The Mystery Of Radioactive Rain In Brazil?

It's no mystery.  It's called atmospheric washout.  But that doesn't stop Dr. Chris Busby from solving what is already well known:

Of course, he could simply place a sample on a spectrometer and see exactly what's in it, but that wouldn't allow him to express his "expertise".  And as far as rainwater causing diarrhea and flu-like symptoms...why isn't anyone complaining of such during rain showers?

Completely bogus, Chief Inspector.