fear_not,
I agree, we should stop and avoid a scientific discussion here ... by chance I work in physics as well. I have a PhD in semiconductor physics which is not nuclear physics as well.
Just one more comment, most of the muons are not yet decayed at altitude because of Einstein's time dilatation. So my estimate is that most ionizing particles are still present and gamma radiation is negligile, also because of their low ionization. But I need to do some reading here...
EoD