Wash. Admin. Code § 246-240-204
In addition to the requirements of WAC 246-222-030:
(1) A licensee shall provide radiation safety instruction, initially and at least annually, to personnel caring for patients or human research subjects who cannot be released under WAC 246-240-122. To satisfy this requirement, the instruction must be commensurate with the duties of the personnel and include:
(b) Visitor control, including:
[Statutory Authority: RCW 70.98.050. WSR 06-05-019, § 246-240-204, filed 2/6/06, effective 3/9/06.]