Current through all regulations passed and filed through March 18, 2024
(A) Values of A1 and
A2 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
A1 or A2 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 A1 and
A2 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 A1 and A2 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 252 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 A1 and A2
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 A1 or A2 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:
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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) For
normal 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 normal form and
A2(i) is the A2 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:
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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)
Alternatively, an 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 of radionuclide i in the
mixture and A1 (i) is the appropriate
A1 value for radionuclide i.
(5) Alternatively, an
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 of radionuclide i in the
mixture and A2(i) is the appropriate
A2 value for radionuclide i.
(6) The exempt activity concentration for
mixtures of radionuclides 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] 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:
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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
A1 or A2 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
A1 or A2 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.
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