A tumour located at a depth of 10cm is treated using a non-isocentric technique with a...

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Physics

A tumour located at a depth of 10cm is treated using anon-isocentric technique with a Co-60 machine, to a dose of 1.8 Gy,with a single 5cmx5cm beam.
a) Compute the maximum dose received anywhere in the patientsanatomy. Refer to the attached table for PDD data.
B) at what depth does the maximum dose occur? Explain
c) computer the dose at a depth of 5 cm along the beam axis.
d)would this be a good treatment strategy
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4.4 Ratings (842 Votes)

aAttached Table Field Size in cm2 5 x 5 10 x 10 20 x 20 Depth in cm 05 100 100 100 501 7672 8040 832 100 536 5874 6338 this a table of PDD data bCobalt 60 is produced in a nuclear reactor by bombarding 59Co with neutrons It has a half life of 53 years and decays by negative beta emission to metastable 60Ni This rapidly releases a gamma ray of either 117 or 133 MeV to reach a stable stateThe source typically has an activity of 185 370 MBq giving a dose rate at 80 cm of 1 2 Gyminute The Cobalt 60 source is usually replaced before a single half life has elapsed cThe source is See Answer

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