Question

a 60 Co y-ray source used in radiation therapy has an activity of 5*10^9 Bq. the half life if 69 Co id 5.36 years.

a.) what is the mass if the 60 Co in the source?

b) this source is used to deliver radiation to a .2 kg tumor. it is placed so that 50% of the radiation from the source is absorbed by the tumor. each decay delivers an average of 1.2MeV of energy. the treatment lasts for 10 min. what dose equivalent is deivered from the tumor?(RBE for y-rays is 1)

Answer 1