Sch. Sch. 1 1 Fm-254 1 × 104 1 × 107 Fm-255 1 × 103 1 × 106 Alpha-emitting radionuclide 1 × 100 1 × 103 not mentioned in this Table Radionuclide that is not 1 × 101 1 × 104 alpha-emitting and not mentioned in this Table a The levels given in this Schedule for the following radionuclides are for the parent radionuclides, which are assumed to be in secular equilibrium with the progeny listed below— Parent Progeny Sr-80 Rb-80 Sr-90 Y-90 Zr-93 Nb-93m Zr-97 Nb-97 Ru-106 Rh-106 Ag-108m Ag-108 Cs-137 Ba-137m Ce-134 La-134 Ce-144 Pr-144 Ba-140 La-140 Parent Progeny Bi-212 TI-208 (036), Po-212 (064) Bi-212 TI-208 (036), Po-212 (064) Pb-210 Bi-210, Po-210 Pb-212 Bi-212, TI-208 (036), Po-212 (064) Rn-220 Po-216 Rn-222 Po-218, Pb-214, Bi-214, Po-214 Ra-223 Rn-219, Po-215, Pb-211, Bi-211, TI-207 Ra-224 Rn-220, Po-216, Pb-12, Bi-212,
Fm-254 1 × 104 1 × 107 Fm-255 1 × 103 1 × 106 Alpha-emitting radionuclide not mentioned in this Table 1 × 100 1 × 103 Radionuclide that is not alpha-emitting and not mentioned in this Table 1 × 101 1 × 104 a The levels given in this Schedule for the following radionuclides are for the parent radionuclides, which are assumed to be in secular equilibrium with the progeny listed below— Sch. 1 Parent Progeny Sr-80 Rb-80 Sr-90 Y-90 Zr-93 Nb-93m Zr-97 Nb-97 Ru-106 Rh-106 Ag-108m Ag-108 Cs-137 Ba-137m Ce-134 La-134 Ce-144 Pr-144 Ba-140 La-140 Parent Progeny Bi-212 TI-208 (036), Po-212 (064) Bi-212 TI-208 (036), Po-212 (064) Pb-210 Bi-210, Po-210 Pb-212 Bi-212, TI-208 (036), Po-212 (064) Rn-220 Po-216 Rn-222 Po-218, Pb-214, Bi-214, Po-214 Ra-223 Rn-219, Po-215, Pb-211, Bi-211, TI-207 Sch. 1 Ra-224 Rn-220, Po-216, Pb-12, Bi-212,
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