Section 325.5009. Definitions G and H.

(1) "General purpose radiographic x-ray system" means a radiographic x-ray system which, by design or use, is not limited to radiographic examination of specific anatomical regions.

(2)     "Half-value layer" or "HVL" means the thickness of specified material which attenuates the beam of radiation to an extent that the exposure rate is reduced to 1/2 of its original value. In this definition the contribution of all scattered radiation, other than any which might be present initially in the beam concerned, is deemed to be excluded.

(3)     "High radiation area" means an area, accessible to individuals, in which there exists such radiation, that an individual could receive in any 1 hour a dose in excess of 100 millirems.

(4)      "Human use" means the internal or external administration of radiation or radioactive materials to human beings.

History: 1954 ACS 85, Eff. Dec. 3, 1975; 1954 ACS 98 Eff. Mar 9, 1979.