Nebraska Administrative Code › Topic - HEALTH AND HUMAN SERVICES SYSTEM › Title 180 - CONTROL OF RADIATION › Chapter 20 - THERAPEUTIC RADIATION MACHINES FOR HUMAN USE › Appendix 20-A - INFORMATION ON RADIATION SHIELDING REQUIRED FOR PLAN REVIEWS

Current through June 17, 2024
I. ALL THERAPEUTIC RADIATION MACHINES MUST SUBMIT THE
	 FOLLOWING INFORMATION:
(A) Basic information including: name and telephone number of the
	 individual responsible for preparation of the shielding plan; name and
	 telephone number of the supervisor at the registrant's facility; and the street
	 address, including room number of the therapeutic radiation machine. The plan
	 should also indicate whether this is a new structure or a modification to
	 existing structure or structures;
(B) All wall, floor, and ceiling areas struck by the useful beam must
	 have primary barriers; and
(C) Secondary barriers must be provided in all wall, floor, and ceiling
	 areas not having primary barriers.
II. THERAPEUTIC RADIATION MACHINES UP TO 150 KILOVOLTS (KV)
	 - PHOTONS ONLY.
In addition to the information listed in Section
	 I, registrants using therapeutic radiation machines that produce only photons
	 with a maximum energy less than or equal to 150 kilovolts (kV) must submit
	 shielding plans which contain, at 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 machine including total weekly
	 radiation output, expressed in gray or rad, or air kerma at 1 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 or drawing indicating: scale, 0.25 inch = 1
	 foot is typical; direction of North; normal location of the therapeutic
	 radiation machine's radiation port or ports; the port's travel and traverse
	 limits; general direction or directions 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 therapeutic radiation
	 machine treatment room, the location of the operator's booth must be noted on
	 the plan and the operator's station at the control panel must be behind a
	 protective barrier sufficient to ensure compliance with 180 NAC 4-005;
(D) The structural composition and thickness or lead or concrete
	 equivalent of all walls, doors, partitions, floor, and ceiling of the room or
	 rooms concerned;
(E) The type of occupancy of all adjacent areas inclusive of space
	 above and below the room or rooms concerned. If there is an exterior wall, show
	 distance to the closest area or areas where it is likely that individuals may
	 be present; and
(F) At least one example calculation which shows the methodology used
	 to determine the amount of shielding required for each physical condition,
	 primary and secondary or leakage barriers, restricted and unrestricted areas,
	 entry door or doors and shielding material in the facility:
(i) If commercial software is used to generate shielding requirements,
	 also identify the software used and the version or revision date.
(ii) Submit quality control sample calculations to verify the result
	 obtained with the software.
III. THERAPEUTIC RADIATION MACHINES OVER 150 KILOVOLTS
	 (KV).
In addition to the information listed in Section I,
	 registrants using therapeutic radiation machines that produce photons with a
	 maximum energy in excess of 150 kilovolts (kV) or electrons must 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 or energies and type or types of radiation produced, photon or
	 electron. The target to isocenter distance must be specified;
(B) Maximum design workload for the machine including total weekly
	 radiation output, expressed in gray or rad at 1 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 or drawing [including both floor plan and
	 elevation views] indicating relative orientation of the therapeutic radiation
	 machine, scale, 0.25 inch = 1 foot is the typical scale, type or types,
	 thickness and minimum density of shielding material or materials, 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 or doors and
	 maze;
(D) The structural composition and thickness or concrete equivalent of
	 all walls, doors, partitions, floor, and ceiling of the room or rooms
	 concerned;
(E) The type of occupancy of all adjacent areas inclusive of space
	 above and below the room or rooms concerned. If there is an exterior wall, show
	 distance to the closest area or areas 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, room may be designed for 6
	 megavolt (MV) unit although only a 4 megavolt (MV) unit is currently proposed,
	 work load, presence of integral beam stop in unit, occupancy and use or uses of
	 adjacent areas, fraction of time that useful beam will intercept each permanent
	 barrier, walls, floor and ceiling, and expected radiation exposure in both
	 restricted and unrestricted areas; and
(G) At least one example calculation which shows the methodology used
	 to determine the amount of shielding required for each physical condition,
	 primary and secondary or leakage barriers, restricted and unrestricted areas,
	 small angle scatter, entry door or doors and maze, and shielding material in
	 the facility:
(i) If commercial software is used to generate shielding requirements,
	 also identify the software used and the version or revision date; and
(ii) If the software used to generate shielding requirements is not in
	 the open literature, also submit quality control sample calculations to verify
	 the result obtained with the software.
IV. NEUTRON SHIELDING.
In addition to the
	 information listed in Section III, registrants using therapeutic radiation
	 machines that are capable of operating above 10 megavolts (MV) must 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, restricted and unrestricted areas, entry door or doors and maze, and
	 neutron shielding material utilized in the facility:
(i) If commercial software is used to generate shielding requirements,
	 also identify the software used and the version or revision date; and (ii) If
	 the software used to generate shielding requirements is not in the open
	 literature, also submit quality control sample calculations to verify the
	 results obtained with the software; and
(D) The method or methods and instrumentation that will be used to
	 verify the adequacy of all neutron shielding installed in the facility.
V. REFERENCES.
References for shielding
	 designs are as follows and are available for viewing at the Department of
	 Health and Human Services, Division of Public Health, Office of Radiological
	 Health, 301 Centennial Mall South, 3rd Floor, Lincoln, Nebraska 68509: