Footnotes:
· 1"Submersion"
means that values given are for submersion in a hemispherical semi-infinite
cloud of airborne material.
· 2These radionuclides have
radiological half-lives of less than 2 hours. The total effective dose
equivalent received during operations with these radionuclides might include a
significant contribution from external exposure. The DAC values for all
radionuclides, other than those designated Class "Submersion," are
based upon the committed effective dose equivalent due to the intake of the
radionuclide into the body and do NOT include potentially significant
contributions to dose equivalent from external exposures. The licensee may
substitute 1E-7 µCi/ml for the listed DAC to account for the submersion dose
prospectively, but should use individual monitoring devices or other radiation
measuring instruments that measure external exposure to demonstrate compliance
with the limits. (See § 16.6(c)).
· 3For soluble mixtures of
U-238, U-234, and U-235 in air, chemical toxicity may be the limiting factor
(see § 16.6(a)(5)). If the percent by weight (enrichment) of U-235 is not
greater than 5, the concentration value for a 40-hour workweek is 0.2
milligrams uranium per cubic meter of air average. For any enrichment, the
product of the average concentration and time of exposure during a 40-hour
workweek shall not exceed 8E-3 (SA) µCi-hr/ml, where SA is the specific
activity of the uranium inhaled. The specific activity for natural uranium is
6.77E-7 curies per gram U.
The specific activity for other mixtures of U-238, U-235, and U-234, if not
known, shall be:
SA = 3.6E-7 curies/gram U U-depleted
SA = [0.4 + 0.38 (enrichment) + 0.0034 (enrichment)2] E-6 , enrichment = 0.72
where enrichment is the
percentage by weight of U-235, expressed as percent.
NOTE: 1. If the identity
of each radionuclide in a mixture is known but the concentration of one or more
of the radionuclides in the mixture is not known, the DAC for the mixture shall
be the most restrictive DAC of any radionuclide in the mixture.
2. If the identity of each radionuclide in the
mixture is not known, but it is known that certain radionuclides specified in
this appendix are not present in the mixture, the inhalation ALI, DAC, and
effluent and sewage concentrations for the mixture are the lowest values
specified in this appendix for any radionuclide that is not known to be absent
from the mixture; or
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Table 1
Occupational Values
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Table 2
Effluent Concentrations
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Table 3
Releases to Sewers
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Col.
1 Oral Ingestion ALI (µCi)
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Col.
2
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Col.
3
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Col.
1
Air (µCi/ml)
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Col.
2
Water (µCi/ml)
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Monthly Average
Concentration (µCi/ml)
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Inhalation
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Atonic
No.
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Radionuclide
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Class
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ALI (µCi)
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DAC (µCi/ml)
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If it is known that Ac-227-D and Cm-250-W are not present
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-
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7E-4
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3E-13
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-
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-
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-
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If, in addition, it is known that Ac-227-W,Y, Th-229-W,Y, Th-230-W,
Th-232-W,Y, Pa-231-W,Y, Np-237-W, Pu-239-W, Pu-240-W, Pu-242-W, Am-241-W,
Am-242m-W, Am-243-W, Cm-245-W, Cm-246-W, Cm-247-W, Cm-248-W, Bk-247-W,
Cf-249-W, and Cf-251-W are not present
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-
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7E-3
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3E-12
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-
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-
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-
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If, in addition, it is known that Sm-146-W, Sm-147-W, Gd-148-D,W,
Gd-152-D,W, Th-228-W,Y, Th-230-Y, U-232-Y, U-233-Y, U-234-Y, U-235-Y,
U-236-Y, U-238-Y, Np-236-W, Pu-236-W,Y, Pu-238-W,Y, Pu-239-Y, Pu-240-Y,
Pu-242-Y, Pu-244-W,Y, Cm-243-W, Cm-244-W, Cf-248-W, Cf-249-Y, Cf-250-W,Y,
Cf-251-Y, Cf-252-W,Y, and Cf-254-W,Y are not present
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-
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7E-2
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3E-11
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-
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-
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-
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If, in addition, it is known that Pb-210-D, Bi-210m-W, Po-210-D,W,
Ra-223-W, Ra-225-W, Ra-226-W, Ac-225-D,W,Y, Th-227-W,Y, U-230-D,W,Y,
U-232-D,W, Pu-241-W, Cm-240-W, Cm-242-W, Cf-248-Y, Es-254-W, Fm-257-W, and
Md-258-W are not present
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-
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7E-1
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3E-10
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-
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-
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-
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If, in addition, it is known that Si-32-Y, Ti-44-Y, Fe-60-D, Sr-90-Y,
Zr-93-D, Cd-113m-D, Cd-113-D, In-115-D,W, La-138-D, Lu-176-W, Hf-178m-D,W,
Hf-182-D,W, Bi-210m-D, Ra-224-W, Ra-228-W, Ac-226-D,W,Y, Pa-230-W,Y,
U-233-D,W, U-234-D,W, U-235-D,W, U-236-D,W, U-238-D,W, Pu-241-Y, Bk-249-W,
Cf-253-W,Y, and Es-253-W are not present
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-
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7E+0
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3E-9
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-
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-
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-
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If it is known that Ac-227-D,W,Y, Th-229-W,Y, Th-232-W,Y, Pa-231-W,Y,
Cm-248-W, and Cm-250-W are not present
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-
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-
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-
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1E-14
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-
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-
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If, in addition, it is known that Sm-146-W, Gd-148-D,W, Gd-152-D,
Th-228-W,Y, Th-230-W,Y, U-232-Y, U-233-Y, U-234-Y, U-235-Y, U-236-Y, U-238-Y,
U-Nat-Y, Np-236-W, Np-237-W, Pu-236-W,Y, Pu-238-W,Y, Pu-239-W,Y, Pu-240-W,Y,
Pu-242-W,Y, Pu-244-W,Y, Am-241-W, Am-242m-W, Am-243-W, Cm-243-W, Cm-244-W,
Cm-245-W, Cm-246-W, Cm-247-W, Bk-247-W, Cf-249-W,Y, Cf-250-W,Y, Cf-251-W,Y,
Cf-252-W,Y, and Cf-254-W,Y are not present
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-
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-
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-
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1E-13
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-
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-
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If, in addition, it is known that Sm-147-W, Gd-152-W, Pb-210-D, Bi-210m-W,
Po-210-D,W, Ra-223-W, Ra-225-W, Ra-226-W, Ac-225-D,W,Y, Th-227-W,Y,
U-230-D,W,Y, U-232-D,W, U-Nat-W, Pu-241-W, Cm-240-W, Cm-242-W, Cf-248-W,Y,
Es-254-W, Fm-257-W, and Md-258-W are not present
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-
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-
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-
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1E-12
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-
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If, in addition it is known that Fe-60, Sr-90, Cd-113m, Cd-113, In-115,
I-129, Cs-134, Sm-145, Sm-147, Gd-148, Gd-152, Hg-194 (organic), Bi-210m,
Ra-223, Ra-224, Ra-225, Ac-225, Th-228, Th-230, U-233, U-234, U-235, U-236,
U-238, U-Nat, Cm-242, Cf-248, Es-254, Fm-257, and Md-258 are not present
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-
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-
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-
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-
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1E-6
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1E-5
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3 If a mixture of radionuclides consists of uranium
and its daughters in ore dust (10 µm AMAD particle distribution assumed) prior
to chemical separation of the uranium from the ore, the following values may beused for the DAC of the mixture: 6E-11 µCi of gross alpha
activity from uranium-238, uranium-234, thorium-230, and radium-226 per
milliliter of air; 3E-11 µCi of natural uranium per milliliter of air; or 45
micrograms of natural uranium per cubic meter of air.
4. If the identity and concentration of each
radionuclide in a mixture are known, the limiting values should be derived as
follows: determine, for each radionuclide in the mixture, the ratio between the
concentration present in the mixture and the concentration otherwise
established in Appendix 16-C for the specific radionuclide when not in a
mixture. The sum of such ratios for all of 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 DACs are DACA,
DACB, and DACC, respectively, then the concentrations
shall be limited so that the following relationship exists:
CA CB CC
------- + ------- + ------- <= 1
DACA DACB DACC
Appendix 16-C Index
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