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§ 35.433 Decay of strontium-90 sources for ophthalmic treatments.(a) Only an authorized medical physicist shall calculate the activity of each strontium-90 source that is used to determine the treatment times for ophthalmic treatments. The decay must be based on the activity determined under § 35.432. (b) A licensee shall retain a record of the activity of each strontium-90 source in accordance with § 35.2433. |
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