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Ohio Laws and Rules

(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.

(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.

Five Year Review (FYR) Dates:
11/19/2015 and
11/15/2020

Promulgated
Under: 119.03

Statutory
Authority: 3748.04

Rule
Amplifies: 3748.04

Prior
Effective Dates: 10/19/2001, 10/22/06, 9/1/11,
6/25/15

**Prior History:** (Effective: 6/25/2015

Five Year Review (FYR) Dates:
04/09/2015 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,
9/1/11)