{"data":{"id":"us-va/12vac5-481-3720","jurisdiction":"us-va","citation":"12VAC5-481-3720","heading":"Exempt concentrations schedule","body":"Element (atomic number)\n\nIsotope\n\nCol. I\n\nCol. II\n\nGas Concentration μCi/ml1\n\nLiquid and Solid Concentration μCi/ml2\n\nAntimony (51)\n\nSb-122\n\n3 x 10-4\n\nSb-124\n\n2 x 10-4\n\nSb-125\n\n1 x 10-3\n\nArgon (18)\n\nA-37\n\n1 x 10-3\n\nA-41\n\n4 x 10-7\n\nArsenic (33)\n\nAs-73\n\n5 x 10-3\n\nAs-74\n\n5 x 10-4\n\nAs-76\n\n2 x 10-4\n\nAs-77\n\n8 x 10-4\n\nBarium (56)\n\nBa-131\n\n2 x 10-3\n\nBa-140\n\n3 x 10-4\n\nBeryllium (4)\n\nBe-7\n\n2 x 10-2\n\nBismuth (83)\n\nBi-206\n\n4 x 10-4\n\nBromine (35)\n\nBr-82\n\n4 x 10-7\n\n3 x 10-3\n\nCadmium (48)\n\nCd-109\n\n2 x 10-3\n\nCd-115M\n\n3 x 10-4\n\nCd-115\n\n3 x 10-4\n\nCalcium (20)\n\nCa-45\n\n9 x 10-5\n\nCa-47\n\n5 x 10-4\n\nCarbon (6)\n\nC-14\n\n1 x 10-6\n\n8 x 10-3\n\nCerium (58)\n\nCe-141\n\n9 x 10-4\n\nCe-143\n\n4 x 10-4\n\nCe-144\n\n1 x 10-4\n\nCesium (55)\n\nCs-131\n\n2 x 10-2\n\nCs-134m\n\n6 x 10-2\n\nCs-134\n\n9 x 10-5\n\nChlorine (17)\n\nCl-38\n\n9 x 10-7\n\n4 x 10-3\n\nChromium (24)\n\nCr-51\n\n2 x 10-2\n\nCobalt (27)\n\nCo-57\n\n5 x 10-3\n\nCo-58\n\n1 x 10-3\n\nCo-60\n\n5 x 10-4\n\nCopper (29)\n\nCu-64\n\n3 x 10-3\n\nDysprosium (66)\n\nDy-165\n\n4 x 10-3\n\nDy-166\n\n4 x 10-4\n\nErbium (68)\n\nEr-169\n\n9 x 10-4\n\nEr-171\n\n1 x 10-3\n\nEuropium (63)\n\nEu-152\n\n(9.2 hrs)\n\n6 x 10-4\n\nEu-155\n\n2 x 10-3\n\nFluorine (9)\n\nF-18\n\n2 x 10-6\n\n8 x 10-3\n\nGadolinium (64)\n\nGd-153\n\n2 x 10-3\n\nGd-159\n\n8 x `0-4\n\nGallium (31)\n\nGa-72\n\n4 x 10-4\n\nGermanium (32)\n\nGe-71\n\n2 x 10-2\n\nGold (79)\n\nAu-196\n\n2 x 10-3\n\nAu-198\n\n5 x 10-4\n\nAu-199\n\n2 x 10-3\n\nHafnium (72)\n\nHf-81\n\n7 x 10-4\n\nHydrogen (1)\n\nH-3\n\n5 x 10-6\n\n3 x 10-2\n\nIndium (49)\n\nIn-113M\n\n1 x 10-2\n\nIn-114M\n\n2 x 10-4\n\nIodine (53)\n\nI-126\n\n3 x 10-9\n\n2 x 10-5\n\nI-131\n\n3 x 10-9\n\n2 x 10-5\n\nI-132\n\n8 x 10-8\n\n6 x 10-4\n\nI-133\n\n1 x 10-8\n\n7 x 10-5\n\nI-134\n\n2 x 10-7\n\n1 x 10-3\n\nIridium (77)\n\nIr-190\n\n2 x 10-3\n\nIr-192\n\n4 x 10-4\n\nIr-194\n\n3 x 10-4\n\nIron (26)\n\nFe-55\n\n8 x 10-3\n\nFe-59\n\n6 x 10-4\n\nKrypton (36)\n\nKr-85M\n\n1 x 10-6\n\nKr-85\n\n3 x 10-6\n\nLanthanum (57)\n\nLa-140\n\n2 x 10-4\n\nLead (82)\n\nPb-203\n\n4 x 10-3\n\nLutetium (71)\n\nLu-177\n\n1 x 10-3\n\nManganese (25)\n\nMn-52\n\n3 x 10-4\n\nMn-54\n\n1 x 10-3\n\nMn-56\n\n1 x 10-3\n\nMercury (80)\n\nHg-197M\n\n2 x 10-3\n\nHg-197\n\n3 x 10-3\n\nHg-203\n\n2 x 10-4\n\nMolybdenum (42)\n\nMo-99\n\n2 x 10-3\n\nNeodymium (60)\n\nNd-147\n\n6 x 10-4\n\nNd-149\n\n3 x 10-3\n\nNickel (28)\n\nNi-65\n\n1 x 10-3\n\nNiobium (Columbium) (41)\n\nNb-95\n\n1 x 10-3\n\nNb-97\n\n9 x 10-3\n\nOsmium (76)\n\nOs-185\n\n7 x 10-4\n\nOs-191M\n\n3 x 10-2\n\nOs-191\n\n2 x 10-3\n\nOs-193\n\n6 x 10-4\n\nPalladium (46)\n\nPd-103\n\n3 x 10-3\n\nPd-109\n\n9 x 10-4\n\nPhosphorus (15)\n\nP-32\n\n2 x 10-4\n\nPlatinum (78)\n\nPt-191\n\n1 x 10-3\n\nPt-193M\n\n1 x 10-2\n\nPt-197M\n\n1 x 10-2\n\nPt-197\n\n1 x 10-3\n\nPotassium (19)\n\nK-42\n\n3 x 10-3\n\nPraseodymium (59)\n\nPr-142\n\n3 x 10-4\n\nPr-143\n\n5 x 10-4\n\nPromethium (61)\n\nPm-147\n\n2 x 10-3\n\nPm-149\n\n4 x 10-4\n\nRhenium (75)\n\nRe-183\n\n6 x 10-3\n\nRe-186\n\n9 x 10-4\n\nRe-188\n\n6 x 10-4\n\nRhodium (45)\n\nRh-103M\n\n1 x 10-1\n\nRh-105\n\n1 x 10-3\n\nRubidium (37)\n\nRb-86\n\n7 x 10-4\n\nRuthenium (44)\n\nRu-97\n\n4 x 10-4\n\nRu-103\n\n8 x 10-4\n\nRu-105\n\n1 x 10-3\n\nRu-106\n\n1 x 10-4\n\nSamarium (62)\n\nSm-153\n\n8 x 10-4\n\nScandium (21)\n\nSc-46\n\n4 x 10-4\n\nSc-47\n\n9 x 10-4\n\nSc-48\n\n3 x 10-4\n\nSelenium (34)\n\nSe-75\n\n3 x 10-3\n\nSilicon (14)\n\nSi-31\n\n9 x 10-3\n\nSilver (47)\n\nAg-105\n\n1 x 10-3\n\nAg-110M\n\n3 x 10-4\n\nAg-111\n\n4 x 10-4\n\nSodium (11)\n\nNa-24\n\n2 x 10-3\n\nStrontium (38)\n\nSr-85\n\n1 x 10-4\n\nSr-89\n\n1 x 10-4\n\nSr-91\n\n7 x 10-4\n\nSr-92\n\n7 x 10-4\n\nSulfur (16)\n\nS-35\n\n9 x 10-8\n\n6 x 10-4\n\nTantalum (73)\n\nTa-182\n\n4 x 10-4\n\nTechnetium (43)\n\nTc-96M\n\n1 x 10-1\n\nTc-96\n\n1 x 10-3\n\nTellurium (52)\n\nTe-125M\n\n2 x 10-3\n\nTe-125M\n\n6 x 10-4\n\nTe-127\n\n3 x 10-3\n\nTe-129M\n\n3 x 10-4\n\nTe-131M\n\n6 x 10-4\n\nTe-132\n\n3 x 10-4\n\nTerbium (65)\n\nTb-160\n\n4 x 10-4\n\nThallium (81)\n\nTl-200\n\n4 x 10-3\n\nTl-201\n\n3 x 10-3\n\nTl-202\n\n1 x 10-3\n\nTl-204\n\n1 x 10-3\n\nThulium (69)\n\nTm-170\n\n5 x 10-4\n\nTm-171\n\n5 x 10-3\n\nTin (50)\n\nSn-113\n\n9 x 10-4\n\nSn-125\n\n2 x 10-4\n\nTungsten (Wolfram) (74)\n\nW-181\n\n4 x 10-3\n\nW-187\n\n7 x 10-4\n\nVanadium (23)\n\nV-48\n\n3 x 10-4\n\nXenon (54)\n\nXe-131M\n\n4 x 10-6\n\nXe-133\n\n3 x 10-6\n\nXe-135\n\n1 x 10-6\n\nYtterbium (70)\n\nYb-175\n\n1 x 10-3\n\nYttrium (39)\n\nY-90\n\n2 x 10-4\n\nY-91M\n\n3 x 10-2\n\nY-91\n\n3 x 10-4\n\nY-92\n\n6 x 10-4\n\nY-93\n\n3 x 10-4\n\nZinc (30)\n\nZn-65\n\n1 x 10-3\n\nZn-69M\n\n7 x 10-4\n\nZn-69\n\n2 x 10-2\n\nZirconium (40)\n\nZr-95\n\n6 x 10-4\n\nZr-97\n\n2 x 10-4\n\nBeta and/or gamma emitting\n\nradioactive material not\n\nlisted above with half-life\n\nless than three years\n\n1 x 10-10\n\n1 x 10-6\n\nFootnotes:\n\n1Values are given only for those materials   normally used as gases.\n\n2μCi/gm for solids.\n\nNOTE 1: Many radioisotopes disintegrate into isotopes that are also radioactive. In expressing the concentrations, the activity stated is that of the parent isotope and takes into account the daughters.\n\nNOTE 2: For purposes of 12VAC5-481-400 A where there is involved a combination of isotopes, the limit for the combination should be derived as follows:\n\nDetermine for each isotope in the product the ratio between the concentration present in the product and the exempt concentration for the specific isotope when not in combination. The sum of such ratios may not exceed \"1\" (i.e., unity).\n\nExample:","path":["Title 12. Health","Agency 5. Department of Health","Chapter 481. Virginia Radiation Protection Regulations","Part XVII. Schedules","Article 7. Notification"],"source_url":"https://law.lis.virginia.gov/admincode/title12/agency5/chapter481/section3720/","current_through":"2026 Regular Session (effective July 1, 2026)","vintage":"","retrieved_at":"2026-09-14T04:50:33Z","sha256":"09690ba1ce06059e6638d99005ecfb8a95a5a73efc6c929c21a14f387e5524fa","source_id":"us-va-vac","stale":false,"prev":"us-va/12vac5-481-3710","next":"us-va/12vac5-481-3730"},"notice":"GroundRules: Original legal text. Not legal advice."}