wrwy
The more radioactive something is, the shorter its half life. Contrary to movie drama, the really scary radiation is fairly short-lived. After that the risk is ingesting the lingering, long-lived alpha and beta emitters contaminating food and water. Just the same, still a bad idea to build playgrounds on ground zero sites.
She's on the phone with someone who's conversations she doesn't wish to continue in the presence of those inside. Or, it's just a bad scene in the house and she's getting up the courage to go and face it once more into the breech.