Definitions

As used in sections 19-25d-2 to 19-25d-11, inclusive: "Aluminum equivalent" means the thickness of aluminum affording the same attenuation, under specified conditions, as the material in question. "Dead-man switch" means a switch so constructed that a circuit-closing contact can only be maintained by continuous pressure by the operator. "Diagnostic-type tube housing" means an x-ray tube housing so constructed that the leakage radiation at a distance of one meter from the target cannot exceed one hundred milliroentgens in one hour when the tube is operated at any of its specified ratings. "Filter" means material placed in the useful beam to absorb preferentially the less penetrating radiations. "Half-value layer (hvl)" means the thickness of an absorber required to reduce a beam or radiation to one-half its incident exposure dose rate. "Inherent filtration" means the filtration in the useful beam due to the window of the x-ray tube and any permanent tube enclosure. "Interlock" means a device for precluding access to an area of radiation hazard either by preventing entry or by automatically removing the hazard. "Kilovolts peak (kvp)" means the crest value in kilovolts of the potential of a pulsating potential generator. When only one-half of the wave is used, the value refers to the useful half of the wave. "Lead equivalent" means the thickness of lead affording the same attenuation, under specified conditions, as the material in question. "Leakage radiation" means all radiation coming from within the tube housing except the useful beam. "Owner" means a person or organization owning or having by law the actual control of the x-ray device or devices. "Primary protective barrier" means a barrier sufficient to attentuate the useful beam. "Protective apron" means an apron made of attenuating materials, used to reduce radiation exposure. "Protective barrier" means a barrier of attenuating materials, used to reduce radiation exposure. "Protective glove" means a glove made of attenuating materials, used to reduce radiation exposure. "Scattered radiation" means radiation that, during passage through matter, has been deviated in direction. "Secondary protective barrier" means a barrier sufficient to attenuate stray radiation. "Shutter" means a device, generally of lead, fixed to an x-ray tube housing to intercept useful beam. "Stray radiation" means radiation not serving any useful purpose. It includes leakage and secondary radiation. "Therapeutic-type tube housing" means an x-ray tube housing so constructed that the leakage radiation at a distance of one meter from the target cannot exceed one roentgen in one hour; and at a distance of five centimeters from any point on the surface of the housing accessible to the patient cannot exceed thirty roentgens in one hour when the tube is operated at any of its specified ratings. "Useful beam" means that part of the radiation which passes through the window, aperture, cone or other collimating device of the tube housing.