Ariz. Admin. Code § R9-7-739 - Periodic Spot-checks for Gamma Stereotactic Radiosurgery Units
A. A licensee
authorized to use a gamma stereotactic radiosurgery unit for medical use shall
perform spot-checks of each gamma stereotactic radiosurgery facility and on
each unit:
1. Monthly;
2. Before the first use of the unit on a
given day; and
3. After each source
installation.
B. A
licensee shall:
1. Perform the measurements
required by subsection (A) in accordance with written procedures established by
an authorized medical physicist. That individual need not actually perform the
spot-check measurements.
2. Have
the authorized medical physicist review the results of each spot-check within
15 days. The authorized medical physicist shall notify the licensee as soon as
possible in writing of the results of each spot-check.
C. To satisfy the requirements of subsection
(A)(1), spot-checks shall, at a minimum:
1.
Assure proper operation of:
a. Treatment table
retraction mechanism, using backup battery power or hydraulic backups with the
unit off;
b. Helmet
microswitches;
c. Emergency timing
circuits; and
d. Stereotactic
frames and localizing devices (trunnions).
2. Determine:
a. The output for one typical set of
operating conditions measured with the dosimetry system described in
R9-7-733(B);
b. The difference
between the measurement made in subsection (C)(2)(a) and the anticipated
output, expressed as a percentage of the anticipated output;
c. Source output against computer
calculation;
d. Timer accuracy and
linearity over the range of use;
e.
On-off error; and
f. Trunnion
centricity.
D. To satisfy the requirements of subsections
(A)(2) and (A)(3), spot-checks shall assure proper operation of:
1. Electrical interlocks at each gamma
stereotactic radiosurgery room entrance;
2. Source exposure indicator lights on the
gamma stereotactic radiosurgery unit, on the control console, and in the
facility;
3. Viewing and intercom
systems;
4. Timer
termination;
5. Radiation monitors
used to indicate room exposures; and
6. Emergency off buttons.
E. A licensee shall arrange for
the repair of any system identified in subsection (C) that is not operating
properly as soon as possible.
F. If
the results of the checks required in subsection (D) indicate the malfunction
of any system, a licensee shall lock the control console in the off position
and not use the unit except as may be necessary to repair, replace, or check
the malfunctioning system.
G. A
licensee shall retain a record of each check required by subsections (C) and
(D) for three years from the date of the procedure, and a copy of the
procedures required by subsection (B) until licensee terminates all medical
activities involving the radiosurgery unit.
Notes
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