Subject: Does thick glass block damaging radiation?

The reason I ask this question is that I was reading an anecdote of
Feynmann's when the atomic bomb was being tested, that he climbed into
a car and watched the explosion through the glass -- because, as he said,
visible light will never hurt your eyes and the glass blocks the harmfull
stuff pretty well.  He said it slightly differently, but I don't think I'm
confused in my interpretation.  So, I guess glass blocks some radiation,
but what kinds?  How much?  Astronomers don't seem to be keen on looking at
the sun through clear glass like a car window's =)

Re: Does thick glass block damaging radiation?