Sounds like MH was hit hard by detox. Iodine is also not a heavy metal. Is his kid autistic?
Iodine is safe, but the detox may not be. But for the purpose of dealing with fallout, potassium iodide is what you want. The elemental iodine in Lugol's causes oxidative stress, which is what most people have problems with in the beginning. Also, if you peruse the threads below this one, you'll find dosage and other info.
It's hoped that you use this chance to look beyond a theoretical fallout and consider iodine supplementation in general for your family. But not before you study everything about it. The FAQs would be a good starting point.
Unfortunately, if fallout from the Japan incident somehow reached you (Montreal?) at a significant level, I'm afraid it won't stop you and your family from this fate.. http://www.youtube.com/watch?v=tjEdLuqK1RQ
But their thyroids should be alright. :)