Hawaii Administrative Rules › Title 11 - DEPARTMENT OF HEALTH › Subtitle 1 - GENERAL DEPARTMENTAL PROVISIONS › Chapter 45 - RADIATION CONTROL › Subchapter 14 - THERAPEUTIC RADIATION MACHINES › Appendix A of Subchapter 14 - Information on Radiation Shielding Required for Plan Reviews (2/2/93)

Current through June, 2024
I.
ALL THERAPEUTIC RADIATION
					 MACHINES
A. Basic facility information including: name, telephone
					 number and department registration number of the individual responsible for
					 preparation of the shielding plan; name and telephone number of the facility
					 supervisor; and the street address including room number of the external beam
					 radiation therapy facility. The plan should also indicate whether this is a new
					 structure or a modification to existing structure(s).
B. All wall, floor, and ceiling areas struck by the useful
					 beam shall have primary barriers.
C. Secondary barriers shall be provided in all wall, floor,
					 and ceiling areas not having primary barriers.
II.
THERAPEUTIC RADIATION MACHINES UP TO ONE
					 HUNDRED FIFTY kV (PHOTONS ONLY)
In addition to the requirements listed in Section I above,
					 therapeutic radiation machine facilities which produce only photons with a
					 maximum energy less than or equal to one hundred fifty kV shall submit
					 shielding plans which contain, as a minimum, the following additional
					 information:
A. Equipment specifications, including the manufacturer and
					 model number of the therapeutic radiation machine, as well as the maximum
					 technique factors.
B. Maximum design workload for the facility including
					 total weekly radiation output, expressed in gray (rad) or air kerma at one
					 meter, total beam-on time per day or week, the average treatment time per
					 patient, along with the anticipated number of patients to be treated per day or
					 week.
C. A facility blueprint/drawing indicating: scale 0.25 inch
					 = one foot is typical; direction of North; normal location of the therapeutic
					 radiation machine's radiation port(s); the port's travel and traverse limits;
					 general direction(s) of the useful beam; locations of any windows and doors;
					 and the location of the therapeutic radiation machine control panel. If the
					 control panel is located inside the external beam radiation therapy treatment
					 room, the location of the operator's booth shall be noted on the plan and the
					 operator's station at the control panel shall be behind a protective barrier
					 sufficient to ensure compliance with subchapter 4.
D. The structural composition and thickness or
					 lead/concrete equivalent of all walls, doors, partitions, floor, and ceiling of
					 the room(s) concerned.
E. The type of occupancy of all adjacent areas inclusive of
					 space above and below the room(s) concerned. If there is an exterior wall, show
					 distance to the closest area(s) where it is likely that individuals may be
					 present.
F. At least one example calculation which shows the
					 methodology used to determine the amount of shielding required for each
					 physical condition (ie: primary and secondary/leakage barriers, restricted and
					 unrestricted areas, entry door(s)) and shielding material in the facility.
(1) If commercial software is used to generate shielding
					 requirements, please also identify the software used and the version/ revision
					 date.
(2) If the software used to generate shielding requirements
					 is not in the open literature, please also submit quality control sample
					 calculations to verify the result obtained with the software.
Ill.
THERAPEUTIC RADIATION MACHINES OVER ONE
					 HUNDRED FIFTY kV
In addition to the requirements listed in Section I above,
					 therapeutic radiation machine facilities which produce photons with a maximum
					 energy in excess of one hundred fifty kV and/or electrons and/or protons or
					 other subatomic particles shall submit shielding plans which contain, as a
					 minimum, the following additional information:
A. Equipment specifications including the manufacturer and
					 model number of the therapeutic radiation machine, and gray (rad) at the
					 isocenter and the energy(s) and type(s) of radiation produced (ie: photon,
					 electron).
The source to isocenter distance shall be
					 specified.
B. Maximum design workload for the facility including total
					 weekly radiation output expressed in gray (rad) at one meter, total beam-on
					 time per day or week, the average treatment time per patient, along with the
					 anticipated number of patients to be treated per day or week.
C. Facility blueprint/drawing including both floor plan and
					 elevation views indicating relative orientation of the therapeutic radiation
					 machine, scale 0.25 inch = one foot is typical, type(s), thickness and minimum
					 density of shielding material(s), direction of North, the locations and size of
					 all penetrations through each shielding barrier (ceiling, walls and floor), as
					 well as details of the door(s) and maze.
D. The structural composition and thickness or concrete
					 equivalent of all walls, doors, partitions, floor, and ceiling of the room(s)
					 concerned.
E. The type of occupancy of all adjacent areas inclusive of
					 space above and below the room(s) concerned. If there is an exterior wall, show
					 distance to the closest area(s) where it is likely that individuals may be
					 present.
F. Description of all assumptions that were in shielding
					 calculations including, but not limited to, design energy (ie., room may be
					 designed for six MV unit although only a four MV unit is currently proposed,
					 work-load, presence of integral beam-stop in unit, occupancy and use(s) of
					 adjacent areas, fraction of time that useful beam will intercept each permanent
					 barrier (walls, floor and ceiling) and "allowed" radiation exposure in both
					 restricted and unrestricted areas.
G. At least one example calculation which shows the
					 methodology used to determine the amount of shielding required for each
					 physical condition (ie., primary and secondary/leakage barriers, restricted and
					 unrestricted areas, small angle scatter, entry door(s) and maze) and shielding
					 material in the facility.
(1) If commercial software is used to generate shielding
					 requirements, please also identify the software used and the version/ revision
					 date.
(2) If the software used to generate shielding requirements
					 is not in the open literature, please also submit quality control sample
					 calculations to verify the result obtained with the software.
IV.
NEUTRON SHIELDING
In addition to the requirements listed in Section III
					 above, therapeutic radiation machine facilities which are capable of operating
					 above ten MV shall submit shielding plans which contain, as a minimum, the
					 following additional information:
A. The structural composition, thickness, minimum density
					 and location of all neutron shielding material.
B. Description of all assumptions that were used in neutron
					 shielding calculations including, but not limited to, neutron spectra as a
					 function of energy, neutron fluence rate, absorbed dose and dose equivalent
					 (due to neutrons) in both restricted and unrestricted areas.
C. At least one example calculation which shows the
					 methodology used to determine the amount of neutron shielding required for each
					 physical condition (ie., restricted and unrestricted areas, entry door(s) and
					 maze) and neutron shielding material utilized in the facility.
(1) If commercial software is used to generate shielding
					 requirements, please also identify the software used and the version/ revision
					 date.
(2) If the software used to generate shielding requirements
					 is not in the open literature, please also submit quality control sample
					 calculations to verify the result obtained with the software.
D. The method(s) and instrumentation which will be used to
					 verify the adequacy of all neutron shielding installed in the facility.
V.
REFERENCES
A. NCRP Report 49, "Structural Shielding Design and
					 Evaluation for Medical Use of X Rays and Gamma Rays of Energies Up to 10 MeV"
					 (1976).
B. NCRP Report 51, "Radiation Protection Design Guidelines
					 for 0.1-100 MeV Particle Accelerator Facilities" (1977).
C. NCRP Report 79, "Neutron Contamination from Medical
					 Electron Accelerators" (1984).