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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.

(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 in special
form 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 in normal
form and A_{2}(i) is the A_{2}
value for radionuclide i.

(3) 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:

where B(i) is the activity of
radionuclide i as special form radioactive material,
A_{1}(i) is the A_{1} value for
radionuclide i, C(j) is the activity of radionuclide j as normal form
radioactive material, and A_{2}(j) is the
A_{2} value for radionuclide j.

(4)
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.

(5)
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.

(6) 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.

(7) 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)

(1)
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.

(2) 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 (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] or A values for the alpha emitters and beta/gamma emitters, respectively.

Effective:
4/20/2018

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

Promulgated
Under:
119.03

Statutory Authority:
3748.04

Rule Amplifies:
3748.04

Prior Effective Dates: 10/19/2001, 10/22/2006, 09/01/2011,
06/25/2015