[填空题]
A cancer patient is undergoing radiation therapoy6dbjy+*aib+ w* 81qm5ma7fnvmv ;w y in which protons wiczt+5 g otl dw83x97ft;aukr8z- e0hdth an energy of 1.2 MeV are incident on a 0.25- edzlt+z-; 08 cr7f x58hgkt 93ouadwtkg tumor.
(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}$