Government Under Fire as Radiation Is Found in Milk, Rain

Pretty sure cow cancer doesn't concern me much. If the Iodine-131 was specifically stated in the article to be expected to have broken down by the 9th day, what is the point of freaking out? Even if it does go into the cows and eventually the milk, I'm sure it'll be long after the radionuclides have lost all its radiation when we consume any of that milk.