Annually Flashcards
1
Q
Field size indication at extended SSD
A
3 mm at 150 cm
2
Q
Verification of water flow and other interlocks
A
Functional
3
Q
Couch deflection under load
A
5 mm/ 0.5 degrees
4
Q
High dose rate interlock
A
Functional
5
Q
Definitive isocentre check
A
2 mm diameter
6
Q
Energy check using dose ratio at different angles
A
Ratio +/- 1%
7
Q
Flatness and symmetry full scans at all gantry angles
A
+/- 2%
8
Q
Flatness and symmetry variation with dose rate
A
+/- 2%
9
Q
Flatness interlocks
A
2% of intended
10
Q
Linearity of dosimetry system
A
1%
11
Q
Reproducibility of dosimetry system
A
0.5%
12
Q
Annual output calibration check
A
+/- 1%
13
Q
Backup dosemeter and timer (not set by user) interlocks
A
Functional
14
Q
Plotting tank measurements of depth dose and profiles (subset)
A
> 2% change
15
Q
Calibration of flatness monitor
A
2% of intended
