LINEAR ACCELERATOR EMERGENCY AND SAFETY
PROCEDURES
True Beam
Department
SOP No: 46
Chapter: TrueBeam-RT
Radiation Oncology
Version: 2
Page 1 of 3
Policy:
To provide guide lines to adhere to regulations and provide a safe
environment. Prior to Operating the accelerator, the operators will
know the location of emergency switches and Main circuit breakers.
"EMERGENCY OFF” buttons are located on the console, on the
Modulator, and the walls in the treatment room. The EMERGENCY
OFF buttons control both the beam and the motors driving the
mechanical movement of the couch and the Gantry.
Procedure:
A. Treatment Beam Fails to Terminate:
1. Immediately press the BEAM OFF button and turn the
DISABLE/ENABLE key switch tothe DISABLE position.
2. If the beam remains on, press the nearest EMERGENCY OFF button.
3. If the beam still remains on, turn off the circuit breaker near the console.
4. Remove the patient from the couch.
5. Check the backup counter and document the cumulative number of monitor
units delivered.
6. Notify physics/engineer AND do not attempt to operate the
Unique until Physics/engineerreleases the unit for clinical use.
7. Document service call and error in logbook, and daily warm up sheet.
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LINEAR ACCELERATOR EMERGENCY AND SAFETY
PROCEDURES
True Beam
Department
SOP No: 46
Chapter: TrueBeam-RT
Radiation Oncology
Version: 2
Page 2 of 3
B. Power Failure AND Equipment Malfunction:
1. Terminate the beam if applicable.
2. Remove the patient from the couch.
3. Record the backup counter reading at the time of failure.
4. Deliver the remaining monitor units.
5. Notify physics.
C. Electrical Fire:
1. Depress the nearest EMERGENCY OFF button.
2. Turn off the main circuit breaker and contact Maintenance.
3. Remove the patient from the couch.
4. Initiate Safety procedures for f ire during working hours.
5. Call the engineer.
6. Record the entered treatment monitor units.
7. Calculate the remaining monitor units.
8. Notify physics.
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LINEAR ACCELERATOR EMERGENCY AND SAFETY
PROCEDURES
True Beam
Department
SOP No: 46
Chapter: TrueBeam-RT
Radiation Oncology
Version: 2
Page 3 of 3
D. Accidental Radiation Exposure:
In the event a person is accidentally exposed or thought to be
exposed to radiation, notify theMedical Physicist or Radiation
Safety Officer (RSO) immediately.
E. Patient Support Assembly (PSA) Life Mechanism Failure:
Should the PSA fail to lower upon command from the pendant
control when a patient is onthe PSA, perform the following
procedures?
1. Verify that no emergency buttons have accidentally been
pushed. They should all be pulledout.
2. Reset motors, if couch will not lower, reboot linac.
3. If the PSA still does not lower, contact engineer.
4. Remove patient by raising stretcher, assisting the patient over to
the stretcher, and loweringthe stretcher.
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