Exempt Liquid and Solid Concentrations, Exempt Quantities

(Tables 1 and 2 of OAR 345 Division 50. See notes at the end of this table.)

Element ↑ ↓	Atomic Number ↑ ↓	Chemical Symbol ↑ ↓	Isotope ↑ ↓	Concentration* (See Table 1) ↑ ↓	Quantity (See Table 2) ↑ ↓
Aluminum	13	Al	Al-26	400 pCi
Americium	95	Am	Am-241	0.8 pCi
Antimony	51	Sb	Sb-122	300 pCi	1e8 pCi
Antimony	51	Sb	Sb-124	200 pCi	1e7 pCi
Antimony	51	Sb	Sb-125	1000 pCi	1e7 pCi
Antimony	51	Sb	Sb-126	600 pCi
Arsenic	33	As	As-73	5000 pCi	1e8 pCi
Arsenic	33	As	As-74	500 pCi	1e7 pCi
Arsenic	33	As	As-76	200 pCi	1e7 pCi
Arsenic	33	As	As-77	800 pCi	1e8 pCi
Barium	56	Ba	Ba-131	2000 pCi	1e7 pCi
Barium	56	Ba	Ba-140	300 pCi	1e7 pCi
Barium	56	Ba	Ba-133	2000 pCi	1e7 pCi
Beryllium	4	Be	Be-7	2e4 pCi
Bismuth	83	Bi	Bi-206	400 pCi
Bismuth	83	Bi	Bi-210		1e6 pCi
Bromine	35	Br	Br-82	3000 pCi	1e7 pCi
Cadmium	48	Cd	Cd-109	2000 pCi	1e7 pCi
Cadmium	48	Cd	Cd-115m	300 pCi	1e7 pCi
Cadmium	48	Cd	Cd-115	300 pCi	1e8 pCi
Calcium	20	Ca	Ca-45	90 pCi	1e7 pCi
Calcium	20	Ca	Ca-47	500 pCi	1e7 pCi
Calcium	20	Ca	Ca-41	3000 pCi
Carbon	6	C	C-14	8000 pCi	1e8 pCi
Cerium	58	Ce	Ce-141	900 pCi	1e8 pCi
Cerium	58	Ce	Ce-143	400 pCi	1e8 pCi
Cerium	58	Ce	Ce-144	100 pCi	1e6 pCi
Cesium	55	Cs	Cs-131	2e4 pCi	1e6 pCi
Cesium	55	Cs	Cs-134m	6e4 pCi	1e8 pCi
Cesium	55	Cs	Cs-134	90 pCi	1e6 pCi
Cesium	55	Cs	Cs-135		1e7 pCi
Cesium	55	Cs	Cs-136		1e7 pCi
Cesium	55	Cs	Cs-137	100 pCi	1e7 pCi
Cesium	55	Cs	Cs-129		1e8 pCi
Chlorine	17	Cl	Cl-36	2000 pCi	1e7 pCi
Chlorine	17	Cl	Cl-38	4000 pCi	1e7 pCi
Chromium	24	Cr	Cr-51	2e4 pCi	1e6 pCi
Cobalt	27	Co	Co-57	5000 pCi	1e8 pCi
Cobalt	27	Co	Co-58m		1e7 pCi
Cobalt	27	Co	Co-58	1000 pCi	1e7 pCi
Cobalt	27	Co	Co-60	500 pCi	1e6 pCi
Copper	29	Cu	Cu-64	3000 pCi	1e8 pCi
Curium	96	Cm	Cm-242	30 pCi
Curium	96	Cm	Cm-243	1 pCi
Curium	96	Cm	Cm-244	1 pCi
Dysprosium	66	Dy	Dy-165	4000 pCi	1e7 pCi
Dysprosium	66	Dy	Dy-166	400 pCi	1e8 pCi
Erbium	68	Er	Er-169	900 pCi	1e8 pCi
Erbium	68	Er	Er-171	1000 pCi	1e8 pCi
Europium	63	Eu	Eu-152 (9.2 hrs)	600 pCi	1e8 pCi
Europium	63	Eu	Eu-152 (13 yrs)	800 pCi	1e6 pCi
Europium	63	Eu	Eu-154	500 pCi	1e6 pCi
Europium	63	Eu	Eu-155	2000 pCi	1e7 pCi
Fluorine	9	F	F-18	8000 pCi	1e9 pCi
Gadolinium	64	Gd	Gd-153	2000 pCi	1e7 pCi
Gadolinium	64	Gd	Gd-159	800 pCi	1e8 pCi
Gallium	31	Ga	Ga-72	400 pCi	1e7 pCi
Gallium	31	Ga	Ga-67	7000 pCi	1e8 pCi
Germanium	32	Ge	Ge-71	2e4 pCi	1e8 pCi
Germanium	32	Ge	Ge-68		1e7 pCi
Gold	79	Au	Au-196	2000 pCi
Gold	79	Au	Au-198	500 pCi	1e8 pCi
Gold	79	Au	Au-199	2000 pCi	1e8 pCi
Gold	79	Au	Au-195	5000 pCi	1e7 pCi
Hafnium	72	Hf	Hf-181	700 pCi	1e7 pCi
Holmium	67	Ho	Ho-166		1e8 pCi
Hydrogen	1	H	H-3	3e4 pCi	1e9 pCi
Indium	49	In	In-113m	1e4 pCi	1e8 pCi
Indium	49	In	In-114m	200 pCi	1e7 pCi
Indium	49	In	In-115m		1e8 pCi
Indium	49	In	In-115		1e7 pCi
Indium	49	In	In-111	8e4 pCi	1e8 pCi
Iodine	53	I	I-125	20 pCi	1e6 pCi
Iodine	53	I	I-126	20 pCi	1e6 pCi
Iodine	53	I	I-129	5 pCi	1e5 pCi
Iodine	53	I	I-131	20 pCi	1e6 pCi
Iodine	53	I	I-132	600 pCi	1e7 pCi
Iodine	53	I	I-133	70 pCi	1e6 pCi
Iodine	53	I	I-134	1000 pCi	1e7 pCi
Iodine	53	I	I-135		1e7 pCi
Iodine	53	I	I-123		1e8 pCi
Iridium	77	Ir	Ir-190	2000 pCi
Iridium	77	Ir	Ir-192	400 pCi	1e7 pCi
Iridium	77	Ir	Ir-194	300 pCi	1e8 pCi
Iron	26	Fe	Fe-55	8000 pCi	1e8 pCi
Iron	26	Fe	Fe-59	600 pCi	1e7 pCi
Iron	26	Fe	Fe-52		1e7 pCi
Krypton	36	Kr	Kr-85		1e8 pCi
Krypton	36	Kr	Kr-87		1e7 pCi
Lanthanum	57	La	La-140	200 pCi	1e7 pCi
Lead	82	Pb	Pb-203	4000 pCi
Lead	82	Pb	Pb-210	10 pCi
Lutetium	71	Lu	Lu-177	1000 pCi	1e8 pCi
Manganese	25	Mn	Mn-52	300 pCi	1e7 pCi
Manganese	25	Mn	Mn-54	1000 pCi	1e7 pCi
Manganese	25	Mn	Mn-56	1000 pCi	1e7 pCi
Mercury	80	Hg	Hg-197m	2000 pCi	1e8 pCi
Mercury	80	Hg	Hg-197	3000 pCi	1e8 pCi
Mercury	80	Hg	Hg-203	200 pCi	1e7 pCi
Molybdenum	42	Mo	Mo-99	2000 pCi	1e8 pCi
Neodymium	60	Nd	Nd-147	600 pCi	1e8 pCi
Neodymium	60	Nd	Nd-149	3000 pCi	1e8 pCi
Nickel	28	Ni	Ni-59	2e4 pCi	1e8 pCi
Nickel	28	Ni	Ni-63	9000 pCi	1e7 pCi
Nickel	28	Ni	Ni-65	1000 pCi	1e8 pCi
Niobium	41	Nb	Nb-93m		1e7 pCi
Niobium	41	Nb	Nb-95	1000 pCi	1e7 pCi
Niobium	41	Nb	Nb-97	9000 pCi	1e7 pCi
Niobium	41	Nb	Nb-94	900 pCi
Osmium	76	Os	Os-185	700 pCi	1e7 pCi
Osmium	76	Os	Os-191m	3e4 pCi	1e8 pCi
Osmium	76	Os	Os-191	2000 pCi	1e8 pCi
Osmium	76	Os	Os-193	600 pCi	1e8 pCi
Palladium	46	Pd	Pd-103	3000 pCi	1e8 pCi
Palladium	46	Pd	Pd-109	900 pCi	1e8 pCi
Phosphorus	15	P	P-32	200 pCi	1e7 pCi
Phosphorus	15	P	P-33	6000 pCi
Platinum	78	Pt	Pt-191	1000 pCi	1e8 pCi
Platinum	78	Pt	Pt-193m	1e4 pCi	1e8 pCi
Platinum	78	Pt	Pt-193		1e8 pCi
Platinum	78	Pt	Pt-197m	1e4 pCi	1e8 pCi
Platinum	78	Pt	Pt-197	1000 pCi	1e8 pCi
Plutonium	94	Pu	Pu-238	0.9 pCi
Plutonium	94	Pu	Pu-239	0.8 pCi
Plutonium	94	Pu	Pu-240	0.8 pCi
Plutonium	94	Pu	Pu-241	40 pCi
Plutonium	94	Pu	Pu-242	0.8 pCi
Polonium	84	Po	Po-210		1e5 pCi
Potassium	19	K	K-42	3000 pCi	1e7 pCi
Potassium	19	K	K-43		1e7 pCi
Praseodymium	59	Pr	Pr-142	300 pCi	1e8 pCi
Praseodymium	59	Pr	Pr-143	500 pCi	1e8 pCi
Promethium	61	Pm	Pm-147	2000 pCi	1e7 pCi
Promethium	61	Pm	Pm-149	400 pCi	1e7 pCi
Radium	88	Ra	Ra-226	5 pCi	1e7 pCi
Radium	88	Ra	Ra-228	20 pCi	1e8 pCi
Rhenium	75	Re	Re-183	6000 pCi
Rhenium	75	Re	Re-186	900 pCi	1e8 pCi
Rhenium	75	Re	Re-188	600 pCi	1e8 pCi
Rhodium	45	Rh	Rh-103m	1e5 pCi	1e8 pCi
Rhodium	45	Rh	Rh-105	1000 pCi	1e8 pCi
Rubidium	37	Rb	Rb-86	700 pCi	1e7 pCi
Rubidium	37	Rb	Rb-87		1e7 pCi
Rubidium	37	Rb	Rb-81		1e7 pCi
Ruthenium	44	Ru	Ru-97	4000 pCi
Ruthenium	44	Ru	Ru-103	800 pCi	1e7 pCi
Ruthenium	44	Ru	Ru-105	1000 pCi	1e7 pCi
Ruthenium	44	Ru	Ru-106	100 pCi	1e6 pCi
Samarium	62	Sm	Sm-151		1e7 pCi
Samarium	62	Sm	Sm-153	800 pCi	1e8 pCi
Scandium	21	Sc	Sc-46	400 pCi	1e7 pCi
Scandium	21	Sc	Sc-47	900 pCi	1e8 pCi
Scandium	21	Sc	Sc-48	300 pCi	1e7 pCi
Selenium	34	Se	Se-75	3000 pCi	1e7 pCi
Silicon	14	Si	Si-31	9000 pCi	1e8 pCi
Silver	47	Ag	Ag-105	1000 pCi	1e7 pCi
Silver	47	Ag	Ag-110m	300 pCi	1e6 pCi
Silver	47	Ag	Ag-111	400 pCi	1e8 pCi
Silver	47	Ag	Ag-108m	600 pCi
Sodium	11	Na	Na-22	400 pCi	1e7 pCi
Sodium	11	Na	Na-24	2000 pCi	1e7 pCi
Strontium	38	Sr	Sr-85	1000 pCi	1e7 pCi
Strontium	38	Sr	Sr-89	100 pCi	1e6 pCi
Strontium	38	Sr	Sr-90	30 pCi	1e5 pCi
Strontium	38	Sr	Sr-91	700 pCi	1e7 pCi
Strontium	38	Sr	Sr-92	700 pCi	1e7 pCi
Sulfur	16	S	S-35	600 pCi	1e8 pCi
Tantalum	73	Ta	Ta-182	400 pCi	1e7 pCi
Technetium	43	Tc	Tc-96m	1e5 pCi
Technetium	43	Tc	Tc-96	1000 pCi	1e7 pCi
Technetium	43	Tc	Tc-97m		1e8 pCi
Technetium	43	Tc	Tc-97		1e8 pCi
Technetium	43	Tc	Tc-99m	8e4 pCi	1e8 pCi
Technetium	43	Tc	Tc-99	4000 pCi	1e7 pCi
Tellurium	52	Te	Te-125m	2000 pCi	1e7 pCi
Tellurium	52	Te	Te-127m	600 pCi	1e7 pCi
Tellurium	52	Te	Te-127	3000 pCi	1e8 pCi
Tellurium	52	Te	Te-129m	300 pCi	1e7 pCi
Tellurium	52	Te	Te-129		1e8 pCi
Tellurium	52	Te	Te-131m	600 pCi	1e7 pCi
Tellurium	52	Te	Te-132	300 pCi	1e7 pCi
Terbium	65	Tb	Tb-160	400 pCi	1e7 pCi
Thallium	81	Tl	Tl-200	4000 pCi	1e8 pCi
Thallium	81	Tl	Tl-201	3000 pCi	1e8 pCi
Thallium	81	Tl	Tl-202	1000 pCi	1e8 pCi
Thallium	81	Tl	Tl-204	1000 pCi	1e7 pCi
Thulium	69	Tm	Tm-170	500 pCi	1e7 pCi
Thulium	69	Tm	Tm-171	5000 pCi	1e7 pCi
Tin	50	Sn	Sn-113	900 pCi	1e7 pCi
Tin	50	Sn	Sn-125	200 pCi	1e7 pCi
Tungsten	74	W	W-181	4000 pCi	1e7 pCi
Tungsten	74	W	W-185		1e7 pCi
Tungsten	74	W	W-187	700 pCi	1e8 pCi
Uranium	92	U	U-233	10 pCi
Uranium	92	U	U-234	10 pCi
Uranium	92	U	U-235	10 pCi
Uranium	92	U	U-236	10 pCi
Uranium	92	U	U-238	10 pCi
Vanadium	23	V	V-48	300 pCi	1e7 pCi
Xenon	54	Xe	Xe-131m		1e9 pCi
Xenon	54	Xe	Xe-133		1e8 pCi
Xenon	54	Xe	Xe-135		1e8 pCi
Ytterbium	70	Yb	Yb-175	1000 pCi	1e8 pCi
Yttrium	39	Y	Y-90	200 pCi	1e7 pCi
Yttrium	39	Y	Y-91m	3e4 pCi
Yttrium	39	Y	Y-91	300 pCi	1e7 pCi
Yttrium	39	Y	Y-92	600 pCi	1e8 pCi
Yttrium	39	Y	Y-93	300 pCi	1e8 pCi
Yttrium	39	Y	Y-87		1e7 pCi
Yttrium	39	Y	Y-88		1e7 pCi
Zinc	30	Zn	Zn-65	1000 pCi	1e7 pCi
Zinc	30	Zn	Zn-69m	700 pCi	1e8 pCi
Zinc	30	Zn	Zn-69	2e4 pCi	1e9 pCi
Zirconium	40	Zr	Zr-93		1e7 pCi
Zirconium	40	Zr	Zr-95	600 pCi	1e7 pCi
Zirconium	40	Zr	Zr-97	200 pCi	1e7 pCi
Beta- and/or gamma-emitting radioactive material not listed above with half-life of less than 3 years.				1 pCi
Beta- and/or gamma-emitting radioactive material other than naturally occurring radioactive material not listed above with half-life of equal to or more than 3 years.				0.5 pCi
Alpha-emitting radioactive material other than naturally occurring radioactive material not listed above with a half-life of less than 3 years.				0.3 pCi
Alpha-emitting radioactive material other than naturally occurring radioactive material not listed above with a half-life of equal to or more than 3 years.				0.1 pCi
Any radioactive material not listed above other than alpha-emitting radioactive material.					1e5 pCi
Any alpha-emitting radioactive material other than naturally occurring radioactive material not listed above.					5e4 pCi

Note 1:

Many radioisotopes transform into isotopes that are also radioactive. In expressing the concentrations in Column 5 ("Concentration") of Table 1, the activity stated is that of the parent isotope and takes into account the daughters.

Note 2:

For purposes of OAR 345-050-0025, where a combination of isotopes is involved, the limit for the combination should be derived as follows:

Determine for each isotope in the product the ratio between the radioactivity concentration present in the product and the exempt radioactivity concentration established in Column 5 ("Concentration") of Table 1 for the specific isotope when not in combination.

The sum of such ratios must not exceed "1".

Example:

Concentration of Isotope A in Product Exempt Concentration of Isotope A

Concentration of Isotope B in Product Exempt Concentration of Isotope B

≤

Note 3:

Not included in division 50 tables - see OAR 345-050-0020 (2) and -0025 (2).

Note 4:

When Th-232 is present - Not included in division 50 tables - see OAR 345-050-0020 (3) and -0025 (3).

Note 5:

When certain wastes are out of equilibrium with U-238 - Not included in division 50 tables - see OAR 345-050-0020 (4).

Exempt Concentrations in Air and Water Above Natural Background

(Table 3 of OAR 345 Division 50. See notes at the end of this table.)

				Air			Water
Element ↑ ↓	Atomic Number ↑ ↓	Chemical Symbol ↑ ↓	Isotope ↑ ↓	Soluble (qty/ml) ↑ ↓	Insoluble (qty/ml) ↑ ↓	Submersion* (qty/ml) ↑ ↓	Soluble (qty/ml) ↑ ↓	Insoluble (qty/ml) ↑ ↓
Actinium	89	Ac	Ac-227	8e-8 pCi	9e-7 pCi		2 pCi	300 pCi
Actinium	89	Ac	Ac-228	0.003 pCi	6e-4 pCi		90 pCi	90 pCi
Americium	95	Am	Am-241	2e-7 pCi	4e-6 pCi		4 pCi	30 pCi
Americium	95	Am	Am-242m	2e-7 pCi	9e-6 pCi		4 pCi	90 pCi
Americium	95	Am	Am-242	0.001 pCi	0.002 pCi		100 pCi	100 pCi
Americium	95	Am	Am-243	2e-7 pCi	4e-6 pCi		4 pCi	30 pCi
Americium	95	Am	Am-244	0.1 pCi	0.8 pCi		5000 pCi	5000 pCi
Antimony	51	Sb	Sb-122	0.006 pCi	0.005 pCi		30 pCi	30 pCi
Antimony	51	Sb	Sb-124	0.005 pCi	7e-4 pCi		20 pCi	20 pCi
Antimony	51	Sb	Sb-125	0.02 pCi	9e-4 pCi		100 pCi	100 pCi
Argon	18	Ar	Ar-37			100 pCi
Argon	18	Ar	Ar-41			0.04 pCi
Arsenic	33	As	As-73	0.07 pCi	0.01 pCi		500 pCi	500 pCi
Arsenic	33	As	As-74	0.01 pCi	0.004 pCi		50 pCi	50 pCi
Arsenic	33	As	As-76	0.004 pCi	0.003 pCi		20 pCi	20 pCi
Arsenic	33	As	As-77	0.02 pCi	0.01 pCi		80 pCi	80 pCi
Astatine	85	At	At-211	2e-4 pCi	0.001 pCi		2 pCi	70 pCi
Barium	56	Ba	Ba-131	0.04 pCi	0.01 pCi		200 pCi	200 pCi
Barium	56	Ba	Ba-140	0.004 pCi	0.001 pCi		30 pCi	20 pCi
Berkelium	97	Bk	Bk-249	3e-5 pCi	0.004 pCi		600 pCi	600 pCi
Berkelium	97	Bk	Bk-250	0.005 pCi	0.04 pCi		200 pCi	200 pCi
Beryllium	4	Be	Be-7	0.2 pCi	0.04 pCi		2000 pCi	2000 pCi
Bismuth	83	Bi	Bi-206	0.006 pCi	0.005 pCi		40 pCi	40 pCi
Bismuth	83	Bi	Bi-207	0.006 pCi	5e-4 pCi		60 pCi	60 pCi
Bismuth	83	Bi	Bi-210	2e-4 pCi	2e-4 pCi		40 pCi	40 pCi
Bismuth	83	Bi	Bi-212	0.003 pCi	0.007 pCi		400 pCi	400 pCi
Bromine	35	Br	Br-82	0.04 pCi	0.006 pCi		300 pCi	40 pCi
Cadmium	48	Cd	Cd-109	0.002 pCi	0.003 pCi		200 pCi	200 pCi
Cadmium	48	Cd	Cd-115m	0.001 pCi	0.001 pCi		30 pCi	30 pCi
Cadmium	48	Cd	Cd-115	0.008 pCi	0.006 pCi		30 pCi	40 pCi
Calcium	20	Ca	Ca-45	0.001 pCi	0.004 pCi		9 pCi	200 pCi
Calcium	20	Ca	Ca-47	0.006 pCi	0.006 pCi		50 pCi	30 pCi
Californium	98	Cf	Cf-249	5e-8 pCi	3e-6 pCi		4 pCi	20 pCi
Californium	98	Cf	Cf-250	2e-7 pCi	3e-6 pCi		10 pCi	30 pCi
Californium	98	Cf	Cf-251	6e-8 pCi	3e-6 pCi		4 pCi	30 pCi
Californium	98	Cf	Cf-252	2e-7 pCi	1e-6 pCi		7 pCi	7 pCi
Californium	98	Cf	Cf-253	3e-5 pCi	3e-5 pCi		100 pCi	100 pCi
Californium	98	Cf	Cf-254	2e-7 pCi	2e-7 pCi		0.1 pCi	0.1 pCi
Carbon	6	C	C-14	0.1 pCi			800 pCi
Carbon	6	C	CO2			1 pCi
Cerium	58	Ce	Ce-141	0.02 pCi	0.005 pCi		90 pCi	90 pCi
Cerium	58	Ce	Ce-143	0.009 pCi	0.007 pCi		40 pCi	40 pCi
Cerium	58	Ce	Ce-144	3e-4 pCi	2e-4 pCi		10 pCi	10 pCi
Cesium	55	Cs	Cs-131	0.4 pCi	0.1 pCi		2000 pCi	900 pCi
Cesium	55	Cs	Cs-134m	1 pCi	0.2 pCi		6000 pCi	1000 pCi
Cesium	55	Cs	Cs-134	0.001 pCi	4e-4 pCi		9 pCi	40 pCi
Cesium	55	Cs	Cs-135	0.02 pCi	0.003 pCi		100 pCi	200 pCi
Cesium	55	Cs	Cs-136	0.01 pCi	0.006 pCi		90 pCi	60 pCi
Cesium	55	Cs	Cs-137	0.002 pCi	5e-4 pCi		20 pCi	40 pCi
Chlorine	17	Cl	Cl-36	0.01 pCi	8e-4 pCi		80 pCi	60 pCi
Chlorine	17	Cl	Cl-38	0.09 pCi	0.07 pCi		400 pCi	400 pCi
Chromium	24	Cr	Cr-51	0.4 pCi	0.08 pCi		2000 pCi	2000 pCi
Cobalt	27	Co	Co-57	0.1 pCi	0.006 pCi		500 pCi	400 pCi
Cobalt	27	Co	Co-58m	0.6 pCi	0.3 pCi		3000 pCi	2000 pCi
Cobalt	27	Co	Co-58	0.03 pCi	0.002 pCi		100 pCi	90 pCi
Cobalt	27	Co	Co-60	0.01 pCi	3e-4 pCi		50 pCi	30 pCi
Copper	29	Cu	Cu-64	0.07 pCi	0.04 pCi		300 pCi	200 pCi
Curium	96	Cm	Cm-242	4e-6 pCi	6e-6 pCi		20 pCi	20 pCi
Curium	96	Cm	Cm-243	2e-7 pCi	3e-6 pCi		5 pCi	20 pCi
Curium	96	Cm	Cm-244	3e-7 pCi	3e-6 pCi		7 pCi	30 pCi
Curium	96	Cm	Cm-245	2e-7 pCi	4e-6 pCi		4 pCi	30 pCi
Curium	96	Cm	Cm-246	2e-7 pCi	4e-6 pCi		4 pCi	30 pCi
Curium	96	Cm	Cm-247	2e-7 pCi	4e-6 pCi		4 pCi	20 pCi
Curium	96	Cm	Cm-248	2e-8 pCi	4e-7 pCi		0.4 pCi	1 pCi
Curium	96	Cm	Cm-249	0.4 pCi	0.4 pCi		2000 pCi	2000 pCi
Dysprosium	66	Dy	Dy-165	0.09 pCi	0.07 pCi		400 pCi	400 pCi
Dysprosium	66	Dy	Dy-166	0.008 pCi	0.007 pCi		40 pCi	40 pCi
Einsteinium	99	Es	Es-253	3e-5 pCi	2e-5 pCi		20 pCi	20 pCi
Einsteinium	99	Es	Es-254m	2e-4 pCi	2e-4 pCi		20 pCi	20 pCi
Einsteinium	99	Es	Es-254	6e-7 pCi	4e-6 pCi		10 pCi	10 pCi
Einsteinium	99	Es	Es-255	2e-5 pCi	1e-5 pCi		30 pCi	30 pCi
Erbium	68	Er	Er-169	0.02 pCi	0.01 pCi		90 pCi	90 pCi
Erbium	68	Er	Er-171	0.02 pCi	0.02 pCi		100 pCi	100 pCi
Europium	63	Eu	Eu-152 (a)	0.01 pCi			60 pCi
Europium	63	Eu	Eu-152 (9.2 hrs)	0.01 pCi	0.01 pCi	0.01 pCi	60 pCi	60 pCi
Europium	63	Eu	Eu-152 (b)	4e-4 pCi			80 pCi
Europium	63	Eu	Eu-152 (13 yrs)	6e-4 pCi	6e-4 pCi	6e-4 pCi	80 pCi	80 pCi
Europium	63	Eu	Eu-154	1e-4 pCi	2e-4 pCi		20 pCi	20 pCi
Europium	63	Eu	Eu-155	0.003 pCi	0.003 pCi		200 pCi	200 pCi
Fermium	100	Fm	Fm-254	0.002 pCi	0.002 pCi		100 pCi	100 pCi
Fermium	100	Fm	Fm-255	6e-4 pCi	4e-4 pCi		30 pCi	30 pCi
Fermium	100	Fm	Fm-256	1e-4 pCi	6e-5 pCi		0.9 pCi	0.9 pCi
Fluorine	9	F	F-18	0.2 pCi	0.09 pCi		800 pCi	500 pCi
Gadolinium	64	Gd	Gd-153	0.008 pCi	0.003 pCi		200 pCi	200 pCi
Gadolinium	64	Gd	Gd-159	0.02 pCi	0.01 pCi		80 pCi	80 pCi
Gallium	31	Ga	Ga-72	0.008 pCi	0.006 pCi		40 pCi	40 pCi
Germanium	32	Ge	Ge-71	0.4 pCi	0.2 pCi		2000 pCi	2000 pCi
Gold	79	Au	Au-196	0.04 pCi	0.02 pCi		200 pCi	100 pCi
Gold	79	Au	Au-198	0.01 pCi	0.008 pCi		50 pCi	50 pCi
Gold	79	Au	Au-199	0.04 pCi	0.03 pCi		200 pCi	200 pCi
Hafnium	72	Hf	Hf-181	0.001 pCi	0.003 pCi		70 pCi	70 pCi
Holmium	67	Ho	Ho-166	0.007 pCi	0.006 pCi		30 pCi	30 pCi
Hydrogen	1	H	H-3	0.2 pCi	0.2 pCi	40 pCi	3000 pCi	3000 pCi
Indium	49	In	In-113m	0.3 pCi	0.2 pCi		1000 pCi	1000 pCi
Indium	49	In	In-114m	0.004 pCi	7e-4 pCi		20 pCi	20 pCi
Indium	49	In	In-115m	0.08 pCi	0.06 pCi		400 pCi	400 pCi
Indium	49	In	In-115	0.009 pCi	0.001 pCi		90 pCi	90 pCi
Iodine	53	I	I-125	8e-5 pCi	0.006 pCi		0.2 pCi	200 pCi
Iodine	53	I	I-126	9e-5 pCi	0.01 pCi		0.3 pCi	90 pCi
Iodine	53	I	I-129	2e-5 pCi	0.002 pCi		0.06 pCi	200 pCi
Iodine	53	I	I-131	1e-4 pCi	0.01 pCi		0.3 pCi	60 pCi
Iodine	53	I	I-132	0.003 pCi	0.03 pCi		8 pCi	200 pCi
Iodine	53	I	I-133	4e-4 pCi	0.007 pCi		1 pCi	40 pCi
Iodine	53	I	I-134	0.006 pCi	0.1 pCi		20 pCi	600 pCi
Iodine	53	I	I-135	0.001 pCi	0.01 pCi		4 pCi	70 pCi
Iridium	77	Ir	Ir-190	0.04 pCi	0.01 pCi		200 pCi	200 pCi
Iridium	77	Ir	Ir-192	0.004 pCi	9e-4 pCi		40 pCi	40 pCi
Iridium	77	Ir	Ir-194	0.008 pCi	0.005 pCi		30 pCi	30 pCi
Iron	26	Fe	Fe-55	0.03 pCi	0.03 pCi		800 pCi	2000 pCi
Iron	26	Fe	Fe-59	0.005 pCi	0.002 pCi		60 pCi	50 pCi
Krypton	36	Kr	Kr-85m			0.1 pCi
Krypton	36	Kr	Kr-85			0.3 pCi
Krypton	36	Kr	Kr-87			0.02 pCi
Krypton	36	Kr	Kr-88			0.02 pCi
Lanthanum	57	La	La-140	0.005 pCi	0.004 pCi		20 pCi	20 pCi
Lead	82	Pb	Pb-203	0.09 pCi	0.06 pCi		400 pCi	400 pCi
Lead	82	Pb	Pb-210	4e-6 pCi	8e-6 pCi		0.1 pCi	200 pCi
Lead	82	Pb	Pb-212	6e-4 pCi	7e-4 pCi		20 pCi	20 pCi
Lutetium	71	Lu	Lu-177	0.02 pCi	0.02 pCi		100 pCi	100 pCi
Manganese	25	Mn	Mn-52	0.007 pCi	0.005 pCi		30 pCi	30 pCi
Manganese	25	Mn	Mn-54	0.01 pCi	0.001 pCi		100 pCi	100 pCi
Manganese	25	Mn	Mn-56	0.03 pCi	0.02 pCi		100 pCi	100 pCi
Mercury	80	Hg	Hg-197m	0.03 pCi	0.03 pCi		200 pCi	200 pCi
Mercury	80	Hg	Hg-197	0.04 pCi	0.09 pCi		300 pCi	500 pCi
Mercury	80	Hg	Hg-203	0.002 pCi	0.004 pCi		20 pCi	100 pCi
Molybdenum	42	Mo	Mo-99	0.03 pCi	0.007 pCi		200 pCi	40 pCi
Neodymium	60	Nd	Nd-144	3e-6 pCi	1e-5 pCi		70 pCi	80 pCi
Neodymium	60	Nd	Nd-147	0.01 pCi	0.008 pCi		60 pCi	60 pCi
Neodymium	60	Nd	Nd-149	0.06 pCi	0.05 pCi		300 pCi	300 pCi
Neptunium	93	Np	Np-237	1e-7 pCi	4e-6 pCi		3 pCi	30 pCi
Neptunium	93	Np	Np-239	0.03 pCi	0.02 pCi		100 pCi	100 pCi
Nickel	28	Ni	Ni-59	0.02 pCi	0.03 pCi		200 pCi	2000 pCi
Nickel	28	Ni	Ni-63	0.002 pCi	0.01 pCi		30 pCi	700 pCi
Nickel	28	Ni	Ni-65	0.03 pCi	0.02 pCi		100 pCi	100 pCi
Niobium	41	Nb	Nb-93m	0.004 pCi	0.005 pCi		400 pCi	400 pCi
Niobium	41	Nb	Nb-95	0.02 pCi	0.003 pCi		100 pCi	100 pCi
Niobium	41	Nb	Nb-97	0.2 pCi	0.2 pCi		900 pCi	900 pCi
Osmium	76	Os	Os-185	0.02 pCi	0.002 pCi		70 pCi	70 pCi
Osmium	76	Os	Os-191m	0.6 pCi	0.3 pCi		3000 pCi	2000 pCi
Osmium	76	Os	Os-191	0.04 pCi	0.01 pCi		200 pCi	200 pCi
Osmium	76	Os	Os-193	0.01 pCi	0.009 pCi		60 pCi	50 pCi
Palladium	46	Pd	Pd-103	0.05 pCi	0.03 pCi		300 pCi	300 pCi
Palladium	46	Pd	Pd-109	0.02 pCi	0.01 pCi		90 pCi	70 pCi
Phosphorus	15	P	P-32	0.002 pCi	0.003 pCi		20 pCi	20 pCi
Platinum	78	Pt	Pt-191	0.03 pCi	0.02 pCi		100 pCi	100 pCi
Platinum	78	Pt	Pt-193m	0.2 pCi	0.2 pCi		1000 pCi	1000 pCi
Platinum	78	Pt	Pt-193	0.04 pCi	0.01 pCi		900 pCi	2000 pCi
Platinum	78	Pt	Pt-197m	0.2 pCi	0.2 pCi		1000 pCi	900 pCi
Plutonium	94	Pu	Pu-238	7e-8 pCi	1e-6 pCi		5 pCi	30 pCi
Plutonium	94	Pu	Pu-239	6e-8 pCi	1e-6 pCi		5 pCi	30 pCi
Plutonium	94	Pu	Pu-240	6e-8 pCi	1e-6 pCi		5 pCi	30 pCi
Plutonium	94	Pu	Pu-241	3e-6 pCi	0.001 pCi		200 pCi	1000 pCi
Plutonium	94	Pu	Pu-242	6e-8 pCi	1e-6 pCi		5 pCi	30 pCi
Plutonium	94	Pu	Pu-243	0.06 pCi	0.08 pCi		300 pCi	300 pCi
Plutonium	94	Pu	Pu-244	6e-8 pCi	1e-6 pCi		4 pCi	10 pCi
Polonium	84	Po	Po-210	2e-5 pCi	7e-6 pCi		0.7 pCi	30 pCi
Potassium	19	K	K-42	0.07 pCi	0.004 pCi		300 pCi	20 pCi
Praseodymium	59	Pr	Pr-142	0.007 pCi	0.005 pCi		30 pCi	30 pCi
Praseodymium	59	Pr	Pr-143	0.01 pCi	0.006 pCi		50 pCi	50 pCi
Promethium	61	Pm	Pm-147	0.002 pCi	0.003 pCi		200 pCi	200 pCi
Promethium	61	Pm	Pm-149	0.01 pCi	0.008 pCi		40 pCi	40 pCi
Protactinium	91	Pa	Pa-230	6e-5 pCi	3e-5 pCi		200 pCi	200 pCi
Protactinium	91	Pa	Pa-231	4e-8 pCi	4e-6 pCi		0.9 pCi	20 pCi
Protactinium	91	Pa	Pa-233	0.02 pCi	0.006 pCi		100 pCi	100 pCi
Radium	88	Ra	Ra-223	6e-5 pCi	8e-6 pCi		0.7 pCi	4 pCi
Radium	88	Ra	Ra-224	2e-4 pCi	2e-5 pCi		2 pCi	5 pCi
Radium	88	Ra	Ra-226	3e-6 pCi	2e-6 pCi		0.03 pCi	30 pCi
Radium	88	Ra	Ra-228	2e-6 pCi	1e-6 pCi		0.03 pCi	30 pCi
Radon	86	Rn	Rn-220	0.01 pCi
Radon	86	Rn	Rn-222	0.003 pCi
Rhenium	75	Re	Re-183	0.09 pCi	0.005 pCi		600 pCi	300 pCi
Rhenium	75	Re	Re-186	0.02 pCi	0.008 pCi		90 pCi	50 pCi
Rhenium	75	Re	Re-187	0.3 pCi	0.02 pCi		3000 pCi	2000 pCi
Rhenium	75	Re	Re-188	0.01 pCi	0.006 pCi		60 pCi	30 pCi
Rhodium	45	Rh	Rh-103m	3 pCi	2 pCi		1e4 pCi	1e4 pCi
Rhodium	45	Rh	Rh-105	0.03 pCi	0.02 pCi		100 pCi	100 pCi
Rubidium	37	Rb	Rb-86	0.01 pCi	0.002 pCi		70 pCi	20 pCi
Rubidium	37	Rb	Rb-87	0.02 pCi	0.002 pCi		100 pCi	200 pCi
Ruthenium	44	Ru	Ru-97	0.08 pCi	0.06 pCi		400 pCi	300 pCi
Ruthenium	44	Ru	Ru-103	0.02 pCi	0.003 pCi		80 pCi	80 pCi
Ruthenium	44	Ru	Ru-105	0.02 pCi	0.02 pCi		100 pCi	100 pCi
Ruthenium	44	Ru	Ru-106	0.003 pCi	2e-4 pCi		10 pCi	10 pCi
Samarium	62	Sm	Sm-147	2e-6 pCi	9e-6 pCi		60 pCi	7e-9 pCi
Samarium	62	Sm	Sm-151	0.002 pCi	0.005 pCi		400 pCi	400 pCi
Samarium	62	Sm	Sm-153	0.02 pCi	0.01 pCi		80 pCi	80 pCi
Scandium	21	Sc	Sc-46	0.008 pCi	8e-4 pCi		40 pCi	40 pCi
Scandium	21	Sc	Sc-47	0.02 pCi	0.02 pCi		90 pCi	90 pCi
Scandium	21	Sc	Sc-48	0.006 pCi	0.005 pCi		30 pCi	30 pCi
Selenium	34	Se	Se-75	0.04 pCi	0.004 pCi		300 pCi	300 pCi
Silicon	14	Si	Si-31	0.2 pCi	0.03 pCi		900 pCi	200 pCi
Silver	47	Ag	Ag-105	0.02 pCi	0.003 pCi		100 pCi	100 pCi
Silver	47	Ag	Ag-110m	0.007 pCi	3e-4 pCi		30 pCi	30 pCi
Silver	47	Ag	Ag-111	0.01 pCi	0.008 pCi		40 pCi	40 pCi
Sodium	11	Na	Na-22	0.006 pCi	3e-4 pCi		40 pCi	30 pCi
Sodium	11	Na	Na-24	0.04 pCi	0.005 pCi		200 pCi	30 pCi
Strontium	38	Sr	Sr-85m	1 pCi	1 pCi		7000 pCi	7000 pCi
Strontium	38	Sr	Sr-85	0.008 pCi	0.004 pCi		100 pCi	200 pCi
Strontium	38	Sr	Sr-89	3e-4 pCi	0.001 pCi		3 pCi	30 pCi
Strontium	38	Sr	Sr-90	3e-5 pCi	2e-4 pCi		0.3 pCi	40 pCi
Strontium	38	Sr	Sr-91	0.02 pCi	0.009 pCi		70 pCi	50 pCi
Strontium	38	Sr	Sr-92	0.02 pCi	0.01 pCi		70 pCi	60 pCi
Sulfur	16	S	S-35	0.009 pCi	0.009 pCi		60 pCi	300 pCi
Tantalum	73	Ta	Ta-182	0.001 pCi	7e-4 pCi		40 pCi	40 pCi
Technetium	43	Tc	Tc-96m	3 pCi	1 pCi		1e4 pCi	1e4 pCi
Technetium	43	Tc	Tc-96	0.02 pCi	0.008 pCi		100 pCi	50 pCi
Technetium	43	Tc	Tc-97m	0.08 pCi	0.005 pCi		400 pCi	200 pCi
Technetium	43	Tc	Tc-97	0.4 pCi	0.01 pCi		2000 pCi	800 pCi
Technetium	43	Tc	Tc-99m	1 pCi	0.5 pCi		6000 pCi	3000 pCi
Technetium	43	Tc	Tc-99	0.07 pCi	0.002 pCi		300 pCi	200 pCi
Tellurium	52	Te	Te-125m	0.01 pCi	0.004 pCi		200 pCi	100 pCi
Tellurium	52	Te	Te-127m	0.005 pCi	0.001 pCi		60 pCi	50 pCi
Tellurium	52	Te	Te-127	0.06 pCi	0.03 pCi		300 pCi	200 pCi
Tellurium	52	Te	Te-129m	0.003 pCi	0.001 pCi		30 pCi	20 pCi
Tellurium	52	Te	Te-129	0.2 pCi	0.1 pCi		800 pCi	800 pCi
Tellurium	52	Te	Te-131m	0.01 pCi	0.006 pCi		60 pCi	40 pCi
Tellurium	52	Te	Te-132	0.007 pCi	0.004 pCi		30 pCi	20 pCi
Terbium	65	Tb	Tb-160	0.003 pCi	0.001 pCi		40 pCi	40 pCi
Thallium	81	Tl	Tl-200	0.09 pCi	0.04 pCi		400 pCi	200 pCi
Thallium	81	Tl	Tl-201	0.07 pCi	0.03 pCi		300 pCi	200 pCi
Thallium	81	Tl	Tl-202	0.03 pCi	0.008 pCi		100 pCi	70 pCi
Thallium	81	Tl	Tl-204	0.02 pCi	9e-4 pCi		100 pCi	60 pCi
Thorium	90	Th	Th-227	1e-5 pCi	6e-6 pCi		20 pCi	20 pCi
Thorium	90	Th	Th-228	3e-7 pCi	2e-7 pCi		7 pCi	10 pCi
Thorium	90	Th	Th-230	8e-8 pCi	3e-7 pCi		2 pCi	30 pCi
Thorium	90	Th	Th-231	0.05 pCi	0.04 pCi		200 pCi	200 pCi
Thorium	90	Th	Th-232	1e-6 pCi	1e-6 pCi		2 pCi	40 pCi
Thorium	90	Th	Th-natural	2e-6 pCi	2e-6 pCi		2 pCi	20 pCi
Thorium	90	Th	Th-234	0.002 pCi	0.001 pCi		20 pCi	50 pCi
Thulium	69	Tm	Tm-170	0.001 pCi	0.001 pCi		50 pCi	50 pCi
Thulium	69	Tm	Tm-171	0.004 pCi	0.008 pCi		500 pCi	500 pCi
Tin	50	Sn	Sn-113	0.01 pCi	0.002 pCi		90 pCi	80 pCi
Tin	50	Sn	Sn-125	0.004 pCi	0.003 pCi		20 pCi	20 pCi
Tungsten	74	W	W-181	0.08 pCi	0.004 pCi		400 pCi	300 pCi
Tungsten	74	W	W-185	0.03 pCi	0.004 pCi		100 pCi	100 pCi
Tungsten	74	W	W-187	0.02 pCi	0.01 pCi		70 pCi	60 pCi
Uranium	92	U	U-230	1e-5 pCi	4e-6 pCi		5 pCi	5 pCi
Uranium	92	U	U-232	3e-6 pCi	9e-7 pCi		30 pCi	30 pCi
Uranium	92	U	U-233	2e-5 pCi	4e-6 pCi		30 pCi	30 pCi
Uranium	92	U	U-234	2e-5 pCi	4e-6 pCi		30 pCi	30 pCi
Uranium	92	U	U-235	2e-5 pCi	4e-6 pCi		30 pCi	30 pCi
Uranium	92	U	U-236	2e-5 pCi	4e-6 pCi		30 pCi	30 pCi
Uranium	92	U	U-238	3e-6 pCi	5e-6 pCi		40 pCi	40 pCi
Uranium	92	U	U-240	0.008 pCi	0.006 pCi		30 pCi	30 pCi
Uranium	92	U	U-natural	5e-6 pCi	5e-6 pCi		30 pCi	30 pCi
Vanadium	23	V	V-48	0.006 pCi	0.002 pCi		30 pCi	30 pCi
Xenon	54	Xe	Xe-131m			0.4 pCi
Xenon	54	Xe	Xe-133m			0.3 pCi
Xenon	54	Xe	Xe-133			0.3 pCi
Xenon	54	Xe	Xe-135			0.1 pCi
Ytterbium	70	Yb	Yb-175	0.02 pCi	0.02 pCi		100 pCi	100 pCi
Yttrium	39	Y	Y-90	0.004 pCi	0.003 pCi		20 pCi	20 pCi
Yttrium	39	Y	Y-91m	0.8 pCi	0.6 pCi		3000 pCi	3000 pCi
Yttrium	39	Y	Y-91	0.001 pCi	0.001 pCi		30 pCi	30 pCi
Yttrium	39	Y	Y-92	0.01 pCi	0.01 pCi		60 pCi	60 pCi
Yttrium	39	Y	Y-93	0.006 pCi	0.005 pCi		30 pCi	30 pCi
Zinc	30	Zn	Zn-65	0.004 pCi	0.002 pCi		100 pCi	200 pCi
Zinc	30	Zn	Zn-69m	0.01 pCi	0.01 pCi		70 pCi	60 pCi
Zinc	30	Zn	Zn-69	0.2 pCi	0.3 pCi		2000 pCi	2000 pCi
Zirconium	40	Zr	Zr-93	0.004 pCi	0.01 pCi		800 pCi	800 pCi
Zirconium	40	Zr	Zr-95	0.004 pCi	0.001 pCi		60 pCi	60 pCi
Zirconium	40	Zr	Zr-97	0.004 pCi	0.003 pCi		20 pCi	20 pCi
Any single radio-nuclide not listed above with decay mode other than alpha emission or spontaneous fission and with radioactive half-life less than two hours.						0.03 pCi
Any single radio-nuclide not listed above with decay mode other than alpha emission or spontaneous fission and with radioactive half-life greater than two hours.				1e-4 pCi	1e-4 pCi	1e-4 pCi	3 pCi	3 pCi
Any single radio-nuclide not listed above which decays by alpha emission or spontaneous fission.				2e-8 pCi	2e-8 pCi	2e-8 pCi	0.03 pCi	0.03 pCi

Note 1:

"Submersion" values given are for submersion in a semispherical infinite cloud of airborne material.

Note 2:

These radon concentrations are appropriate for protection from radon-222 combined with its short-lived daughters. Alternatively, this value may be replaced by one-thirtieth (1/30) of a working level. (A "working level" is defined as any combination of short-lived radon-222 daughters, polonium-218, lead-214, bismuth-214, and polonium-214, in one liter of air, without regard to the degree of the equilibrium, that will result in the ultimate emission of 1.3e5 MeV of alpha particle energy.)

Note 3:

For soluble mixtures of U-238, U-234, and U-235 in air, chemical toxicity may be the limiting factor. If the percent by weight (enrichment) of U-235 is less than 5, the concentration value of 0.007 milligrams uranium per cubic meter of air. The specific activity for natural uranium is 6.77e-7 curies per gram uranium. The specific activity for other mixtures of U-238, U-235, and U-234, if not known, shall be:

SA = 3.6e-7 Ci/g U U-depleted

SA = (0.4 + 0.38 E + 0.0034 E²) 10^-6 E ≥ 0.72

where E is the percentage by weight of U-235, expressed as percent.

Note 4:

In any case where there is a mixture in air or water of more than one radionuclide, the limiting values for purposes of this table should be determined as follows:

If the identity and concentration of each radionuclide in the mixture are known, the limiting values should be derived as follows:

Determine, for each radionuclide in the mixture, the ratio between the quantity present in the mixture and the limit otherwise established in this table for the specific radionuclide when not in a mixture. The sum of such ratios for all the radionuclides in the mixture may not exceed "1" (i.e., "unity").

Example: If radionuclides a, b, and c are present in concentrations Ca, Cb, and Cc and if the applicable maximum permissible concentrations (MPCs) are MPC_a, MPC_b, and MPC_c respectively, then the concentrations shall be limited so that the following relationship exists:

(C_a / MPC_a) + (C_b / MPC_b) + (C_c / MPC_c) ≤ 1

If either the identity or the concentration of any radionuclide in the mixture is not known, the limiting values for purposes of this table shall be:
1. For purposes of the 'Air' columns of this table... 2e-14
2. For purposes of the 'Water' columns of this table... 3e-8

If any of the conditions specified below are met, the corresponding values specified below may be used in lieu of those specified in paragraph 2 above.
1. If the identity of each radionuclide in the mixture is known but the concentration of one or more of the radionuclides in the mixture is not known, the concentration limit for the mixture is the limit specified for this table for the radionuclide in the mixture having the lowest concentration limit; or
2. If the identity of each radionuclide in the mixture is not known, but it is known that certain radionuclides specified in this table are not present in the mixture, the concentration limit for the mixture is the lowest concentration limit specified in this table for any radionuclide which is not known to be absent from the mixture; or
3. - If it is known that Sr-90, I-125, I-126, I-129, I-131, I-133, Pb-210, Po-210, At-211, Ra-223, Ra-224, Ra-226, Ac-227, Ra-228, Th-230, Pa-231, Th-232, Th-nat, Cm-248, Cf-254, and Fm-256 are not present, Water = 3e-6 µCi/ml.
  - If it is known that Sr-90, I-125, I-126, I-129, I-131, I-133, Pb-210, Po-210, Ra-223, Ra-226, Ra-228, Pa-231, Th-nat, Cm-248, CF-254, and Fm-256 are not present, Water = 2e-6 µCi/ml.
  - If it is known that Sr-90, I-129 I-125, I-126, I-131, Pb-210, Ra-226, Ra-228, Cm-248 and Cf-254 are not present, Water = 6e-7 µCi/ml.
  - If it is known that I-129, Ra-226, and Ra-228 are not present, Water = 1e-7 µCi/ml.
  - If it is known that alpha-emitters and Sr-90, I-129, Pb-210, Ac-227, Ra-228, Pa-230, Pu-241, and Bk-249 are not present, Air = 1e-10 µCi/ml.
  - If it is known that alpha-emitters and Pb-210, Ac-227, Ra-228, and Pu-241 are not present, Air = 1e-11 µCi/ml.
  - If it known that alpha-emitters and Ac-227 are not present, Air = 1e-12 µCi/ml.
  - If it is known that Ac-227, Th-230, Pa-231, Pu-238, Pu-239, Pu-240, Pu-242, Pu-244, Cm-248, Cf-249, and Cf-251 are not present, Air = 1e-13 µCi/ml.

If a mixture of radionuclides consists of uranium and its daughters ore dust prior to chemical separation of the uranium from the ore, the values specified below may be used for uranium and its daughters through radium-226, instead of those from paragraph 1, 2, or 3 above.

For purposes of this the Air columns of this table, 3e-12 µCi/ml gross alpha activity; 2e-12 µCi/ml natural uranium; or 3 micrograms per cubic meter of air natural uranium.

For purposes of this note, a radionuclide may be considered as not present in a mixture if (a) the ratio of the concentration of that radionuclide in the mixture (C_a) to the concentration limit for that radionuclide specified in this table (MPC_a) does not exceed 1/10, (i.e., C_a / MPC_a ≤ 1/10) and (b) the sum of such ratios for all radionuclides considered as not present in the mixture does not exceed 1/4, (i.e., C_a / MPC_a + C_b / MPC_b + ... ≤ 1/4).

Note: To convert µCi/ml to SI units of megabecquerels per liter multiply the above values by 37.