Because of this alert I actually learned that Ontario Power Generation and the city of Toronto offer free Potassium Iodine pills to anyone living within 50km of the reactor in case of a radiation leak: https://preparetobesafe.ca
> How many pills should I have on hand? > Each adult in the household should have 4 pills available, and each child should have two pills available. This is enough for 2 days supply. Is this enough? The radioactive half life of I-?131? is 8 days. Or is the dose so high that you won't uptake any from the environment for a while?
There is more info available here:
https://www.nrc.gov/about-nrc/emerg-preparedness/about-emerg...
and here, about dosing: (pdf warning)