Kentucky Administrative Regulations › Title 902 - CABINET FOR HEALTH AND FAMILY SERVICES - DEPARTMENT FOR PUBLIC HEALTH › Chapter 100 - Radiology › Section 902 KAR 100:115 - Diagnostic x-ray

Current through Register Vol. 51, No. 1, July 1, 2024
RELATES TO: KRS 211.842-211.852,
				211.990(4)
NECESSITY, FUNCTION, AND CONFORMITY: The Cabinet for Human
				Resources is authorized by
				KRS
				211.844 to provide by administrative
				regulation for the registration and licensing of the possession or use of
				sources of ionizing or electronic product radiation and the handling and
				disposal of radioactive waste. The purpose of this administrative regulation is
				to provide requirements for the possession, use, and operation of diagnostic
				x-ray systems in relation to the healing arts.
Section 1. Applicability. This administrative
			 regulation shall apply to diagnostic x-ray systems in relation to the healing
			 arts, to persons, equipment and materials used in connection with the
			 possession, use or operation of the systems.
Section 2. Warning Label. The control panel
			 containing the main power switch shall bear the following warning statement or
			 an equivalent statement, legible and accessible to view: "WARNING: This x-ray
			 unit may be dangerous to patient and operator unless safe exposure factors and
			 operating instructions are observed."
Section
			 3. Battery Charge Indicator. On battery-powered x-ray generators,
			 visual means shall be provided on the control panel to indicate whether the
			 battery is in a state of charge adequate for proper operation.
Section 4. Leakage Radiation from the
			 Diagnostic Source Assembly. The leakage radiation from the diagnostic source
			 assembly measured at distances of one (1) meter from the source shall not
			 exceed 100 milliroentgens in one (1) hour if the x-ray tube is operated at its
			 leakage technique factors. Compliance shall be determined by measurements
			 averaged over an area of 100 square centimeters with no linear dimension
			 greater than twenty (20) centimeters.
Section
			 5. Radiation from Components other than the Diagnostic Source
			 Assembly. The radiation emitted by a component other than the diagnostic source
			 assembly shall not exceed two (2) milliroentgens in one (1) hour at five (5)
			 centimeters from accessible surfaces of the component if it is operated in an
			 assembled x-ray system under conditions for which it was designed. Compliance
			 shall be determined by measurements averaged over an area of 100 square
			 centimeters with no linear dimension greater than twenty (20)
			 centimeters.
Section 6. Beam
			 Quality.
(1) The half-value layer (HVL) of the
			 useful beam for a given x-ray tube potential shall not be less than the values
			 shown in the following table:
TABLE OF ACCEPTABLE HALF-VALUE LAYER
							 (HVL)
Design operating range (Kilovolts
							 peak)
Measured potential (Kilovolts peak)
Half-value Layer (Millimeters of
							 aluminum)
Below 50
30
0.3
40
0.4
49
0.5
50 to 70
50
1.2
60
1.3
70
1.5
Above 70
71
2.1
80
2.3
90
2.5
100
2.7
110
3.0
120
3.2
130
3.5
140
3.8
150
4.1
(2) If
			 it is necessary to determine the half-value layer at an exposure tube potential
			 which is not listed in the table above, linear interpolation or extrapolation
			 may be made;
(3) The above HVL
			 criteria is considered to have been met if it can be demonstrated that the
			 aluminum equivalent of the total filtration in the primary beam is not less
			 than that shown in the following table:
TABLE OF FILTRATION REQUIRED VS.
							 OPERATING VOLTAGE
Operating Voltage (kVp)
Total Filtration (inherent) plus added) (millimeters
							 aluminum equivalent)
Below 50
0.5
50 - 70
1.5
Above 70
2.5
(4)
			 X-ray tubes with beryllium windows shall have a minimum of five-tenths (0.5) mm
			 aluminum equivalent filtration permanently mounted in the useful
			 beam;
(5) For capacitor energy
			 storage equipment, compliance shall be determined with the maximum quantity of
			 charge per exposure; and
(6) The
			 required minimal aluminum equivalent filtration shall include the filtration
			 contributed by materials which are always present between the focal spot of the
			 tube and the patient (e.g., a tabletop if the tube is mounted "under the table"
			 and inherent filtration of the tube).