Mich. Admin. Code R. 333.5315 - Enclosures
Rule 315.
(1)
An enclosure shall be a permanent part of the building or equipment. Portable
protective barriers shall not be used for permanent installations.
(2) The degree of protection required for an
enclosure shall be determined by the workload, use and occupancy factors, and
the tube potential, tube current, mechanical movement, and distance. The design
shall be subject to approval by the department.
(3) All wall, ceiling, and floor areas that
can be irradiated by the useful beam plus an additional area extending at least
30 centimeters (1 foot) beyond shall be provided with a primary protective
barrier.
(4) For equipment capable
of operating above 150 kVp, the control station shall be outside of the therapy
room.
(5) The enclosure shall be so
constructed that individuals may at all times be able to escape from
within.
(6) If the radiation
exposure rate within the therapy room is so high that an individual who is
accidentally in the treatment room when the machine is turned "ON" may receive
as much as 1250 mR exposure during the time required to reach an access door,
special cut-off, or panic buttons shall be required. When pressed, these
buttons, operable by open hand at appropriate positions about the treatment
room, shall cause the irradiation to be terminated.
(7) Effective means shall be provided to
prevent access to the treatment room during exposure. For equipment capable of
operating above 150 kVp, each access door to the treatment room shall be
provided with a fail-safe interlock. The interlock system shall be so designed
that the failure of any 1 component cannot jeopardize the safety of the system,
such as the use of series connected double switch assemblies at access doors,
and dual interlock relays. If an access door is opened when the machine is
"ON", the interlock shall cause termination or reduction of exposure as
specified in R 333.5312(14).
(8)
Red warning signal lights, energized only when the useful beam in "ON", shall
be located on the control panel and near each entrance to the therapy room.
Under conditions as specified in subrule (6) of this rule a visible signal
shall also be located within the therapy room. Depending upon control panel and
door locations, a single warning signal light may be sufficient to comply with
this subrule.
Notes
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