"Primary beam" means ionizing radiation which passes through an aperture of the source housing by a direct path from the X-ray tube or a radioactive source located in the radiation source housing.
Nev. Admin. Code § 459.654
NRS 459.201
"Primary beam" means ionizing radiation which passes through an aperture of the source housing by a direct path from the X-ray tube or a radioactive source located in the radiation source housing.
Nev. Admin. Code § 459.654
NRS 459.201