Ohio Admin. Code 3701:1-58-64 - Periodic spot-checks for teletherapy units
(A) A licensee authorized to use teletherapy
units for medical use shall perform output spot-checks on each teletherapy unit
once in each calendar month that include determination of:
(1) Timer accuracy, and timer linearity over
the range of use;
(2) On-off
error;
(3) The coincidence of the
radiation field and the field indicated by the light beam localizing device;
(4) The accuracy of all distance
measuring and localization devices used for medical use;
(5) The output for one typical set of
operating conditions measured with the dosimetry system described in paragraph
(B) of rule
3701:1-58-60;
and
(6) The difference between the
measurement made in paragraph (A)(5) of this rule and the anticipated output,
expressed as a percentage of the anticipated output (i.e., the value obtained
at last full calibration corrected mathematically for radioactive decay).
(B) A licensee shall
perform measurements required by paragraph (A) of this rule in accordance with
written procedures established by the authorized medical physicist. That
individual need not actually perform the spot-check measurements.
(C) A licensee shall have the authorized
medical physicist review the results of each spot-check within fifteen days.
The authorized medical physicist shall notify the licensee as soon as possible
in writing of the results of each spot-check.
(D) A licensee authorized to use a
teletherapy unit for medical use shall perform safety spot-checks of each
teletherapy facility once in each calendar month and after each source
installation to assure proper operation of:
(1) Electrical interlocks at each teletherapy
room entrance;
(2) Electrical or
mechanical stops installed for the purpose of limiting use of the primary beam
of radiation (restriction of source housing angulation or elevation, carriage
or stand travel and operation of the beam on-off mechanism);
(3) Source exposure indicator lights on the
teletherapy unit, on the control console, and in the facility;
(4) Viewing and intercom systems;
(5) Treatment room doors from inside and
outside the treatment room; and
(6) Electrically assisted treatment room
doors with the teletherapy unit electrical power turned off.
(E) If the results of the checks
required in paragraph (D) of this rule 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.
(F) A licensee shall
retain a record of each spot-check required by paragraphs (A) and (D) of this
rule, and a copy of the procedures required by paragraph (B), in accordance
with rule
3701:1-58-95
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
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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