DHS 157.67(4)
(4)
Safety procedures and instructions for remote afterloader, teletherapy and gamma stereotactic radiosurgery units. DHS 157.67(4)(a)1.
1. Secure the unit, console, console keys and the treatment room when unattended or not in use.
DHS 157.67(4)(a)2.
2. Permit only individuals approved by the authorized user, radiation safety officer or authorized medical physicist to be present in the treatment room during treatment with the source.
DHS 157.67(4)(a)3.
3. Prevent dual operation of more than one radiation producing device in a treatment room, if applicable.
DHS 157.67(4)(a)4.
4. Develop, implement and maintain written procedures for responding to an abnormal situation when the operator is unable to place the source in the shielded position or remove the patient or human research subject from the radiation field with controls from outside the treatment room. The procedure shall include all the following:
DHS 157.67(4)(a)4.a.
a. Instructions for responding to equipment failures and the names of the persons responsible for implementing corrective actions.
DHS 157.67(4)(a)4.b.
b. The process for restricting access to and posting signs in the proximity of the treatment area to minimize the risk of inadvertent exposure.
DHS 157.67(4)(a)4.c.
c. The names and telephone numbers of the authorized users, the authorized medical physicist and the radiation safety officer to be contacted if the unit or console operates abnormally.
DHS 157.67(4)(b)
(b) A copy of the procedures required by par.
(a) 4. shall be physically located at the unit console.
DHS 157.67(4)(c)
(c) A licensee shall post instructions at the unit console to inform the operator of both of the following:
DHS 157.67(4)(c)2.
2. The names and telephone numbers of the authorized users, the authorized medical physicist and the radiation safety officer to be contacted if the unit or console operates abnormally.
DHS 157.67(4)(d)
(d) A licensee shall provide operational and safety instruction, initially and at least annually, at intervals not to exceed 13 months, to all persons who operate the unit, as appropriate to the person's assigned duties, in all of the following:
DHS 157.67(4)(e)
(e) A licensee shall ensure that operators, authorized medical physicists and authorized users participate in drills of the emergency procedures, initially and at least annually, at intervals not to exceed 13 months, thereafter.
DHS 157.67(4)(g)
(g) Prior to the first use for patient treatment of a new unit or an existing unit with a manufacturer upgrade that affects the operation and safety of the unit, a licensee shall ensure that vendor operational and safety training is provided to all individuals who will operate the unit. The vendor operational and safety training must be provided by the device manufacturer or by an individual certified by the device manufacturer to provide the operational and safety training.
DHS 157.67(4)(h)
(h) A licensee shall retain a copy of the procedures required by pars.
(a) 4. and
(d) 2. until the licensee no longer possesses the remote afterloader, teletherapy unit, or gamma stereotactic radiosurgery unit.
DHS 157.67(5)
(5)
Safety precautions for remote afterloader, teletherapy and gamma stereotactic radiosurgery units. DHS 157.67(5)(a)(a) A licensee shall control access to the treatment room by a door at each entrance.
DHS 157.67(5)(b)
(b) A licensee shall equip each entrance to the treatment room with an electrical interlock system that accomplishes all the following:
DHS 157.67(5)(b)1.
1. Prevents the operator from initiating the treatment cycle unless each treatment room entrance door is closed.
DHS 157.67(5)(b)2.
2. Causes the source to be shielded promptly when an entrance door is opened.
DHS 157.67(5)(b)3.
3. Prevents the source from being exposed following an interlock interruption until all treatment room entrance doors are closed and the source on-off control is reset at the console.
DHS 157.67(5)(c)
(c) A licensee shall require any person entering the treatment room to assure, via appropriate radiation monitors, that radiation levels have returned to ambient levels.
DHS 157.67(5)(d)
(d) Except for low-dose remote afterloader units, a licensee shall construct or equip each treatment room with viewing and intercom systems to permit continuous observation of the patient or the human research subject from the treatment console during irradiation.
DHS 157.67(5)(e)
(e) For licensed activities where sources are placed within the patient's or human research subject's body, a licensee shall only conduct treatments that allow for expeditious removal of a decoupled or jammed source.
DHS 157.67(5)(f)1.
1. For medium dose-rate and pulsed dose-rate remote afterloader units, require all the following:
DHS 157.67(5)(f)1.a.
a. An authorized medical physicist and either an authorized user or a physician, under the supervision of an authorized user, who has been trained in the operation and emergency response for the unit to be physically present during the initiation of all patient treatments involving the unit.
DHS 157.67(5)(f)1.b.
b. An authorized medical physicist and either an authorized user or a person under the supervision of an authorized user who has been trained to remove the source applicator in the event of an emergency involving the unit to be immediately available during continuation of all patient treatments involving the unit.
DHS 157.67(5)(f)2.
2. For high dose-rate remote afterloader units, require all the following:
DHS 157.67(5)(f)2.a.
a. An authorized user and an authorized medical physicist to be physically present during the initiation of all patient treatments involving the unit.
DHS 157.67(5)(f)2.b.
b. An authorized medical physicist and either an authorized user or a physician, under the supervision of an authorized user, who has been trained in the operation and emergency response for the unit to be physically present during continuation of all patient treatments involving the unit.
DHS 157.67(5)(f)3.
3. For gamma stereotactic radiosurgery units, require an authorized user and an authorized medical physicist to be physically present throughout all patient treatments involving the unit.
DHS 157.67(5)(f)4.
4. Notify the radiation safety officer or his or her designee and an authorized user immediately if the patient or human research subject has a medical emergency or if the patient dies.
DHS 157.67(5)(g)
(g) A licensee shall have available near each treatment room, emergency response equipment, as applicable, to respond to all of the following:
DHS 157.67(5)(g)2.
2. A source inadvertently lodged within the patient following completion of the treatment.
DHS 157.67(6)(a)(a) Except for low dose-rate remote afterloader sources where the source output or activity is determined by the manufacturer, a licensee shall have a calibrated dosimetry system available for use. To satisfy this requirement, one of the following conditions shall be met:
DHS 157.67(6)(a)1.
1. The system shall have been calibrated using a system or source traceable to the national institute of standards and technology and published protocols accepted by nationally recognized bodies, or by a calibration laboratory accredited by the American association of physicists in medicine. The calibration shall have been performed within the previous 2 years and after any servicing that may have affected system calibration.
DHS 157.67 Note
Note: An example of a nationally recognized body is the American Association of Physicists in Medicine.
DHS 157.67(6)(a)2.
2. The system shall have been calibrated within the previous 4 years. Eighteen to 30 months after that calibration, the system shall have been compared to another dosimetry system that was calibrated within the past 24 months by the national institute of standards and technology or by a calibration laboratory accredited by the American association of physicists in medicine. The results of the comparison shall have indicated that the calibration factor of the licensee's system had not changed by more than 2%. A licensee may not use the intercomparison result to change the calibration factor. When comparing dosimetry systems to be used for calibrating sealed sources for therapeutic units, a licensee shall use a comparable unit with beam attenuators or collimators, as applicable, and sources of the same radionuclide as the source used at the licensee's facility.
DHS 157.67(6)(b)
(b) A licensee shall have available for use a dosimetry system for spot-check output measurements to periodically measure the radiation output of the device for consistency, if applicable. To satisfy this requirement, the system may be compared with a system that has been calibrated under par.
(a). The comparison shall have been performed within the previous 12 months and after each servicing that may have affected system calibration. The spot-check system may be the same system used to meet the requirement in par.
(a).
DHS 157.67(7)
(7)
Full calibration measurements on teletherapy units. DHS 157.67(7)(a)(a) A licensee authorized to use a teletherapy unit for medical use shall perform full calibration measurements on each teletherapy unit under any of the following circumstances:
DHS 157.67(7)(a)2.a.
a. Whenever spot-check measurements indicate that the output differs by more than 5% from the output obtained at the last full calibration corrected mathematically for radioactive decay.
DHS 157.67(7)(a)2.b.
b. Following replacement of the source or following reinstallation of the teletherapy unit in a new location.
DHS 157.67(7)(a)2.c.
c. Following any repair of the teletherapy unit that includes removal of the source or major repair of the components associated with the source exposure assembly.
DHS 157.67(7)(b)
(b) To satisfy the requirements of par.
(a), full calibration measurements shall include determination of all of the following:
DHS 157.67(7)(b)1.
1. The output within plus or minus 3% for the range of field sizes and for the distance or range of distances used for medical use.
DHS 157.67(7)(b)2.
2. The coincidence of the radiation field and the field indicated by the light beam localizing device.
DHS 157.67(7)(b)3.
3. The uniformity of the radiation field and its dependence on the orientation of the useful beam.
DHS 157.67(7)(b)6.
6. The accuracy of all distance measuring and localization devices in medical use.
DHS 157.67(7)(c)
(c) A licensee shall use the dosimetry system described in sub.
(6) (a) to measure the output for one set of exposure conditions. The remaining radiation measurements required in par.
(b) may be made using a dosimetry system that indicates relative dose rates.
DHS 157.67(7)(d)
(d) A licensee shall perform a full calibration required by par.
(a) under published protocols accepted by nationally recognized bodies.
DHS 157.67 Note
Note: An example of such a nationally recognized body is the American Association of Physicists in Medicine.
DHS 157.67(7)(e)
(e) A licensee shall mathematically correct the outputs determined in par.
(b) 1. for physical decay for intervals not exceeding one month for cobalt-60, 6 months for cesium-137 or at intervals consistent with one percent decay for all other nuclides.
DHS 157.67(7)(f)
(f) Full calibration measurements required by par.
(a) and physical decay corrections required by par.
(e) shall be performed by an
authorized medical physicist.
DHS 157.67(8)
(8)
Full calibration measurements on remote afterloader units. DHS 157.67(8)(a)(a) A licensee authorized to use a remote afterloader unit for medical use shall perform a full calibration measurement on each unit under any of the following circumstances:
DHS 157.67(8)(a)2.a.
a. Following replacement of any source or following reinstallation of the unit in a new location outside the facility.
DHS 157.67(8)(a)2.b.
b. Following any repair of the unit that includes removal of the source or major repair of the components associated with the source exposure assembly.
DHS 157.67(8)(a)3.
3. Each calendar quarter, at intervals not exceeding 100 days for high dose-rate, medium dose-rate and pulsed dose-rate remote afterloader units with sources whose half-life exceeds 75 days.
DHS 157.67(8)(a)4.
4. At intervals not exceeding one year for low dose-rate remote afterloader units.
DHS 157.67(8)(b)
(b) To satisfy the requirement of par.
(a), a full calibration measurement shall include, as applicable, determination of all the following:
DHS 157.67(8)(b)7.
7. Function of the source transfer tubes, applicators and transfer tube-applicator interfaces.
DHS 157.67(8)(c)
(c) In addition to the requirement for full calibration for low dose-rate remote afterloader units in par.
(b), a licensee shall perform an autoradiograph of the source to verify inventory and source arrangement at intervals not exceeding one calendar quarter.
DHS 157.67(8)(e)
(e) A licensee shall make a full calibration measurement required by par.
(a) under published protocols accepted by nationally recognized bodies.
DHS 157.67(8)(f)
(f) For low dose-rate remote afterloader units, a licensee may use measurements provided by the source manufacturer that are made under pars.
(a) to
(e).
