{
  "url": "https://openlegislation.uk/ionising-radiations-regulations-2017/schedule-7/part-1",
  "json_url": "https://openlegislation.uk/ionising-radiations-regulations-2017/schedule-7/part-1.json",
  "legislation": "uksi/2017/1075",
  "legislation_title": "The Ionising Radiations Regulations 2017",
  "legislation_url": "https://openlegislation.uk/ionising-radiations-regulations-2017",
  "path": "schedule/7/part/1",
  "kind": "part",
  "number": "1",
  "heading": "Table of artificial radionuclides and naturally occurring radionuclides (which are processed for their radioactive, fissile or fertile properties)",
  "text": "1 Potassium salts in quantities less than 1,000kg are exempt.\n1\n2\n3\n4\n5\n6\nRadionuclide name, symbol, isotope\nConcentration for: Notification (any amount of radioactive material); Registration (amounts of radioactive material that exceed 1,000kg)\nQuantity for Notification\nConcentration for Registration (amounts of radioactive material that do not exceed 1,000kg)\nQuantity for notification of occurrences\nQuantity for notification of occurrences\nRegulation 5(1) and Schedule 1, paragraph 1(a);regulation 6(2)(f)\nRegulation 5(1) and Schedule 1, paragraph 1(b)\nRegulation 6(2)(e)\nRegulation 31(1)\nRegulation 31(3)\n(Bq/g)\n(Bq)\n(Bq/g)\n(Bq)\n(Bq)\nHydrogen\nH-3 (tritiated compounds)\n102\n109\n106\n1012\n1010\nBeryllium\nBe-7\n10\n107\n103\n1012\n108\nCarbon\nC-11\n0.01\n106\n10\n1013\n107\nC-11 (monoxide)\n0.01\n109\n10\n1012\n1010\nC-11 (dioxide)\n0.01\n109\n10\n1012\n1010\nC-14\n1\n107\n104\n1011\n108\nOxygen\nO-15\n0.01\n109\n102\n1010\nFluorine\nF-18\n10\n106\n10\n1013\n107\nSodium\nNa-22\n0.1\n106\n10\n1010\n107\nNa-24\n0.1\n105\n10\n1011\n106\nSilicon\nSi-31\n103\n106\n103\n1013\n107\nPhosphorus\nP-32\n103\n105\n103\n1010\n106\nP-33\n103\n108\n105\n1011\n109\nSulphur\nS-35\n102\n108\n105\n1011\n109\nChlorine\nCl-36\n1\n106\n104\n1010\n107\nCl-38\n10\n105\n10\n1013\n106\nArgon\nAr-37\n0.01\n108\n106\n1013\nAr-41\n0.01\n109\n102\n109\nPotassium\nK-401\n1\n106\n102\n1010\n107\nK-42\n102\n106\n102\n1012\n107\nK-43\n10\n106\n10\n1011\n107\nCalcium\nCa-45\n102\n107\n104\n1010\n108\nCa-47\n10\n106\n10\n1011\n107\nScandium\nSc-46\n0.1\n106\n10\n1010\n107\nSc-47\n102\n106\n102\n1011\n107\nSc-48\n1\n105\n10\n1011\n106\nVanadium\nV-48\n1\n105\n10\n1010\n106\nChromium\nCr-51\n102\n107\n103\n1012\n108\nManganese\nMn-51\n10\n105\n10\n1013\n106\nMn-52\n1\n105\n10\n1010\n106\nMn-52m\n10\n105\n10\n1013\n106\nMn-53\n102\n109\n104\n1012\n1010\nMn-54\n0.1\n106\n10\n1011\n107\nMn-56\n10\n105\n10\n1012\n106\nIron\nFe-52+\n10\n106\n10\n1012\n107\nFe-55\n103\n106\n104\n1011\n107\nFe-59\n1\n106\n10\n1010\n107\nCobalt\nCo-55\n10\n106\n10\n1011\n107\nCo-56\n0.1\n105\n10\n1010\n106\nCo-57\n1\n106\n102\n1011\n107\nCo-58\n1\n106\n10\n1010\n107\nCo-58m\n104\n107\n104\n1013\n108\nCo-60\n0.1\n105\n10\n1010\n106\nCo-60m\n103\n106\n103\n1016\n107\nCo-61\n102\n106\n102\n1013\n107\nCo-62m\n10\n105\n10\n1013\n106\nNickel\nNi-59\n102\n108\n104\n1011\n109\nNi-63\n102\n108\n105\n1011\n109\nNi-65\n10\n106\n10\n1013\n107\nCopper\nCu-64\n102\n106\n102\n1012\n107\nZinc\nZn-65\n0.1\n106\n10\n1010\n107\nZn-69\n103\n106\n104\n1014\n107\nZn-69m+\n10\n106\n102\n1012\n107\nGallium\nGa-68\n0.01\n105\n10\n1013\n106\nGa-72\n10\n105\n10\n1011\n106\nGermanium\nGe-68+\n0.01\n105\n10\n1010\n106\nGe-71\n104\n108\n104\n1013\n109\nArsenic\nAs-73\n103\n107\n103\n1011\n108\nAs-74\n10\n106\n10\n1011\n107\nAs-76\n10\n105\n102\n1011\n106\nAs-77\n103\n106\n103\n1012\n107\nSelenium\nSe-75\n1\n106\n102\n1011\n107\nBromine\nBr-82\n1\n106\n10\n1011\n107\nKrypton\nKr-74\n0.01\n109\n102\n109\nKr-76\n0.01\n109\n102\n1010\nKr-77\n0.01\n109\n102\n109\nKr-79\n0.01\n105\n103\n1010\nKr-81\n0.01\n107\n104\n1011\nKr-83m\n0.01\n1012\n105\n1012\nKr-85\n0.01\n104\n105\n1012\nKr-85m\n0.01\n1010\n103\n1010\nKr-87\n0.01\n109\n102\n109\nKr-88\n0.01\n109\n102\n109\nRubidium\nRb-86\n102\n105\n102\n1011\n106\nStrontium\nSr-85\n1\n106\n102\n1011\n107\nSr-85m\n102\n107\n102\n1013\n108\nSr-87m\n102\n106\n102\n1013\n107\nSr-89\n103\n106\n103\n1010\n107\nSr-90+\n1\n104\n102\n109\n105\nSr-91+\n10\n105\n10\n1012\n106\nSr-92\n10\n106\n10\n1012\n107\nYttrium\nY-90\n103\n105\n103\n1011\n106\nY-91\n102\n106\n103\n1010\n107\nY-91m\n102\n106\n102\n1013\n107\nY-92\n102\n105\n102\n1012\n106\nY-93\n102\n105\n102\n1012\n106\nZirconium\nZr-93+\n10\n107\n103\n109\n108\nZr-95+\n1\n106\n10\n1010\n107\nZr-97+\n10\n105\n10\n1011\n106\nNiobium\nNb-93m\n10\n107\n104\n1011\n108\nNb-94\n0.1\n106\n10\n109\n107\nNb-95\n1\n106\n10\n1011\n107\nNb-97+\n10\n106\n10\n1013\n107\nNb-98\n10\n105\n10\n1013\n106\nMolybdenum\nMo-90\n10\n106\n10\n1012\n107\nMo-93\n10\n108\n103\n1011\n109\nMo-99+\n10\n106\n102\n1011\n107\nMo-101+\n10\n106\n10\n1013\n107\nTechnetium\nTc-96\n1\n106\n10\n1011\n107\nTc-96m\n103\n107\n103\n1014\n108\nTc-97\n10\n108\n103\n1012\n109\nTc-97m\n102\n107\n103\n1010\n108\nTc-99\n1\n107\n104\n1010\n108\nTc-99m\n102\n107\n102\n1013\n108\nRuthenium\nRu-97\n10\n107\n102\n1012\n108\nRu-103+\n1\n106\n102\n1010\n107\nRu-105+\n10\n106\n10\n1012\n107\nRu-106+\n0.1\n105\n102\n109\n106\nRhodium\nRh-103m\n104\n108\n104\n1015\n109\nRh-105\n102\n107\n102\n1012\n108\nPalladium\nPd-103+\n103\n108\n103\n1011\n109\nPd-109+\n102\n106\n103\n1012\n107\nSilver\nAg-105\n1\n106\n102\n1011\n107\nAg-108m+\n0.1\n106\n10\n1010\n107\nAg-110m+\n0.1\n106\n10\n1010\n107\nAg-111\n102\n106\n103\n1011\n107\nCadmium\nCd-109+\n1\n106\n104\n1010\n107\nCd-115+\n10\n106\n102\n1011\n107\nCd-115m+\n102\n106\n103\n1010\n107\nIndium\nIn-111\n10\n106\n102\n1011\n107\nIn-113m\n102\n106\n102\n1013\n107\nIn-114m+\n10\n106\n102\n1010\n107\nIn-115m\n102\n106\n102\n1013\n107\nTin\nSn-113+\n1\n107\n103\n1011\n108\nSn-125\n10\n105\n102\n1010\n106\nAntimony\nSb-122\n10\n104\n102\n1011\n105\nSb-124\n1\n106\n10\n1010\n107\nSb-125+\n0.1\n106\n102\n1010\n107\nTellurium\nTe-123m\n1\n107\n102\n1010\n108\nTe-125m\n103\n107\n103\n1010\n108\nTe-127\n103\n106\n103\n1012\n107\nTe-127m+\n10\n107\n103\n1010\n108\nTe-129\n102\n106\n102\n1014\n107\nTe-129m+\n10\n106\n103\n1010\n107\nTe-131\n102\n105\n102\n1014\n106\nTe-131m+\n10\n106\n10\n1011\n107\nTe-132+\n1\n107\n102\n1011\n108\nTe-133\n10\n105\n10\n1014\n106\nTe-133m\n10\n105\n10\n1013\n106\nTe-134\n10\n106\n10\n1013\n107\nIodine\nI-123\n102\n107\n102\n1012\n108\nI-125\n102\n106\n103\n1010\n107\nI-126\n10\n106\n102\n1010\n107\nI-129\n0.01\n105\n102\n109\n106\nI-130\n10\n106\n10\n1011\n107\nI-131\n10\n106\n102\n1010\n107\nI-132\n10\n105\n10\n1012\n106\nI-133\n10\n106\n10\n1011\n107\nI-134\n10\n105\n10\n1013\n106\nI-135\n10\n106\n10\n1012\n107\nXenon\nXe-131m\n0.01\n104\n104\n1011\nXe-133\n0.01\n104\n103\n1011\nXe-135\n0.01\n1010\n103\n1010\nCaesium\nCs-129\n10\n105\n102\n1012\n106\nCs-131\n103\n106\n103\n1012\n107\nCs-132\n10\n105\n10\n1011\n106\nCs-134\n0.1\n104\n10\n1010\n105\nCs-134m\n103\n105\n103\n1014\n106\nCs-135\n102\n107\n104\n1011\n108\nCs-136\n1\n105\n10\n1010\n106\nCs-137+\n0.1\n104\n10\n1010\n105\nCs-138\n10\n104\n10\n1013\n105\nBarium\nBa-131\n10\n106\n102\n1011\n107\nBa-140+\n1\n105\n10\n1011\n106\nLanthanum\nLa-140\n1\n105\n10\n1011\n106\nCerium\nCe-139\n1\n106\n102\n1011\n107\nCe-141\n102\n107\n102\n1010\n108\nCe-143\n10\n106\n102\n1011\n107\nCe-144+\n10\n105\n102\n109\n106\nPraseodymium\nPr-142\n102\n105\n102\n1012\n106\nPr-143\n103\n106\n104\n1011\n107\nNeodymium\nNd-147\n102\n106\n102\n1011\n107\nNd-149\n102\n106\n102\n1013\n107\nPromethium\nPm-147\n103\n107\n104\n1010\n108\nPm-149\n103\n106\n103\n1011\n107\nSamarium\nSm-151\n103\n108\n104\n1010\n109\nSm-153\n102\n106\n102\n1011\n107\nEuropium\nEu-152\n0.1\n106\n10\n109\n107\nEu-152m\n102\n106\n102\n1012\n107\nEu-154\n0.1\n106\n10\n109\n107\nEu-155\n1\n107\n102\n1010\n108\nGadolinium\nGd-153\n10\n107\n102\n1010\n108\nGd-159\n102\n106\n103\n1012\n107\nTerbium\nTb-160\n1\n106\n1\n1010\n107\nDysprosium\nDy-165\n103\n106\n103\n1013\n107\nDy-166\n102\n106\n103\n1011\n107\nHolmium\nHo-166\n102\n105\n103\n1011\n106\nErbium\nEr-169\n103\n107\n104\n1011\n108\nEr-171\n102\n106\n102\n1012\n107\nThulium\nTm-170\n102\n106\n103\n1010\n107\nTm-171\n103\n108\n104\n1011\n109\nYtterbium\nYb-175\n102\n107\n103\n1011\n108\nLutetium\nLu-177\n102\n107\n103\n1011\n108\nHafnium\nHf-181\n1\n106\n10\n1010\n107\nTantalum\nTa-182\n0.1\n104\n10\n1010\n105\nTungsten\nW-181\n10\n107\n103\n1012\n108\nW-185\n103\n107\n104\n1011\n108\nW-187\n10\n106\n102\n1012\n107\nRhenium\nRe-186\n103\n106\n103\n1011\n107\nRe-188\n102\n105\n102\n1012\n106\nOsmium\nOs-185\n1\n106\n10\n1011\n107\nOs-191\n102\n107\n102\n1011\n108\nOs-191m\n103\n107\n103\n1012\n108\nOs-193\n102\n106\n102\n1011\n107\nIridium\nIr-190\n1\n106\n10\n1010\n107\nIr-192\n1\n104\n10\n1010\n105\nIr-194\n102\n105\n102\n1011\n106\nPlatinum\nPt-191\n10\n106\n102\n1011\n107\nPt-193m\n103\n107\n103\n1012\n108\nPt-197\n10\n106\n103\n1012\n107\nPt-197m\n102\n106\n102\n1014\n107\nGold\nAu-198\n10\n106\n102\n1011\n107\nAu-199\n102\n106\n102\n1011\n107\nMercury\nHg-197\n102\n107\n102\n1012\n108\nHg-197m\n102\n106\n102\n1012\n107\nHg-203\n10\n105\n102\n1011\n106\nThallium\nTl-200\n10\n106\n10\n1011\n107\nTl-201\n102\n106\n102\n1012\n107\nTl-202\n10\n106\n102\n1011\n107\nTl-204\n1\n104\n104\n1011\n105\nLead\nPb-203\n10\n106\n102\n1012\n107\nPb-210+\n0.01\n104\n10\n108\n105\nPb-212+\n1\n105\n10\n1010\n106\nBismuth\nBi-206\n1\n105\n10\n1010\n106\nBi-207\n0.1\n106\n10\n1010\n107\nBi-210\n10\n106\n103\n109\n107\nBi-212+\n1\n105\n10\n1011\n106\nPolonium\nPo-203\n10\n106\n10\n1013\n107\nPo-205\n10\n106\n10\n1012\n107\nPo-207\n10\n106\n10\n1012\n107\nPo-210\n0.01\n104\n10\n107\n105\nAstatine\nAt-211\n103\n107\n103\n1010\n108\nRadon\nRn-220+\n0.01\n107\n104\n108\n108\nRn-222+\n0.01\n108\n10\n109\n109\nRadium\nRa-223+\n1\n105\n102\n107\n106\nRa-224+\n1\n105\n10\n108\n106\nRa-225\n10\n105\n102\n107\n106\nRa-226+\n0.01\n104\n10\n107\n105\nRa-227\n102\n106\n102\n1013\n107\nRa-228+\n0.01\n105\n10\n108\n106\nActinium\nAc-228\n1\n106\n10\n1010\n107\nThorium\nTh-226+\n103\n107\n103\n1011\n108\nTh-227\n1\n104\n10\n107\n105\nTh-228+\n0.1\n104\n1\n106\n105\nTh-229+\n0.1\n103\n1\n106\n104\nTh-230\n0.1\n104\n1\n106\n105\nTh-231\n102\n107\n103\n1012\n108\nTh-232\n0.01\n104\n10\n106\n105\nTh-234+\n10\n105\n103\n1010\n106\nProtactinium\nPa-230\n10\n106\n10\n108\n107\nPa-231\n0.01\n103\n1\n106\n104\nPa-233\n10\n107\n102\n1010\n108\nUranium\nU-230+\n10\n105\n10\n107\n106\nU-231\n102\n107\n102\n1011\n108\nU-232+\n0.1\n103\n1\n106\n104\nU-233\n1\n104\n10\n107\n105\nU-234\n1\n104\n10\n107\n105\nU-235+\n1\n104\n10\n107\n105\nU-236\n10\n104\n10\n107\n105\nU-237\n102\n106\n102\n1011\n107\nU-238+\n1\n104\n10\n107\n105\nU-239\n102\n106\n102\n1014\n107\nU-240\n0.01\n107\n103\n1012\n108\nU-240+\n102\n106\n10\n1011\n107\nNeptunium\nNp-237+\n1\n103\n1\n107\n104\nNp-239\n102\n107\n102\n1011\n108\nNp-240\n10\n106\n10\n1013\n107\nPlutonium\nPu-234\n102\n107\n102\n1010\n108\nPu-235\n102\n107\n102\n1014\n108\nPu-236\n1\n104\n10\n107\n105\nPu-237\n102\n107\n103\n1011\n108\nPu-238\n0.1\n104\n1\n106\n105\nPu-239\n0.1\n104\n1\n106\n105\nPu-240\n0.1\n103\n1\n106\n104\nPu-241\n10\n105\n102\n108\n106\nPu-242\n0.1\n104\n1\n106\n105\nPu-243\n103\n107\n103\n1013\n108\nPu-244+\n0.1\n104\n1\n106\n105\nAmericium\nAm-241\n0.1\n104\n1\n106\n105\nAm-242\n103\n106\n103\n1010\n107\nAm-242m+\n0.1\n104\n1\n106\n105\nAm-243+\n0.1\n103\n1\n106\n104\nCurium\nCm-242\n10\n105\n102\n107\n106\nCm-243\n1\n104\n1\n107\n105\nCm-244\n1\n104\n10\n107\n105\nCm-245\n0.1\n103\n1\n106\n104\nCm-246\n0.1\n103\n1\n106\n104\nCm-247+\n0.1\n104\n1\n106\n105\nCm-248\n0.1\n103\n1\n106\n104\nBerkelium\nBk-249\n102\n106\n103\n109\n107\nCalifornium\nCf-246\n103\n106\n103\n109\n107\nCf-248\n1\n104\n10\n107\n105\nCf-249\n0.1\n103\n1\n106\n104\nCf-250\n1\n104\n10\n106\n105\nCf-251\n0.1\n103\n1\n106\n104\nCf-252\n1\n104\n10\n107\n105\nCf-253\n102\n105\n102\n108\n106\nCf-254\n1\n103\n1\n107\n104\nEinsteinium\nEs-253\n102\n105\n102\n108\n106\nEs-254+\n0.1\n104\n10\n107\n105\nEs-254m+\n10\n106\n102\n109\n107\nFermium\nFm-254\n104\n107\n104\n1010\n108\nFm-255\n102\n106\n103\n109\n107\nOther radionuclides not listed above (see Note 1)\n0.01\n103\n0.1\n105\n104\nNote 1\nIn the case of radionuclides not specified elsewhere in this Part, the quantities specified in this entry are to be used unless the Executive has approved some other quantity for that radionuclide.\nNote 2\nNuclides carrying the suffix “+” in the above table represent parent nuclides and their progeny as listed in the table below. The dose contributions for those progeny are taken into account in the dose calculation (thus requiring only the exemption level of the parent radionuclide to be considered).\nList of parent nuclides and their progeny as referred to in Note 2 above\nParent radionuclide\nProgeny\nFe-52\nMn-52m\nZn-69m\nZn-69\nGe-68\nGa-68\nSr-90\nY-90\nSr-91\nY-91m\nZr-93\nNb-93m\nZr-95\nNb-95\nZr-97\nNb-97m, Nb-97\nNb-97\nNb-97m\nMo-99\nTc-99m\nMo-101\nTc-101\nRu-103\nRh-103m\nRu-105\nRh-105m\nRu-106\nRh-106\nPd-103\nRh-103m\nPd-109\nAg-109m\nAg-108m\nAg-108\nAg-110m\nAg-110\nCd-109\nAg-109m\nCd-115\nIn-115m\nCd-115m\nIn-115m\nIn-114m\nIn-114\nSn-113\nIn-113m\nSb-125\nTe-125m\nTe-127m\nTe-127\nTe-129m\nTe-129\nTe-131m\nTe-131\nTe-132\nI-132\nCs-137\nBa-137m\nBa-140\nLa-140\nCe-144\nPr-144, Pr-144m\nPb-210\nBi-210, Po-210\nPb-212\nBi-212, Tl-208, Po-212\nBi-212\nTl-208, Po-212\nRn-220\nPo-216\nRn-222\nPo-218, Pb-214, Bi-214, Po-214\nRa-223\nRn-219, Po-215, Pb-211, Bi-211, Tl-207\nRa-224\nRn-220, Po-216, Pb-212, Bi-212, Tl-208, Po-212\nRa-226\nRn-222, Po-218, Pb-214, Bi-214, Po-214, Pb-210, Bi-210, Po-210\nRa-228\nAc-228\nTh-226\nRa-222, Rn-218, Po-214\nTh-228\nRa-224, Rn-220, Po-216, Pb-212, Bi-212, Tl-208, Po-212\nTh-229\nRa-225, Ac-225, Fr-221, At-217, Bi-213, Po-213, Pb-209\nTh-234\nPa-234m\nU-230\nTh-226, Ra-222, Rn-218, Po-214\nU-232\nTh-228, Ra-224, Rn-220, Po-216, Pb-212, Bi-212, Tl-208, Po-212\nU-235\nTh-231\nU-238\nTh-234, Pa-234m\nU-240\nNp-240m, Np-240\nNp-237\nPa-233\nPu-244\nU-240, Np-240m, Np-240\nAm-242m\nAm-242, Np-238\nAm-243\nNp-239\nCm-247\nPu-243\nEs-254\nBk-250\nEs-254m\nFm-254",
  "extent": null,
  "status": null,
  "version": "current",
  "annotations": [],
  "outstanding_effects": [],
  "provenance": {
    "source": "legislation.gov.uk",
    "source_url": "https://www.legislation.gov.uk/uksi/2017/1075/schedule/7/part/1",
    "retrieved_at": "2026-10-28T23:06:45.309431+00:00"
  },
  "licence": "Open Government Licence v3.0",
  "licence_url": "https://www.nationalarchives.gov.uk/doc/open-government-licence/version/3/",
  "attribution": "Contains public sector information licensed under the Open Government Licence v3.0. Source: legislation.gov.uk, The National Archives."
}