35.2433—Records of decay of strontium-90 sources for ophthalmic treatments.
(a)
A licensee shall maintain a record of the activity of a strontium-90 source required by § 35.433 for the life of the source.
(b)
The record must include—
(1)
The date and initial activity of the source as determined under § 35.432; and
(2)
For each decay calculation, the date and the source activity as determined under § 35.433.