180 Neb. Admin. Code, ch. 7, § 078

Current through September 17, 2024

Section 180-7-078 - PERIODIC SPOT-CHECKS FOR GAMMA STEREOTACTIC RADIOSURGERY UNITS

078.01FREQUENCY. 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.

078.02WRITTEN 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.

078.03MINIMUM 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.

078.04ASSURANCE 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.

078.05REPAIRS. A licensee must arrange for the repair of any system identified in 180 NAC 7-078.03 that is not operating properly.

078.06SYSTEM 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.

078.07RECORDS. 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.

180 Neb. Admin. Code, ch. 7, § 078

Amended effective 11/3/2020

Amended effective 6/14/2023