Subpart 1.
Shielding plan applicability.
inety days after November 5, 2007, the registrant is required
to have a shielding plan complete for new constructions or structural
remodeling of their radiation-producing equipment areas.
Subp. 2.
Shielding plan
requirements.
The shielding plan must show all basic assumptions used in
the development of the shielding specifications and show, at a minimum:
A. the dimensions of the rooms
concerned;
B. the normal location
of the radiation-producing system's x-ray tube's general direction of the
useful beam and the tube's travel and transverse limits;
C. locations of any windows, doors, or other
openings;
D. the location of the
operator's booth and the location of the control panel;
E. the structural composition and thickness
or lead equivalent of all walls, doors, partitions, and, if occupied spaces
above or below, the floor and ceiling of the rooms concerned;
F. the make and model of the
equipment;
G. the maximum technique
factors and the energy waveform;
H.
the type of examinations or treatments that will be performed with the
equipment;
I. information on the
anticipated workload of the systems in mA-minutes per week; and
J. the use of areas adjacent and an
estimation of the extent of occupancy in these areas.
Subp. 3.
Modifications.
The review of shielding plans must not preclude the
requirement of additional modifications should a subsequent analysis of
operating conditions indicate the possibility of an individual receiving a dose
in excess of the dose limits prescribed in parts 4732.0400 to 4732.0430.
Subp. 4.
Shielding
review.
Ninety days after November 5, 2007, the shielding plan must
be submitted to the commissioner prior to any new construction or structural
remodeling.
Subp. 5.
Exemptions.
Exemptions from the shielding review:
A. dental facilities with only intraoral
capabilities;
B. bone densitometry
units;
C. mammography
units;
D. podiatry units;
E. if the replacement of a piece of
radiation-producing equipment does not increase the risk of radiation beyond
the dose limits in parts 4732.0400 to 4732.0430;
F. self-shielded x-ray systems, such as
cabinet x-ray units, x-ray diffraction or fluorescence units with interlocked
shield barriers; and
G. for a
self-shielded accelerator, the applicant need not submit an evaluation of a
shielding plan if an evaluation by an appropriate regulatory authority has been
performed. The applicant must reference the evaluation and maintain a copy of
the evaluated shielding plan for commissioner review.
Subp. 6.
Records.
The following shielding plan documentation must be maintained
on a permanent basis by the registrant of the facility:
A. shielding plan data including all
assumptions and specifications;
B.
construction, or as-built, documents showing location and amounts of shielding
material installed;
C.
postconstruction radiation evaluation;
D. information regarding remedies, if any was
required;
E. all reevaluations of
the room shielding relative to changes in utilization that have been made;
and
F. the shielding plan
information must include the name of the individual completing the plan and the
date on which it was completed.
Subp.
7.
Permanent placard.
A permanent placard must be mounted in the room specifying
the amount and type of shielding in all walls, doors, partitions, and, if
occupied, spaces above or below the floor and ceiling. If mounting the
information is not practical, a registrant may post a notice in the room that
describes the document and states where it may be examined.
