North Dakota Administrative Code › Title 33.1 - Department of Environmental Quality › Article 33.1-10 - Radiological Health Rules › Chapter 33.1-10-06 - X-Rays in the Healing Arts › Section 33.1-10-06-02 - Definitions

Current through Supplement No. 393, July, 2024
As used in this chapter, the following definitions
				  apply:
1. "Absorbed dose" means the
				energy imparted by ionizing radiation per unit mass of irradiated material. The
				units of absorbed dose are the gray (Gy) and the rad.
2. "Accessible surface" means surface of
				equipment or of an equipment part that can be touched by persons without the
				use of a tool.
3. "Added
				filtration" means any filtration which is in addition to the inherent
				filtration.
4. "Air kerma" means
				kerma in air (see "kerma").
5. "Air
				kerma rate" means the air kerma per unit of time.
6. "AKR" means air kerma rate.
7. "Allied health" means occupations of
				medical personnel who are not physicians and are qualified by special training
				to undergo cross-training into x-ray as a limited x-ray machine operator. Refer
				to appendix G for qualifying professions.
8. "Aluminum equivalent" means the thickness
				of type 1100 aluminum alloy affording the same attenuation, under specified
				conditions, as the material in question. (The nominal chemical composition of
				type 1100 aluminum alloy is ninety-nine percent minimum aluminum,
				twelve-hundredths percent copper.)
9. "As low as reasonably achievable" (ALARA)
				means making every reasonable effort to maintain the exposures to radiation as
				far below dose limits as is practicable.
10. "Assembler" means any person 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 the employee or agent who assembles components into an x-ray system
				that is subsequently used to provide professional or commercial
				services.
11. "Attenuation block"
				means a block or stack, having dimensions twenty centimeters by twenty
				centimeters by three and eight-tenths centimeters, of type 1100 aluminum alloy
				or other materials having equivalent attenuation.
12. "Automatic exposure control" means a
				device which automatically controls one or more technique factors in order to
				obtain at a preselected location or locations a required quantity of radiation
				(includes devices such as phototimers and ion chambers).
13. "Barrier" (see "protective
				barrier").
14. "Beam axis" means
				the axis of rotation of the beam-limiting device from the source through the
				centers of the x-ray fields.
15.
				"Beam-limiting device" means a device which provides a means to restrict the
				dimensions of the useful beam.
16.
				"Biennium" means a two-year cycle.
17. "Board certified" means an individual who
				has completed an accredited school of medical radiography or chiropractic
				radiography and has passed a national registry examination.
18. "Board eligible" means an individual who
				has obtained eligibility to take a national registry examination in radiologic
				technology or chiropractic radiologic technology.
19. "Bone densitometry system" means a
				medical device which uses electronically produced ionizing radiation to
				determine the density of bone structures of human patients.
20. "Calibration" means the determination of:
a. The response or reading of an instrument
				relative to a series of known radiation values over the range of the
				instrument; or
b. The strength of a
				source of radiation relative to a standard.