{"data":{"id":"us/10-cfr-30.70","jurisdiction":"us","citation":"10 CFR 30.70","heading":"Schedule A—Exempt concentrations.","body":"[See footnotes at end of this table]\nElement (atomic number) Isotope Col. I Col. II\nGas concentration µCi/ml 1 Liquid and solid concentration µCi/ml 2\nAntimony (51) Sb 122 3 × 10−4\nSb 124 2 × 10−4\nSb 125 1 × 10−3\nArgon (18) A 37 1 × 10−3\nA 41 4 × 10−7\nArsenic (33) As 73 5 × 10−3\nAs 74 5 × 10−4\nAs 76 2 × 10−4\nAs 77 8 × 10−4\nBarium (56) Ba 131 2 × 10−3\nBa 140 3 × 10−4\nBeryllium (4) Be 7 2 × 10−2\nBismuth (83) Bi 206 4 × 10−4\nBromine (35) Br 82 4 × 10−7 3 × 10−3\nCadmium (48) Cd 109 2 × 10−3\nCd 115m 3 × 10−4\nCd 115 3 × 10−4\nCalcium (20) Ca 45 9 × 10−5\nCa 47 5 × 10−4\nCarbon (6) C 14 1 × 10−6 8 × 10−3\nCerium (58) Ce 141 9 × 10−4\nCe 143 4 × 10−4\nCe 144 1 × 10−4\nCesium (55) Cs 131 2 × 10−2\nCs 134m 6 × 10−2\nCs 134 9 × 10−5\nChlorine (17) Cl 38 9 × 10−7 4 × 10−3\nChromium (24) Cr 51 2 × 10−2\nCobalt (27) Co 57 5 × 10−3\nCo 58 1 × 10−3\nCo 60 5 × 10−4\nCopper (29) Cu 64 3 × 10−3\nDysprosium (66) Dy 165 4 × 10−3\nDy 166 4 × 10−4\nErbium (68) Er 169 9 × 10−4\nEr 171 1 × 10−3\nEuropium (63) Eu 152 6 × 10−4\n(T/2 = 9.2 Hrs)\nEu 155 2 × 10−3\nFluorine (9) F 18 2 × 10−6 8 × 10−3\nGadolinium (64) Gd 153 2 × 10−3\nGd 159 8 × 10−4\nGallium (31) Ga 72 4 × 10−4\nGermanium (32) Ge 71 2 × 10−2\nGold (79) Au 196 2 × 10−3\nAu 198 5 × 10−4\nAu 199 2 × 10−3\nHafnium (72) Hf 181 7 × 10−4\nHydrogen (1) H 3 5 × 10−6 3 × 10−2\nIndium (49) In 113m 1 × 10−2\nIn 114m 2 × 10−4\nIodine (53) I 126 3 × 10−9 2 × 10−5\nI 131 3 × 10−9 2 × 10−5\nI 132 8 × 10−8 6 × 10−4\nI 133 1 × 10−8 7 × 10−5\nI 134 2 × 10−7 1 × 10−3\nIridium (77) Ir 190 2 × 10−3\nIr 192 4 × 10−4\nIr 194 3 × 10−4\nIron (26) Fe 55 8 × 10−3\nFe 59 6 × 10−4\nKrypton (36) Kr 85m 1 × 10−6\nKr 85 3 × 10−6\nLanthanum (57) La 140 2 × 10−4\nLead (82) Pb 203 4 × 10−3\nLutetium (71) Lu 177 1 × 10−3\nManganese (25) Mn 52 3 × 10−4\nMn 54 1 × 10−3\nMn 56 1 × 10−3\nMercury (80) Hg 197m 2 × 10−3\nHg 197 3 × 10−3\nHg 203 2 × 10−4\nMolybdenum (42) Mo 99 2 × 10−3\nNeodymium (60) Nd 147 6 × 10−4\nNd 149 3 × 10−3\nNickel (28) Ni 65 1 × 10−3\nNiobium (Columbium) (41) Nb 95 1 × 10−3\nNb 97 9 × 10−3\nOsmium (76) Os 185 7 × 10−4\nOs 191m 3 × 10−2\nOs 191 2 × 10−3\nOs 193 6 × 10−4\nPalladium (46) Pd 103 3 × 10−3\nPd 109 9 × 10−4\nPhosphorus (15) P 32 2 × 10−4\nPlatinum (78) Pt 191 1 × 10−3\nPt 193m 1 × 10−2\nPt 197m 1 × 10−2\nPt 197 1 × 10−3\nPotassium (19) K 42 3 × 10−3\nPraseodymium (59) Pr 142 3 × 10−4\nPr 143 5 × 10−4\nPromethium (61) Pm 147 2 × 10−3\nPm 149 4 × 10−4\nRhenium (75) Re 183 6 × 10−3\nRe 186 9 × 10−4\nRe 188 6 × 10−4\nRhodium (45) Rh 103m 1 × 10−1\nRh 105 1 × 10−3\nRubidium (37) Rb 86 7 × 10−4\nRuthenium (44) Ru 97 4 × 10−4\nRu 103 8 × 10−4\nRu 105 1 × 10−3\nRu 106 1 × 10−4\nSamarium (62) Sm 153 8 × 10−4\nScandium (21) Sc 46 4 × 10−4\nSc 47 9 × 10−4\nSc 48 3 × 10−4\nSelenium (34) Se 75 3 × 10−3\nSilicon (14) Si 31 9 × 10−3\nSilver (47) Ag 105 1 × 10−3\nAg 110m 3 × 10−4\nAg 111 4 × 10−4\nSodium (11) Na 24 2 × 10−3\nStrontium (38) Sr 85 1 × 10−4\nSr 89 1 × 10−4\nSr 91 7 × 10−4\nSr 92 7 × 10−4\nSulfur (16) S 35 9 × 10−8 6 × 10−4\nTantalum (73) Ta 182 4 × 10−4\nTechnetium (43) Tc 96m 1 × 10−1\nTc 96 1 × 10−3\nTellurium (52) Te 125m 2 × 10−3\nTe 127m 6 × 10−4\nTe 127 3 × 10−3\nTe 129m 3 × 10−4\nTe 131m 6 × 10−4\nTe 132 3 × 10−4\nTerbium (65) Tb 160 4 × 10−4\nThallium (81) Tl 200 4 × 10−3\nTl 201 3 × 10−3\nTl 202 1 × 10−3\nTl 204 1 × 10−3\nThulium (69) Tm 170 5 × 10−4\nTm 171 5 × 10−3\nTin (50) Sn 113 9 × 10−4\nSn 125 2 × 10−4\nTungsten (Wolfram) (74) W 181 4 × 10−3\nW 187 7 × 10−4\nVanadium (23) V 48 3 × 10−4\nXenon (54) Xe 131m 4 × 10−6\nXe 133 3 × 10−6\nXe 135 1 × 10−6\nYtterbium (70) Yb 175 1 × 10−3\nYttrium (39) Y 90 2 × 10−4\nY 91m 3 × 10−2\nY 91 3 × 10−4\nY 92 6 × 10−4\nY 93 3 × 10−4\nZinc (30) Zn 65 1 × 10−3\nZn 69m 7 × 10−4\nZn 69 2 × 10−2\nZirconium (40) Zr 95 6 × 10−4\nZr 97 2 × 10−4\nBeta and/or gamma emitting byproduct material not listed above with half-life less than 3 years 1 × 10−10 1 × 10−6\nFootnotes to Schedule A:\n1 Values are given only for those materials normally used as gases.\n2 µCi/gm for solids.\nNote 1: Many radioisotopes disintegrate into isotopes which are also radioactive. In expressing the concentrations in Schedule A, the activity stated is that of the parent isotope and takes into account the daughters.\nNote 2: For purposes of § 30.14 where there is involved a combination of isotopes, the limit for the combination should be derived as follows:\nDetermine for each isotope in the product the ratio between the concentration present in the product and the exempt concentration established in Schedule A for the specific isotope when not in combination. The sum of such ratios may not exceed “1” (i.e., unity).\nExample:","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":"6741763bc7a1dc984b72172d133b76f0b831e878a2814a91ef1b5511ef52826e","source_id":"us-cfr","stale":true,"prev":"us/10-cfr-30.64","next":"us/10-cfr-30.71"},"notice":"GroundRules: Original legal text. Not legal advice."}