Nebraska Administrative Code
Topic - HEALTH AND HUMAN SERVICES SYSTEM
Title 180 - CONTROL OF RADIATION
Chapter 7 - MEDICAL USE OF RADIOACTIVE MATERIAL
Section 180-7-076 - PERIODIC SPOT-CHECKS FOR TELETHERAPY UNITS

Universal Citation: 180 NE Admin Rules and Regs ch 7 ยง 076

Current through September 17, 2024

076.01 DETERMINANTS. A licensee authorized to use teletherapy units for medical use must perform output spot-checks on each teletherapy unit once in each calendar month that include determination of:

(A) Timer accuracy, and timer linearity over the range of use;

(B) On-off error;

(C) The coincidence of the radiation field and the field indicated by the light beam localizing device;

(D) The accuracy of all distance measuring and localization devices used for medical use;

(E) The output for one typical set of operating conditions measured with the dosimetry system described in 180 NAC 7-072.02; and

(F) The difference between the measurement made in 180 NAC 7-076.01(E) 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.

076.02 MEASUREMENTS. A licensee must perform measurements required by 180 NAC 7-076.01 according to written procedures established by the authorized medical physicist. The authorized medical physicist need not actually perform the spot-check measurements.

076.03 RESULTS. A licensee must have the authorized medical physicist review and sign the results of each spot-check within 15 days. The authorized medical physicist must notify the licensee within 10 days in writing of the results of each spot-check.

076.04 SAFETY SPOT-CHECKS. A licensee authorized to use a teletherapy unit for medical use must perform safety spot-checks of each teletherapy facility once in each calendar month and after each source installation to assure proper operation of:

(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 source housing angulation or elevation, carriage or stand travel and operation of the beam on-off mechanism;

(C) 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.

076.05 SYSTEM MALFUNCTION. If the results of the checks required in 180 NAC 7-076.02 and 7-076.04 indicate the malfunction of any system, a licensee must lock the control console in the off position and not use the unit other than as necessary to repair, replace, or check the malfunctioning system.

076.06 RECORDS. A licensee must retain a record of each spot-check required by 180 NAC 7-076.01 and 7-076.04 and according to 180 NAC 7-109.

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