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

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Physics

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 5cm x 5cm beam. Compute the maximum dose receivedanywhere in the patients anatomy.

b)At what depth does the maximum occur? Explain

c) compute the dose at a depth of 5 cm along the beam axis

d) Would this be a good strategy? Explain

percent dose (in %) table for Co-60 beam for different depthsand field sizes

Field size (cm^2)5x510x1020x20
Depth (cm)
0.5100100100
5.076.780.483.0
10.053.358.763.3

Answer & Explanation Solved by verified expert
4.1 Ratings (544 Votes)
solution 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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