Current through March 20, 2024
078.01
FREQUENCY. A
licensee authorized to use a gamma stereotactic radiosurgery unit for medical
use must perform spot-checks of each gamma stereotactic radiosurgery facility
and on each unit:
(A) Monthly;
(B) Before the first use of the unit on a
given day; and
(C) After each
source installation.
078.02
WRITTEN
PROCEDURES. The licensee must have the authorized medical
physicist:
(A) Establish written procedures
for performing the spot-checks required in 180 NAC 7-078.01; and
(B) Review and sign the results of each
spot-check required by 180 NAC 7-078.01 within fifteen days of the check. The
authorized medical physicist need not actually perform the spot-check
measurements. The authorized medical physicist must notify the licensee within
ten days in writing of the results of the spot check.
078.03
MINIMUM
REQUIREMENTS. To satisfy the requirements of 180 NAC 7-078.01(A),
spot-checks must, at a minimum:
(A) Assure
proper operation of:
(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,
localizing devices, and trunnions; and
(B) Determine:
(i) The output for one typical set of
operating conditions measured with the dosimetry system described in 180 NAC
7-072.02;
(ii) The difference
between the measurement made in 180 NAC 7-078.03(B)(i) and the anticipated
output, expressed as a percentage of the anticipated output, or the value
obtained at last full calibration corrected mathematically for physical
decay;
(iii) Source output against
computer calculation;
(iv) Timer
accuracy and linearity over the range of use;
(v) On-off error; and
(vi) Trunnion
centricity.
078.04
ASSURANCE OF PROPER
OPERATION. To satisfy the requirements of 180 NAC 7-078.01(B) and
(C), spot-checks must assure proper operation of:
(A) Electrical interlocks at each gamma
stereotactic radiosurgery room entrance;
(B) 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
(F) Emergency off
buttons.
078.05
REPAIRS. A licensee must arrange for the repair of any
system identified in 180 NAC 7-078.03 that is not operating properly.
078.06
SYSTEM
MALFUNCTION. If the results of the checks required in 180 NAC
7-078.04 indicate the malfunction of any system, a licensee must lock the
control console in the off position and not use the unit unless necessary to
repair, replace, or check the malfunctioning system.
078.07
RECORDS. A
licensee must retain a record of each check required by 180 NAC 7-078.03 and
7-078.04 and according to 180 NAC 7-111.
