Ariz. Admin. Code § R9-7-734 - Full Calibration Measurements on Teletherapy Units
A. A licensee authorized to use a teletherapy
unit for medical use shall perform full calibration measurements on each
teletherapy unit:
1. Before the first medical
use of the unit; and
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 source or
following reinstallation of the teletherapy unit in a new location;
c. Following any repair of the teletherapy
unit that includes removal of the source or major repair of the components
associated with the source exposure assembly; and
3. At intervals not exceeding one
year.
B. To satisfy the
requirement of subsection (A), full calibration measurements shall include
determination of:
1. The output within
plusmn; 3 percent for the range of field sizes and for the distance or range of
distances used for medical use;
2.
The coincidence of the radiation field and the field indicated by the light
beam localizing device;
3. The
uniformity of the radiation field and its dependence on the orientation of the
useful beam;
4. Timer accuracy and
linearity over the range of use;
5.
On-off error; and
6. The accuracy
of all distance measuring and localization devices in medical use.
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) for physical decay for intervals
not exceeding one month for cobalt-60, six months for cesium-137, or at
intervals consistent with 1 percent decay for all other nuclides.
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 it was completed.
Notes
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