Section R12-1-737. Periodic Spot-checks for Teletherapy Units

H.   Full calibration measurements required by subsection (A) and	A.	A licensee authorized to use teletherapy units for medical use
physical decay corrections required by subsection (G) shall be		shall perform output spot-checks on each teletherapy unit once
performed by an authorized medical physicist.		in each calendar month that include determination of:
I.     A licensee shall retain a record of each calibration for three		1.     Timer accuracy, and timer linearity over the range of use;
years from the date it was completed.		2.     On-off error;
Historical Note		3.     The coincidence of the radiation field and the field indi-
New Section made by final rulemaking at 13 A.A.R.		cated by the light beam localizing device;
1217, effective May 5, 2007 (Supp. 07-1).		4.     The accuracy of all distance measuring and localization
		devices used for medical use;
R12-1-736.     Full Calibration Measurements on Gamma Ste-		5.     The output for one typical set of operating conditions
reotactic Radiosurgery Units		measured with the dosimetry system described in R12-1-
A.   A licensee authorized to use a gamma stereotactic radiosur-		733(B); and
gery unit for medical use shall perform full calibration mea-		6.     The difference between the measurement made in subsec-
surements on each unit:		tion (A)(5) and the anticipated output, expressed as a per-
1.     Before the first medical use of the unit;		centage of the anticipated output.
2.     Before medical use under the following conditions:	B.	A licensee shall perform measurements required by subsection
a.      Whenever  spot-check   measurements  indicate  that		(A) in accordance with written procedures established by an
the output differs by more than 5 percent from the		authorized medical physicist. That individual need not actually
output obtained at the last full calibration corrected		perform the spot-check measurements.
mathematically for radioactive decay;	C.	A licensee shall have an authorized medical physicist review
b.     Following replacement of the sources or following		the results of each spot-check within 15 days. The authorized
reinstallation of the gamma stereotactic radiosurgery		medical physicist shall notify the licensee as soon as possible
unit in a new location; and		in writing of the results of each spot-check.
c.      Following  any  repair  of  the  gamma  stereotactic	D.	A licensee authorized to use a teletherapy unit for medical use
radiosurgery  unit  that  includes  removal  of   the		shall perform safety spot-checks of each teletherapy facility
sources or major repair of the components associ-		once in each calendar month and after each source installation
ated with the source assembly; and		to assure proper operation of:
3.     At intervals not exceeding one year, with the exception		1.     Electrical interlocks at each teletherapy room entrance;
that  relative   helmet  factors  need   only  be  determined		2.     Electrical or mechanical stops installed for the purpose of
before the first medical use of a helmet and following any		limiting use of the primary beam of radiation (restriction
damage to a helmet.		of source housing angulation or elevation, carriage or

stand travel and operation of the beam on-off mecha- nism);

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 treat- ment room; and

6.        Electrically assisted treatment room doors with the tele- therapy unit electrical power turned off.

E.       If the results of the checks required in subsection (D) 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 subsections (A) and (D) for three years from the date of the procedure, and a copy of the procedures required by subsec- tion (B) until licensee terminates all medical activities involv- ing the teletherapy unit.

Historical Note

New Section made by final rulemaking at 13 A.A.R.

1217, effective May 5, 2007 (Supp. 07-1).