[填空题]
A cancer patient is undergoing radiation therapy in which protons witte3j /x,p wib3h an enu vcg) 2s/eutl.g/ck:ergy of 1.2 MeV are incident on a 0.25-kg tuel:.uvc /cs tkug)/g 2mor.
(a) If the patient receives an effective dose of 1.0 rem, what is the absorbed dose?
(b) How many protons are absorbed by the tumor? Assume $QF = 1$. $ \times 10^{10}\ \text{p}$
