(4) For mixtures of radionuclides whose identities and respective activities are known, the following conditions apply:

1. (a) For special form radioactive material, the maximum quantity transported in a Type A package is as follows:

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   Where B(i) is the activity of radionuclide i in special form, and A₁(i) is the A₁ value for radionuclide i.

2. (b) For normal form radioactive material, the maximum quantity transported in a Type A package:

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   Where B(i) is the activity of radionuclide i in normal form, and A₂(i) is the A₂ value for radionuclide i.

3. (c) If the package contains both special and normal form radioactive material, the activity that may be transported in a Type A package is as follows:

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   Where B(i) is the activity of radionuclide i as special form radioactive material, A₁(i) is the A₁ value for radionuclide i, C(j) is the activity of radionuclide j as normal form radioactive material, and A₂(j) is the A₂ value for radionuclide j.

4. (d) Alternatively, the A1 value for mixtures of special form material may be determined as follows:

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   Where f(i) is the fraction of activity for radionuclide i in the mixture and A1(i) is the appropriate A1 value for radionuclide i.

5. (e) Alternatively, the A2 value for mixtures of normal form material may be determined as follows:

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   Where f(i) is the fraction of activity for radionuclide i in the mixture and A2(i) is the appropriate A2 value for radionuclide i.

6. (f) The exempt activity concentration for mixtures of nuclides may be determined as follows:

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   Where f(i) is the fraction of activity concentration of radionuclide i in the mixture, and [A](i) is the activity concentration for exempt material containing radionuclide i.

7. (g) The activity limit for an exempt consignment for mixtures of radionuclides may be determined as follows:

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   Where f(i) is the fraction of activity of radionuclide i in the mixture and A(i) is the activity limit for exempt consignments for radionuclide i.

(b) When the identity of each radionuclide is known but the individual activities of some of the radionuclides are not known, the radionuclides may be grouped and the lowest [A] (activity concentration for exempt material) or A (activity limit for exempt consignment) value, as appropriate, for the radionuclides in each group may be used in applying the formulas in paragraph IV of this appendix. Groups may be based on the total alpha activity and the total beta/gamma activity when these are known, using the lowest [A] or A values for the alpha emitters and beta/gamma emitters, respectively.

Table A-1.—A1 and A2 Values for Radionuclides

Table A-2.—Exempt Material Activity Concentrations and Exempt Consignment Activity Limits for Radionuclides