part 30—Quantities 1 of Licensed Material Requiring Labeling","body":"Material Microcuries\nAmericium-241 .01\nAntimony-122 100\nAntimony-124 10\nAntimony-125 10\nArsenic-73 100\nArsenic-74 10\nArsenic-76 10\nArsenic-77 100\nBarium-131 10\nBarium-133 10\nBarium-140 10\nBismuth-210 1\nBromine-82 10\nCadmium-109 10\nCadmium-115m 10\nCadmium-115 100\nCalcium-45 10\nCalcium-47 10\nCarbon-14 100\nCerium-141 100\nCerium-143 100\nCerium-144 1\nCesium-131 1,000\nCesium-134m 100\nCesium-134 1\nCesium-135 10\nCesium-136 10\nCesium-137 10\nChlorine-36 10\nChlorine-38 10\nChromium-51 1,000\nCobalt-58m 10\nCobalt-58 10\nCobalt-60 1\nCopper-64 100\nDysprosium-165 10\nDysprosium-166 100\nErbium-169 100\nErbium-171 100\nEuropium-152 9.2 h 100\nEuropium-152 13 yr 1\nEuropium-154 1\nEuropium-155 10\nFluorine-18 1,000\nGadolinium-153 10\nGadolinium-159 100\nGallium-72 10\nGermanium-71 100\nGold-198 100\nGold-199 100\nHafnium-181 10\nHolmium-166 100\nHydrogen-3 1,000\nIndium-113m 100\nIndium-114m 10\nIndium-115m 100\nIndium-115 10\nIodine-125 1\nIodine-126 1\nIodine-129 0.1\nIodine-131 1\nIodine-132 10\nIodine-133 1\nIodine-134 10\nIodine-135 10\nIridium-192 10\nIridium-194 100\nIron-55 100\nIron-59 10\nKrypton-85 100\nKrypton-87 10\nLanthanum-140 10\nLutetium-177 100\nManganese-52 10\nManganese-54 10\nManganese-56 10\nMercury-197m 100\nMercury-197 100\nMercury-203 10\nMolybdenum-99 100\nNeodymium-147 100\nNeodymium-149 100\nNickel-59 100\nNickel-63 10\nNickel-65 100\nNiobium-93m 10\nNiobium-95 10\nNiobium-97 10\nOsmium-185 10\nOsmium-191m 100\nOsmium-191 100\nOsmium-193 100\nPalladium-103 100\nPalladium-109 100\nPhosphorus-32 10\nPlatinum-191 100\nPlatinum-193m 100\nPlatinum-193 100\nPlatinum-197m 100\nPlatinum-197 100\nPlutonium-239 .01\nPolonium-210 0.1\nPotassium-42 10\nPraseodymium-142 100\nPraseodymium-143 100\nPromethium-147 10\nPromethium-149 10\nRadium-226 .01\nRhenium-186 100\nRhenium-188 100\nRhodium-103m 100\nRhodium-105 100\nRubidium-86 10\nRubidium-87 10\nRuthenium-97 100\nRuthenium-103 10\nRuthenium-105 10\nRuthenium-106 1\nSamarium-151 10\nSamarium-153 100\nScandium-46 10\nScandium-47 100\nScandium-48 10\nSelenium-75 10\nSilicon-31 100\nSilver-105 10\nSilver-110m 1\nSilver-111 100\nSodium-24 10\nStrontium-85 10\nStrontium-89 1\nStrontium-90 0.1\nStrontium-91 10\nStrontium-92 10\nSulphur-35 100\nTantalum-182 10\nTechnetium-96 10\nTechnetium-97m 100\nTechnetium-97 100\nTechnetium-99m 100\nTechnetium-99 10\nTellurium-125m 10\nTellurium-127m 10\nTellurium-127 100\nTellurium-129m 10\nTellurium-129 100\nTellurium-131m 10\nTellurium-132 10\nTerbium-160 10\nThallium-200 100\nThallium-201 100\nThallium-202 100\nThallium-204 10\nThorium (natural) 1 100\nThulium-170 10\nThulium-171 10\nTin-113 10\nTin-125 10\nTungsten-181 10\nTungsten-185 10\nTungsten-187 100\nUranium (natural) 2 100\nUranium-233 .01\nUranium-234—Uranium-235 .01\nVanadium-48 10\nXenon-131m 1,000\nXenon-133 100\nXenon-135 100\nYtterbium-175 100\nYttrium-90 10\nYttrium-91 10\nYttrium-92 100\nYttrium-93 100\nZinc-65 10\nZinc-69m 100\nZinc-69 1,000\nZirconium-93 10\nZirconium-95 10\nZirconium-97 10\nAny alpha emitting radionuclide not listed above or mixtures of alpha emitters of unknown composition .01\nAny radionuclide other than alpha emitting radionuclides, not listed above or mixtures of beta emitters of unknown composition .1\n1 Based on alpha disintegration rate of Th-232, Th-230 and their daughter products.\n2 Based on alpha disintegration rate of U-238, U-234, and U-235.\nNote:\nFor purposes of § 20.303, where there is involved a combination of isotopes in known amounts, the limit for the combination should be derived as follows: Determine, for each isotope in the combination, the ratio between the quantity present in the combination and the limit otherwise established for the specific isotope when not in combination. The sum of such ratios for all the isotopes in the combination may not exceed “1” (i.e., “unity”).","path":["Title 10—Energy","CHAPTER I—NUCLEAR REGULATORY COMMISSION","PART 30—RULES OF GENERAL APPLICABILITY TO DOMESTIC LICENSING OF BYPRODUCT MATERIAL"],"source_url":"https://www.ecfr.gov/api/versioner/v1/full/2026-08-25/title-10.xml","current_through":"2026-08-25","vintage":"","retrieved_at":"2026-08-27T02:24:09Z","sha256":"0448f9d79bed4f983cd9abdeb28368758e32b9f6322609e8e1aad46820503d21","source_id":"us-cfr","stale":true,"prev":"us/10-cfr-appendix-a-to-part-30","next":"us/10-cfr-appendix-c-to-part-30"},"notice":"GroundRules: Original legal text. Not legal advice."}