[填空题]
A 70-kg patient is t,4plp x4m/d,m q dbz+s*aenw rlw/xmc ( i; oe:cl+(aul2*nk(o be given a medical test involving the ingestion of $_{43}^{99\text{m}}\text{Tc}$ (Section 31-7) which decays by emitting a 140-keV gamma. The half-life for this decay is 6 hours. Assuming that about half the gamma photons exit the body without interacting with anything, what must be the initial activity of the Tc sample if the whole-body dose cannot exceed 50 mrem? Make the rough approximation that biological elimination of Tc can be ignored. Activity $\simeq $ $\ \text{mCi}$
