[填空题]
Assume a liter of mildf5)n55 dgai rzq,x,iq z e5*nk tc/x hp*odw *c:ypically has an activity of 2000 pCi due to $_{19}^{40}\text{K}$. If a person drinks two glasses (0.5 L) per day, estimate the total effective dose (in Sv and in rem) received in a year. As a crude model, assume the milk stays in the stomach 12 hr and is then released. Assume also that very roughly 10% of the 1.5 MeV released per decay is absorbed by the body. Compare your result to the normal allowed dose of 100 mrem per year. Make your estimate for
(a) a 50-kg adult, $\approx$ $ \times 10^{-7}\ \text{Sv/year}$ $\approx $ $ \times 10^{-5}\ \text{rem/year}$ $\approx $ $ \times 10^{-4}$ times the allowed dose
(b) a 5-kg baby. $\times 10^{-4}\ \text{Sv}$ $\times 10^{-4}\ \text{rem}$ $ \times 10^{-4}\ \text{times the allowed dose}$
