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4. An A value for a mixture of radionuclides whose identities and respective activities are known may be determined as follows:
(a)for special form radioactive material:
(b)for other forms of radioactive material:
where
f(i) is the fraction of activity of nuclide in the mixture and A1(i) and A2(i) are the respective A1 and A2 values for nuclide i.
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