a) A tumour located at a depth of 10 cm is treated using anon-isocentic technique with a Co-60 machine, to a dose of 1.8 Gy,with a single 5 cm x 5 cm beam. Compute the maximum dose receivedanywhere in the patient's anatomy. Refer to the attached table forPDD data. (5 pts)
b) At what depth does the maximum dose occur? Explain. (5pts)
c) Compute the dose at a depth of 5 cm along the beam axis. (5pts)
d) Would this be a good treatment strategy? Explain.
Percent Depth dose (in %) table for Co-60 beam for differentdepths and field sizes.
| Field Size (cm^2) | 5 x 5 | 10 x 10 | 20 x 20 |
| Depth (cm) | | | | |
| 0.5 | | 100 | 100 | 100 |
| 5.0 | | 76.7 | 80.4 | 83.0 |
| 10.0 | | 53.3 | 58.7 | 63.3 |
