A licensee shall retain a record of the basis for authorizing the release of an individual in accordance with § 35.75, if the total effective dose equivalent is calculated by—
Using the retained activity rather than the activity administered;
Using an occupancy factor less than 0.25 at 1 meter;
Using the biological or effective half-life; or
Considering the shielding by tissue.
A licensee shall retain a record that the instructions required by § 35.75(b) were provided to a breast-feeding female if the radiation dose to the infant or child from continued breast-feeding could result in a total effective dose equivalent exceeding 5 mSv (0.5 rem).
The records required by paragraphs (a) and (b) of this section must be retained for 3 years after the date of release of the individual.