How are mixtures of radionuclides reported if the composition of the mixture is known?

The requirements for reporting mixtures of radionuclides depend on whether the composition of the mixture is known or unknown. If the identity and quantity (in curies) of each radionuclide involved in a release is known, the decision whether to report the release must be made in the following manner: for each radionuclide in the mixture, determine the ratio between the quantity released and the RQ for the radionuclide. If the sum of the ratios for all radionuclides is less than one, the release need not be reported. If the sum of the ratios is equal to or greater than one, the release must be reported to the National Response Center.