Section 325.5011. Definitions L.

(1) "Leakage radiation" means radiation emanating from the diagnostic or therapeutic source assembly except for the useful beam and radiation produced when the exposure switch or timer is not activated.

(2)         "Leakage technique factors" means the technique factors associated with the tube housing assembly which are used in measuring leakage radiation. They are defined as follows:

(a)     For capacitor energy storage equipment, the maximum rated number of exposures in an hour for operation at the maximum rated peak tube potential with the quantity of charge per exposure being 10 millicoulombs (mAs) or the minimum obtainable from the unit, whichever is larger.

(b)     For field emission equipment rated for pulsed operation, the maximum rated number of x-ray pulses in an hour for operation at the maximum rated peak tube potential.

(c)      For all other equipment, the maximum rated continuous tube current for the maximum rated peak tube potential.

(3)     "Level" means radiation flux or intensity at a specific point. It is sometimes expressed in terms of the dose an individual would receive if he were at that point or location.

(4)        "License" means a license issued pursuant to parts 2 or 3 except where otherwise specified.

(5)      "Light field" means the area of intersection of the light beam from the beam-limiting device and 1 of the set of planes parallel to and including the plane of the image receptor, whose perimeter is the locus of points at which the illumination is 1/4 of the maximum in the intersection.

(6)       "Line-voltage regulation" means the difference between the no-load and the load line potentials expressed as a percent of the load line potential; that is,

Percent line-voltage regulation =100 (Vn - Vi)/Vi Where:                  Vn = No-load line potential and

Vi = Load line potential.

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