| (A) electrical interlocks at each teletherapy room
entrance;
(B) electrical or mechanical stops installed for the
purpose of limiting use of the primary beam of radiation (restriction
of sealed source housing angulation or elevation, carriage or stand
travel and operation of the beam "on-off" mechanism);
(C) sealed source exposure indicator lights on the
teletherapy unit, on the control console, and in the facility;
(D) viewing and intercom systems;
(E) treatment room doors from inside and outside the
treatment room; and
(F) electrically assisted treatment room doors with
the teletherapy unit electrical power turned "off".
(4) The licensee shall have an authorized medical physicist
review the results of each spot check and submit a written report
to the licensee within 15 days of the spot check.
(5) If the results of the checks required in paragraph
(3) of this subsection indicate the malfunction of any system, the
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.
(6) The licensee shall retain a record of each spot
check required by paragraphs (1) and (3) of this subsection, in accordance
with subsection (xxx) of this section for inspection by the department.
The record shall include the following:
(A) date of the spot-check;
(B) manufacturer's name and model and serial number
for the teletherapy unit, and sealed source and instrument used to
measure the output of the teletherapy unit;
(C) assessment of timer linearity and constancy;
(D) calculated "on-off" error;
(E) determination of the coincidence of the radiation
field and the field indicated by the light beam localizing device;
(F) the determined accuracy of each distance measuring
and localization device;
(G) the difference between the anticipated output and
the measured output;
(H) notations indicating the operability of each entrance
door electrical interlock, each electrical or mechanical stop, each
sealed source exposure indicator light, and the viewing and intercom
system and doors;
(I) name of the individual who performed the periodic
spot-check; and
(J) the signature of the authorized medical physicist
who reviewed the record of the spot check.
(nnn) Periodic spot checks for remote afterloader units.
(1) A licensee authorized to use a remote afterloader
unit for medical use shall perform spot checks of each remote afterloader
facility and on each unit as follows:
(A) before the first use each day of use of a high
dose-rate, medium dose-rate, or pulsed dose-rate remote afterloader
unit;
(B) before each patient treatment with a low dose-rate
remote afterloader unit; and
(C) after each sealed source installation.
(2) The licensee shall perform the measurements required
by paragraph (1) of this subsection in accordance with written procedures
established by an authorized medical physicist. That individual need
not actually perform the spot check measurements. The licensee shall
maintain a copy of the written procedures in accordance with subsection
(xxx) of this section for inspection by the department.
(3) The licensee shall have an authorized medical physicist
review the results of each spot check and submit a written report
to the licensee within 15 days of the spot check.
(4) To satisfy the requirements of paragraph (1) of
this subsection, spot checks shall, at a minimum, assure proper operation
of the following:
(A) electrical interlocks at each remote afterloader
unit room entrance;
(B) sealed source exposure indicator lights on the
remote afterloader unit, on the control console, and in the facility;
(C) viewing and intercom systems in each high dose-rate,
medium dose-rate, and pulsed dose-rate remote afterloader facility;
(D) emergency response equipment;
(E) radiation monitors used to indicate the sealed
source position;
(F) timer accuracy;
(G) clock (date and time) in the unit's computer; and
(H) decayed sealed source(s) activity in the unit's
computer.
(5) If the results of the checks required in paragraph
(4) of this subsection indicate the malfunction of any system, the
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.
(6) The licensee shall maintain a record, in accordance
with subsection (xxx) of this section for inspection by the department,
of each check required by paragraph (4) of this subsection. The record
shall include the following, as applicable:
(A) date of the spot-check;
(B) manufacturer's name and model and serial number
for the remote afterloader unit and sealed source;
(C) an assessment of timer accuracy;
(D) notations indicating the operability of each entrance
door electrical interlock, radiation monitors, sealed source exposure
indicator lights, viewing and intercom systems, clock, and decayed
sealed source activity in the unit's computer;
(E) name of the individual who performed the periodic
spot-check; and
(F) the signature of an authorized medical physicist
who reviewed the record of the spot-check.
(ooo) Periodic spot checks for gamma stereotactic radiosurgery
units.
(1) A licensee authorized to use a gamma stereotactic
radiosurgery unit for medical use shall perform spot checks of each
gamma stereotactic radiosurgery facility and on each unit as follows:
(A) monthly;
(B) before the first use of the unit on each day of
use; and
(C) after each source installation.
(2) The licensee shall perform the measurements required
by paragraph (1) of this subsection in accordance with written procedures
established by an authorized medical physicist with a specialty in
therapeutic radiological physics. That individual need not actually
perform the spot check measurements. The licensee shall maintain a
copy of the written procedures in accordance with subsection (xxx)
of this section for inspection by the department.
(3) The licensee shall have an authorized medical physicist
review the results of each spot check and submit a written report
to the licensee within 15 days of the spot check.
(4) To satisfy the requirements of paragraph (1)(A)
of this subsection, spot checks shall, at a minimum, achieve the following
by:
(A) assurance of proper operation of these items:
(i) treatment table retraction mechanism, using backup
battery power or hydraulic backups with the unit "off;"
(ii) helmet microswitches;
(iii) emergency timing circuits; and
(iv) stereotactic frames and localizing devices (trunnions);
and
(B) determination of the following:
(i) the output for one typical set of operating conditions
measured with the dosimetry system described in subsection (iii)(2)
of this section;
(ii) the difference between the measurement made in
clause (i) of this subparagraph and the anticipated output, expressed
as a percentage of the anticipated output, (i.e., the value obtained
at last full calibration corrected mathematically for physical decay);
(iii) sealed source output against computer calculation;
(iv) timer accuracy and linearity over the range of
use;
(v) "on-off" error; and
(vi) trunnion centricity.
(5) To satisfy the requirements of paragraph (1)(B)
and (C) of this subsection, spot checks shall assure proper operation
of the following:
(A) electrical interlocks at each gamma stereotactic
radiosurgery room entrance;
(B) sealed source exposure indicator lights on the
gamma stereotactic radiosurgery unit, on the control console, and
in the facility;
(C) viewing and intercom systems;
(D) timer termination;
(E) radiation monitors used to indicate room exposures;
and
Cont'd... |
