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

90.2K

Verified Solution

Question

Physics

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. (5 pts) b) Compute the dose at a depth of 5 cm along thebeam axis. (5 pts) c) Would this be a good treatment strategy?Explain. (5 pts)

Answer & Explanation Solved by verified expert

4.1 Ratings (817 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

Get Answers to Unlimited Questions

Join us to gain access to millions of questions and expert answers. Enjoy exclusive benefits tailored just for you!

Membership Benefits:

Unlimited Question Access with detailed Answers
Zin AI - 3 Million Words
10 Dall-E 3 Images
20 Plot Generations
Conversation with Dialogue Memory
No Ads, Ever!
Access to Our Best AI Platform: Flex AI - Your personal assistant for all your inquiries!

Become a Member