# 6a) A tumor located at the depth of 10cm is treated using a non-isocentric technique with...

###### Question:

6a) A tumor located at the depth of 10cm is treated using a non-isocentric technique with a Co60 machine, to a dose of 1.8 Gy, with a single 5cm x 5cm beam. Compute the maximum dose received anywhere in the patient's anatomy. Refer to the attached table for PDD data.
b) At what depth does the maximum dose occur? Explain.
c) Compute the dose at a depth of 5ccm along the beam axis.
d) Would this be a good treatment strategy? Explain.

Attached Table:

 Field Size (cm2) 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

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