Section 325.5019. Definitions T.

(1) "Technique factors" means the conditions of operation. They are specific as follows:

(a)      For the capacitor energy storage equipment, peak tube potential in kV, and quantity of charge in mAs.

(b)     For field emission equipment rated for pulsed operation, peak tube potential in kV, and number of x-ray pulses.

(c)     For all other equipment, peak tube potential in kV,

and either tube current in mA and exposure time in seconds or the product of tube current and exposure time in mAs.

(2)     "Test" means a procedure for determining the characteristics or condition of a source of radiation, or circumstances relative thereto.

(3)     "Therapeutic type tube housing" means:

(a)     For x-ray therapy equipment not capable of operating at 500 kVp or above, an x-ray tube housing so constructed that the leakage radiation averaged over any 100 cm2  area at a distance of 1 meter from the source does not exceed 1 roentgen per hour when the tube is operated at its leakage technique factors.

(b)      For x-ray therapy equipment capable of operation at 500 kVp or above, an x-ray tube housing so constructed that the leakage radiation averaged over any 100 cm2 area at a distance of 1 meter from the source does not exceed 0.1% of the useful beam dose rate at 1 meter from the source for any of its operating conditions.

(4)     "Thermoluminescent dosimeter" or "TLD" means a device used for radiation monitoring which measures integrated dose by the principle of thermoluminescence.

(5)     "These rules" means all parts.

(6)     "Tube" means an x-ray tube, unless otherwise specified.

(7)     "Tube housing assembly" means the tube housing with tube installed. It includes high- voltage or filament transformers and other appropriate elements when they are contained within the tube housing.

(8)     "Tube rating chart" means the set of curves which specify the rated limits of operation of the tube in terms of the technique factors.

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