Keeping Potassium Iodide (K1 pills) on hand is also helpful. Affordable too.

The key is having always available no matter where your are so keep a bottle at home, in your vehicles glove box and even your bag or purse.

In the event of significant radiation exposure, the first dose needs to be taken as soon as you realize you're exposed. Continued timed doses is important too to prevent thyroid damage and any other subsequent exposure that can create long term irreversible damage.