Ohio Admin. Code 3701:1-58-61 - 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;
(2) Before medical use under the
following conditions:
(a) Whenever spot-check
measurements, as described in rule
3701:1-58-64
of the Administrative Code, indicate that the output differs by more than five
percent
per
cent 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 paragraph (A) of this rule, full calibration measurements must
include determination of:
(1) The output
within plus or minus three percent
per cent 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 paragraph (A) of rule
3701:1-58-60
of the Administrative Code to measure the output for one set of exposure
conditions. The remaining radiation measurements required in paragraph (B)(1)
of this rule may be made using a dosimetry system that indicates relative dose
rates.
(D) A licensee shall make
full calibration measurements required by paragraph (A) of this rule in
accordance with published protocols accepted by nationally recognized bodies.
(E) A licensee shall
mathematically correct the outputs determined in paragraph (B)(1) of this rule
for radioactive decay for intervals not exceeding one month for cobalt-60, six
months for cesium-137, or at intervals consistent with one
percent
per
cent decay for all other nuclides.
(F) Full calibration measurements required by
paragraph (A) of this rule and radioactive decay corrections required by
paragraph (E) of this rule must be performed by the authorized medical
physicist.
(G) A licensee shall
retain a record of each calibration in accordance with rule
3701:1-58-94
of the Administrative Code.
Notes
Promulgated Under: 119.03
Statutory Authority: 3748.02, 3748.04
Rule Amplifies: 3748.04
Prior Effective Dates: 08/15/2005, 10/04/2010
Promulgated Under: 119.03
Statutory Authority: 3748.02, 3748.04
Rule Amplifies: 3748.04
Prior Effective Dates: 8/15/2005, 10/4/10
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