DHS 157.67(10)(a)6.
6. The difference between the measurement made in this subd.
5. and the anticipated output expressed as a percentage of the anticipated output, which is the value obtained at last full calibration corrected mathematically for physical decay.
DHS 157.67(10)(b)
(b) A licensee shall perform measurements required by par.
(a) under procedures established by the authorized medical physicist. The authorized medical physicist need not actually perform the spot check measurements.
DHS 157.67(10)(c)
(c) A licensee shall have the authorized medical physicist review the results of each spot-check within 15 working days. The authorized medical physicist shall notify the licensee in writing of the results of each spot-check within 10 working days.
DHS 157.67(10)(d)
(d) A licensee authorized to use a teletherapy unit for medical use shall perform safety spot-checks of each teletherapy facility once in each calendar month and after each source installation to assure proper operation of all of the following:
DHS 157.67(10)(d)2.
2. Electrical or mechanical stops installed to limit use of the primary beam of radiation.
DHS 157.67 Note
Note: Examples of the limitations in subd. 2. include restriction of source housing angulation or elevation, carriage or stand travel and operation of the beam on-off mechanism.
DHS 157.67(10)(d)3.
3. Source exposure indicator lights on the teletherapy unit, on the control console and in the facility.
DHS 157.67(10)(d)6.
6. Electrically assisted treatment room doors with the teletherapy unit electrical power turned off.
DHS 157.67(10)(e)
(e) If the results of the checks required in par.
(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.
DHS 157.67(11)
(11)
Periodic spot-checks for remote afterloader units. DHS 157.67(11)(a)(a) A licensee authorized to use remote afterloader units for medical use shall perform a spot-check of each remote afterloader facility and on each unit according to the following criteria:
DHS 157.67(11)(a)1.
1. At the beginning of each day of use of a high dose-rate, medium dose-rate or pulsed dose-rate remote afterloader unit.
DHS 157.67(11)(a)2.
2. Prior to each patient treatment with a low dose-rate remote afterloader unit.
DHS 157.67(11)(b)
(b) A licensee shall have an authorized medical physicist establish written procedures for performing the spot-checks required in par.
(a) of this section. The authorized medical physicist need not actually perform the spot check measurements.
DHS 157.67(11)(c)
(c) To satisfy the requirements of par.
(a), a spot-check shall assure proper operation of all of the following:
DHS 157.67(11)(c)2.
2. Source exposure indicator lights on the remote afterloader unit, on the control console and in the facility.
DHS 157.67(11)(c)3.
3. Viewing and intercom systems in each high dose-rate, medium dose-rate and pulsed dose-rate remote afterloader facility.
DHS 157.67(11)(d)
(d) If the results of the checks required in par.
(c) indicate the malfunction of any system, a licensee shall lock the control console in the off position and not use the unit except as necessary to repair, replace or check the malfunctioning system.
DHS 157.67(11)(f)
(f) A licensee shall have an authorized medical physicist review the results of each spot-check within 15 working days of the spot check. The authorized medical physicist shall notify the licensee as soon as possible in writing of the results of each spot-check.
DHS 157.67(12)
(12)
Periodic spot-checks for gamma stereotactic radiosurgery units. DHS 157.67(12)(a)(a) 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 at all of the following times:
DHS 157.67(12)(b)
(b) A licensee shall have an authorized medical physicist do all the following:
DHS 157.67(12)(b)2.
2. Review the results of each spot-check required by par.
(a) 1. within 15 working days of the check. The authorized medical physicist need not actually perform the spot-check measurements.
DHS 157.67(12)(b)3.
3. The authorized medical physicist shall notify the licensee as soon as possible in writing of the results of the spot check.
DHS 157.67(12)(c)1.
1. Assure proper operation of treatment table retraction mechanism, using backup battery power or hydraulic backups with the unit off; helmet microswitches; emergency timing circuits and stereotactic frames and localizing devices.
DHS 157.67(12)(c)2.a.
a. The output for one typical set of operating conditions measured with the dosimetry system described in sub.
(6) (b).
DHS 157.67(12)(c)2.b.
b. The difference between the measurement made in subd.
2. a. and the anticipated output expressed as a percentage of the anticipated output.
DHS 157.67(12)(d)
(d) To satisfy the requirements of par.
(a) 2. and
3., a spot-check shall assure proper operation of all of the following:
DHS 157.67(12)(d)1.
1. Electrical interlocks at each gamma stereotactic radiosurgery room entrance.
DHS 157.67(12)(d)2.
2. Source exposure indicator lights on the gamma stereotactic radiosurgery unit, on the control console and in the facility.
DHS 157.67(12)(e)
(e) A licensee shall arrange for prompt repair of any system identified in par.
(c) or
(d) that is not operating properly.
DHS 157.67(12)(f)
(f) If the results of the checks required in par.
(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.
DHS 157.67(13)
(13)
Additional technical requirements for mobile remote afterloader units. DHS 157.67(13)(a)
(a) A licensee providing mobile remote afterloader service shall do all of the following:
DHS 157.67(13)(a)1.
1. Check survey instruments before medical use at each client's address of use or on each day of use, whichever is more frequent.
DHS 157.67(13)(a)2.
2. Account for all sources before departure from a client's address of use.
DHS 157.67(13)(b)
(b) In addition to the periodic spot-checks required by sub.
(11), a licensee authorized to use mobile afterloaders for medical use shall perform checks on each remote afterloader unit before use at each address. A check shall be made to verify the operation of all the following:
DHS 157.67(13)(b)2.
2. Source exposure indicator lights on the remote afterloader unit, on the control console and in the facility.
DHS 157.67(13)(b)4.
4. Applicators, source transfer tubes and transfer tube-applicator interfaces.
DHS 157.67(13)(b)7.
7. Radiation monitors used to indicate whether the source has returned to a safe shielded position.
DHS 157.67(13)(c)
(c) A licensee shall ensure overall proper operation of the remote afterloader unit by conducting a simulated cycle of treatment before use at each address of use.
DHS 157.67(13)(d)
(d) If the results of the checks required in par.
(b) 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.
DHS 157.67(14)(a)(a) In addition to the survey requirement in s.
DHS 157.25 (1), a person licensed to possess or use photon emitting remote afterloader, teletherapy or gamma stereotactic radiosurgery units shall perform surveys of the device and ensure the results of the surveys from the surface of the main source safe, with the sources in the shielded position, do not exceed the maximum and average radiation levels listed in the sealed source and device registry.
DHS 157.67(14)(b)
(b) A licensee shall make the survey required by par.
(a) at installation of a new source and following repairs to source shielding, a source driving unit or other electronic or mechanical component that could expose a source, reduce the shielding around a source or compromise the radiation safety of the unit or a source.
DHS 157.67(15)
(15)
Full inspection for teletherapy and gamma stereotactic radiotherapy units. DHS 157.67(15)(a)
(a) A licensee shall have each teletherapy unit and gamma stereotactic radiosurgery unit inspected for proper operation and serviced during source replacement to assure proper functioning of the source exposure mechanism. The intervals between full inspection and servicing shall not to exceed 5 years for each teletherapy unit and shall not exceed 7 years for each gamma stereotactic radiosurgery unit.
DHS 157.67(15)(b)
(b) Inspection and servicing of a teletherapy or gamma stereotactic radiosurgery unit may only be performed by a person specifically licensed to do so by the department, the NRC or another agreement state.
DHS 157.67(16)
(16)
Therapy-related computer systems. A licensee shall perform acceptance testing on the treatment planning system under published protocols accepted by nationally recognized bodies. The acceptance testing shall include, as applicable, verification of all of the following:
DHS 157.67(16)(a)
(a) Source-specific input parameters required by the dose calculation algorithm used to calculate the dose to the patient.
DHS 157.67(16)(b)
(b) Accuracy of dose, dwell time of the radioactive source at a particular location and treatment time calculations at representative points.
DHS 157.67(16)(c)
(c) Accuracy of isodose graphic plots on paper and graphic displays.
DHS 157.67(16)(d)
(d) Accuracy of the software used to determine radioactive source positions from radiographic images.
DHS 157.67(16)(e)
(e) Accuracy of electronic transfer of the treatment delivery parameters to the treatment delivery unit from the treatment planning system that was used to calculate the patient dose and radioactive source dwell times.
DHS 157.67 Note
Note: An example of such a nationally recognized body is the American Association of Physicists in Medicine.
