R313. Environmental Quality, Waste Management and Radiation Control, Radiation.
R313-28. Use of X-Rays in the Healing Arts.
R313-28-10. Purpose and Scope.
(1) The purpose of the rules in R313-28 is to prescribe the requirements for the use of x-rays in the healing arts.
(2) The rules set forth herein are adopted pursuant to the provisions of Sections 19-3-104(4) and 19-3-104(7).
As used in R313-28, the following definitions apply:
"Accessible surface" means the external surface of the enclosure or housing provided by the manufacturer.
"Actual focal spot" refer to "Focal spot."
"Aluminum equivalent" means the thickness of aluminum, type 1100 alloy, affording the same attenuation, under specified conditions, as the material in question. The nominal chemical composition of type 1100 aluminum alloy is 99.00 percent minimum aluminum, 0.12 percent copper.
"Assembler" means individuals engaged in the business of assembling, replacing, or installing one or more components into an x-ray system or subsystem. The term includes the owner of an x-ray system or his or her employee or agent if they assemble components into an x-ray system that is subsequently used to provide professional or commercial services.
"Attenuation block" means a block or stack, having appropriate dimensions 20 cm by 20 cm by 3.8 cm, of type 1100 aluminum alloy or other materials having equivalent attenuation.
"Automatic EXPOSURE control" means a device which automatically controls one or more technique factors in order to obtain, at a preselected location, a required quantity of radiation. Phototimer and ion chamber devices are included in this category.
"Barrier" refer to "Protective barrier".
"Beam axis" means a line from the source through the centers of the x-ray fields.
"Beam-limiting device" means a device which provides a means to restrict the dimensions of the x-ray field.
"Certified components" means components of x-ray systems which are subject to regulations promulgated under Public Law 90-602, the Radiation Control for Health and Safety Act of 1968.
"Certified system" means an x-ray system which has one or more certified components.
"Changeable filters" means filters designed to be removed by the operator.
"Coefficient of variation (C)" means the ratio of the standard deviation to the mean value of a population of observations.
"Computed tomography" means the production of a tomogram by the acquisition and computer processing of x-ray transmission data.
"Control panel" means that part of the x-ray control upon which are mounted the switches, knobs, push buttons, and other hardware necessary for setting the technique factors.
"Cooling curve" means the graphical relationship between heat units stored and cooling time.
"CT" means computed tomography.
"CT gantry" means the tube housing assemblies, beam-limiting devices, detectors, and the supporting structures and frames which house these components.
"Dead-man switch" means a switch so constructed that a circuit closing contact can be maintained only by continuous pressure on the switch by the operator.
"Diagnostic source assembly" means the tube housing assembly with a beam-limiting device attached.
"Diagnostic x-ray system" means an x-ray system designed for irradiation of part of the human body for the purpose of recording or visualization for diagnostic purposes.
"Entrance EXPOSURE rate" means the EXPOSURE free in air per unit time at the point where the useful beam enters the patient.
"Equipment" refer to "X-ray equipment".
"Field emission equipment" means equipment which uses an x-ray tube in which electron emission from the cathode is due solely to the action of an electric field.
"Filter" means material placed in the useful beam to absorb preferentially selected radiations.
"Fluoroscopic imaging assembly" means a subsystem in which x-ray photons produce a fluoroscopic image. It includes equipment housing, electrical interlocks, the primary protective barrier, and structural material providing linkage between the image receptor and the diagnostic source assembly.
"Focal spot" means the area on the anode of the x-ray tube bombarded by the electrons accelerated from the cathode and from which the useful beam originates. Also referred to as "Actual focal spot."
"Gonad shield" means a protective barrier for the testes or ovaries.
"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 one-half of its original value. In this definition, the contribution of scatter radiation, other than that which might be present initially in the beam concerned, is deemed to be excluded.
"Healing arts screening" means the use of x-ray equipment to examine individuals who are asymptomatic for the disease for which the screening is being performed and the use of x-rays are not specifically and individually ordered by a licensed practitioner of the healing arts legally authorized to order x-ray tests for the purpose of diagnosis.
"Heat unit" means a unit of energy equal to the product of the peak kilovoltage, milliamperes, and seconds: for example, kVp times mA times seconds.
"HVL" refer to "half value layer."