Jonathan Silverlight wrote:

I wonder if the NGL people at ETH Zurich have taken into
account that their meteorites were a bit larger before they
encountered Earth's atmosphere. There may have been
significantly greater amounts of noble gas in the original
fragments which also might mean significantly longer travel
time.

But the inside of a meteorite isn't heated by passage through the
atmosphere. It's too quick. I'm sure they would avoid the outer parts
and the fusion crust.

How penetrating are the cosmic rays? If most of them stop in the outer
surface then you'd find higher concentrations of the Noble gas in the
shell of the meteorite that gets burned off.

--
Hop David
http://clowder.net/hop/index.html