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(A) Values of A_{1} and
A_{2} for individual radionuclides, which are the bases for
many activity limits elsewhere in these rules are given in table 25-1 of
appendix A to this rule. The curie (Ci) values specified are obtained by
converting from the terabecquerel (TBq) value. The terabecquerel values are the
regulatory standard. The curie values are for information only and are not
intended to be the regulatory standard. Where values of
A_{1} or A_{2} are unlimited, it is for
radiation control purposes only. For nuclear criticality safety, some materials
are subject to controls placed on fissile material.

(B) (1) For individual radionuclides whose identities are
known, but which are not listed in table 25-1 of appendix A to this rule, the
A_{1} and A_{2} values contained in
table 25-3 of appendix C to this rule may be used. Otherwise, the licensee
shall obtain prior department approval of the A_{1} and
A_{2} values for radionuclides not listed in table 25-1 of
appendix A to this rule, before shipping the material.

(2) For individual radionuclides whose identities are known, but which are not listed in table 25-2 of appendix B to this rule, the exempt material activity concentration and exempt consignment activity values contained in table 25-3 of appendix C to this rule may be used. Otherwise, the licensee shall obtain prior department approval of the exempt material activity concentration and exempt consignment activity values for radionuclides not listed in table 25-2 of appendix B to this rule, before shipping the material.

(3) The licensee shall submit requests for prior approval, described under paragraphs (B)(1) and (B)(2) of this rule, to the department, in accordance with rule 3701:1-50-03 of the Administrative Code.

(C) In the calculations of A_{1} and
A_{2} for a radionuclide not in table 25-1 of appendix A to
this rule, a single radioactive decay chain, in which radionuclides are present
in their naturally occurring proportions, and in which no daughter radionuclide
has a half-life either longer than ten days, or longer than that of the parent
radionuclide, shall be considered as a single radionuclide, and the activity to
be taken into account, and the A_{1} or
A_{2} value to be applied shall be those corresponding to
the parent radionuclide of that chain. In the case of radioactive decay chains
in which any daughter radionuclide has a half-life either longer than ten days,
or greater than that of the parent radionuclide, the parent and those daughter
radionuclides shall be considered as mixtures of different radionuclides.

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

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

where B(i) is the activity of radionuclide I and
A_{1}(i) is the A_{1} value for
radionuclide I.

(2) For normal form radioactive material, the maximum quantity transported in a type A package is as follows:

where B(i) is the activity of radionuclide I and
A_{2}(i) is the A_{2} value for
radionuclide I.

(3) Alternatively, an A_{1} value for
mixtures of special form material may be determined as follows:

where f(i) is the fraction of activity of radionuclide I in the
mixture and A_{1}(i) is the appropriate
A_{1} value for radionuclide I.

(4) Alternatively, an A_{2} value for
mixtures of normal form material may be determined as follows:

where f(i) is the fraction of activity of radionuclide I in the
mixture and A_{2}(i) is the appropriate
A_{2} value for radionuclide I.

(5) The exempt activity concentration for mixtures of radionuclides may be determined as follows:

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

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

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

(E) 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_{1} or
A_{2} value, as appropriate, for the radionuclides in each
group may be used in applying the formulas in paragraph (D) of this rule.
Groups may be based on the total alpha activity and the total beta/gamma
activity when these are known, using the lowest A_{1} or
A_{2} values for the alpha emitters and beta/gamma
emitters.

Effective:
09/01/2011

R.C.
119.032 review dates:
05/24/2011 and
05/01/2016

Promulgated Under:
119.03

Statutory
Authority: 3748.04

Rule
Amplifies: 3748.04

Prior
Effective Dates: 10/19/2001, 10/22/06