Utah Administrative Code
Topic - Environmental Quality
Title R313 - Waste Management and Radiation Control, Radiation
Rule R313-30 - The rapeutic Radiation Machines
Section R313-30-10 - Information on Radiation Shielding Required for Plan Reviews
Universal Citation: UT Admin Code R 313-30-10
Current through Bulletin 2024-06, March 15, 2024
(1) 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 structures.
(b) Wall, floor, and ceiling areas struck by
the useful beam shall have primary barriers. For an adjacent area that is
normally unoccupied, barrier thicknesses may be less than the required
thickness, if:
(i) That area where the
exposure rates and exposures exceed the limits specified in
R313-15-301(1)
is permanently fenced or walled to prevent access;
(ii) The appropriate warning signs are posted
at appropriate intervals and locations on the fence or wall;
(iii) The exposure rates and exposures
outside the fence or wall are less than the limits specified in
R313-15-301(1);
(iv) Access to the area is controlled by the
operator, and once access is gained, the therapeutic radiation machine cannot
be operated until the area has been cleared and access is again controlled by
the operator;
(v) The ceiling is of
sufficient thickness to reduce exposure due to skyshine, so that the exposure
rates and exposures surrounding the facility are less than the limits specified
in
R313-15-301(1);
and
(vi) The primary barrier is of
sufficient thickness to ensure that the exposure rates and exposures from the
primary beam in spaces in adjacent buildings are less than the limits specified
in
R313-15-301(1).
(c) Secondary barriers shall be
provided in wall, floor, and ceiling areas not having primary
barriers.
(2) Therapeutic Radiation Machines up to 150 kV (photons only). In addition to the requirements listed in R313-30-10(1), therapeutic radiation machine facilities which produce only photons with a maximum energy less than or equal to 150 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 or drawing indicating: the scale of the blueprint or drawing;
direction of North; normal location of the therapeutic radiation machine's
radiation ports; the port's travel and traverse limits; general directions of
the useful beam; locations of 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
R313-15-101
of these rules.
(d) The structural
composition and thickness or the lead or concrete equivalent of walls, doors,
partitions, floor, and ceiling of the rooms concerned.
(e) The type of occupancy of adjacent areas
inclusive of space above and below the rooms concerned. If there is an exterior
wall, show distance to the closest areas 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 the physical conditions; that is the primary and
secondary or leakage barriers, restricted and unrestricted areas, entry doors;
and shielding material in the facility.
(i)
If commercial software is used to generate shielding requirements, please also
identify the software used and the version or revision date.
(ii) 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.
(3) Therapeutic Radiation Machines over 150 kV. In addition to the requirements listed in R313-30-10(1), therapeutic radiation machine facilities which produce photons with a maximum energy in excess of 150 kV and electrons and 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 energies and types of radiation produced, that
is photon and 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 or drawing, including both floor plan and elevation views,
indicating relative orientation of the therapeutic radiation machine; scale;
types; thickness and minimum density of shielding materials; direction of
North; the locations and size of penetrations through shielding barriers,
ceiling, walls and floor; as well as details of the doors and maze.
(d) The structural composition and thickness
or concrete equivalent of walls, doors, partitions, floor, and ceiling of the
rooms concerned.
(e) The type of
occupancy of adjacent areas inclusive of space above and below the rooms
concerned. If there is an exterior wall, show distance to the closest areas
where it is likely that individuals may be present.
(f) Description of assumptions that were used
in shielding calculations including, but not limited to; design energy, for
example a room may be designed for 6 MV unit although only a 4 MV unit is
currently proposed; workload; presence of integral beam-stop in unit; occupancy
and uses of adjacent areas; fraction of time that useful beam will intercept
permanent barriers, 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
the physical conditions; that is the primary and secondary or leakage barriers,
restricted and unrestricted areas, small angle scatter, entry 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.
(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.
(4) Neutron Shielding. In addition to the requirements listed in R313-30-10(3), therapeutic radiation machine facilities which are capable of operating above 10 MV shall submit shielding plans which contain, as a minimum, the following additional information:
(a) The structural
composition, thickness, minimum density and location of neutron shielding
material.
(b) Description of
assumptions that were used in neutron shielding calculations including, but not
limited to, neutron spectra as a function of energy, neutron flux 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 the physical conditions, that is,
restricted and unrestricted areas, entry 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.
(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.
(d) The
methods and instrumentation which will be used to verify the adequacy of
neutron shielding installed in the facility.
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