Code of Massachusetts Regulations
105 CMR - DEPARTMENT OF PUBLIC HEALTH
Title 105 CMR 120.000 - The Control of Radiation
RECORDKEEPING REQUIREMENTS
Section 120.422 - Appendix C - Design Requirements for an Operator's Booth
Universal Citation: 105 CMR 120.000 MA Code of Regs 120.422
Current through Register 1531, September 27, 2024
(A) Space Requirements
(1) The operator
shall be allotted not less than 7.5 square feet (0.697
m2) of unobstructed floor space in the
booth.
(2) The operator's booth may
be any geometric configuration with no dimension of less than two feet (0.61
m).
(3) The space shall be allotted
excluding any encumbrance by the x-ray control panel, such as overhang, cables
or other similar encroachments.
(4)
The booth shall be located or constructed such that unattenuated direct scatter
radiation originating in the examination table or at the wall cassette shall
not reach the operator's station in the booth.
(B) Structural Requirements
(1) The booth walls
shall be permanently fixed barriers of at least seven feet (2.13 m)
high.
(2) When a door or movable
panel is used as an integral part of the booth structure, it must have an
interlock which will prevent an exposure when the door or panel is not
closed.
(3) Shielding shall be
provided to maintain exposure inside the booth equal to or less than two mR per
week.
(C) X-ray Control Placement. The x-ray exposure switch for the system shall be fixed within the booth and;
(1) Shall be at least 40 inches (1.02 m) from
any open edge of the booth and;
(2)
Shall allow the operator to use the majority of the available viewing
windows.
(D) Viewing System Requirements.
(1) Each booth shall have at least one
viewing device which will:
(a) Be so placed
that the operator can view the patient during any exposure; and,
(b) The device should be so placed that the
operator can have full view of any occupant of the room and should be so placed
that the operator can view any entry into the room. If any door that allows
access to the room cannot be seen from the booth, then that door must have an
interlock controlling the exposure, which will prevent the exposure if the door
is not closed.
(2) When
the viewing system is a window, the following requirements also apply:
(a) The viewing area shall be at least one
square foot (0.0929 m2).
(b) The design of the booth shall be such
that the operator's expected position when viewing the patient and operating
the x-ray system is at least 18 inches (0.457m) from the edge of the
booth.
(c) The material
constituting the window shall have at least the same lead equivalence as that
required in the booth's walls in which it is mounted.
(3) When the viewing system is by mirrors,
the mirror(s) shall be so located as to accomplish the general requirements of
105 CMR 120.422: Appendix C(A)(4).
(4) When the viewing system is by electronic
means:
(a) The camera shall be so located as
to accomplish the general requirements of
105
CMR 120.421: Appendix
C(A)(4); and,
(b) There shall be an
alternate viewing system as a backup for the primary system.
(c) Means shall be provided for the operator
to be able to orally communicate with the patient at all times.
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