Mich. Admin. Code R. 333.5331 - Enclosures
Rule 331.
(1)
An enclosure shall be a permanent part of the building or equipment. Portable
shields 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. Recommended shielding is posted
on the departments website.
(3) In
a radiographic room, wall and floor areas exposed to the useful beam plus an
additional area extending at least 30 centimeters (1 foot) beyond shall be
provided with a primary protective barrier as determined by workload, use and
occupancy factors, and distance. All vertical primary protective barriers
specified in this rule shall extend continuously from the floor to a minimum
height of 2.1 meters (7 feet).
(4)
Secondary protective barriers shall be provided in the radiographic room
ceiling and in those walls not requiring primary barriers.
(5) Control apparatus for the radiographic
equipment shall be shielded by a primary protective barrier which cannot be
removed from a protective position between the operator and the radiation
source during machine operation.
(6) Movable barriers with electrical
interlocks shall not be approved in place of compliance with subrule (5) of
this rule.
(7) Exposure switch
location and control shield shall be oriented so that, at arm's length from the
exposure switch, the operator is not exposed to the useful beam, leakage
radiation, or any radiation scattered only once.
(8) The operator shall be able to see and
communicate with the patient from a shielded position at the control panel.
When an observation window is provided, it shall have a lead equivalence at
least equal to that required of the control barrier and shall be installed so
that the attenuation effectiveness of the barrier is not impaired.
(9) At times it may be necessary for
personnel to remain within an operating room or special procedure installation
during radiographic exposures. A primary protective barrier shall be provided
for personnel protection under these circumstances unless necessary technique
prevents use of such protection. This barrier may be movable if necessary.
Movable barriers shall not be permitted in place of the provisions of subrules
(3) and (5) of this rule.
Notes
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