Ariz. Admin. Code § R9-7-736 - Full Calibration Measurements on Gamma Stereotactic Radiosurgery Units
A. A
licensee authorized to use a gamma stereotactic radiosurgery unit for medical
use shall perform full calibration measurements on each unit:
1. Before the first medical use of the
unit;
2. Before medical use under
the following conditions:
a. Whenever
spot-check measurements indicate that the output differs by more than 5 percent
from the output obtained at the last full calibration corrected mathematically
for radioactive decay;
b. Following
replacement of the sources or following reinstallation of the gamma
stereotactic radiosurgery unit in a new location; and
c. Following any repair of the gamma
stereotactic radiosurgery unit that includes removal of the sources or major
repair of the components associated with the source assembly; and
3. At intervals not exceeding one
year, with the exception that relative helmet factors need only be determined
before the first medical use of a helmet and following any damage to a
helmet.
B. To satisfy
the requirement of subsection (A), full calibration measurements shall include
determination of:
1. The output within
plusmn; 3 percent;
2. Relative
helmet factors;
3. Isocenter
coincidence;
4. Timer accuracy and
linearity over the range of use;
5.
On-off error;
6. Trunnion
centricity;
7. Treatment table
retraction mechanism, using backup battery power or hydraulic backups with the
unit off;
8. Helmet
microswitches;
9. Emergency timing
circuits; and
10. Stereotactic
frames and localizing devices (trunnions).
C. A licensee shall use the dosimetry system
described in R9-7-733(A) to measure the output for one set of exposure
conditions. The remaining radiation measurements required in subsection (B)(1)
may be made using a dosimetry system that indicates relative dose
rates.
D. A licensee shall make
full calibration measurements required by subsection (A) in accordance with
published protocols accepted by nationally recognized bodies.
E. A licensee shall mathematically correct
the outputs determined in subsection (B)(1) at intervals not exceeding one
month for cobalt-60 and at intervals consistent with 1 percent physical decay
for all other radionuclides.
F.
Full calibration measurements required by subsection (A) and physical decay
corrections required by subsection (E) shall be performed by an authorized
medical physicist.
G. A licensee
shall retain a record of each calibration for three years from the date of the
procedure.
Notes
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