Answer
a) 1 mCi
b) 1000 mrem
Work Step by Step
We use stoichiometry to obtain:
a) $50.0 kg\times(20. mcCi\div1 kg)\times(1 mCi\div1000 mcCi)$
= 1 mCi technetium-99m
b) mrem = mrad x factor, where the factor is based on the type of radiation. The factor for alpha radiation is 20.
$50 mrad\times20$ = 1000 mrem