Ohio Admin. Code 3701:1-58-63 - 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, as
described in rule
3701:1-58-66
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 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 paragraph (A) of this rule, full calibration
measurements must include determination of:
(1) The output within three
percent
per
cent ;
(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 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
at intervals not exceeding one month for cobalt-60 and at intervals consistent
with one percent
per
cent radioactive decay for all other radionuclides.
(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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