Bone cancer has been diagnosed for a patient and the decision has been made to use radiation therapy to attempt to eradicate the cancerous cells. "Sr is used for the treatment, which involves putting a 3.6 x 10'mCi source of "Sr in the immediate neighborhood of the cancer, positioned so that 90% of the beta emissions (0.546 MeV per decay) hit the region and 30% are absorbed by the region that has a mass of 2.5 kg. A series of treatments, totaling 12 minutes is done. a. What is the dose in rems that the cancerous tissue has received? (4 marks) b. Given that this is a cancer therapy treatment, what effect should this dose have on the cells? (1 mark)