[meteorite-list] Concerning Eath originating meteorites
From: Kelly Webb <kelly_at_meteoritecentral.com>
Date: Thu Apr 22 09:42:02 2004
> I was down with the Antarctic Search for Meteorites team. The team always
> picks up any unusual rock, even if they aren't sure it is a meteorite. A
> terrestrial meteorite would be collected as long as there was some unusual
> property associated with it, such as fusion crust or visible shock damage.
> Indeed, two years age they returned two samples that turned out to be just
> unusual mudstones. Counting in a low-level gamma-ray counting facility
> showed that these samples contained no radioactivity caused by exposure to
> cosmic-rays in space, and thus the rocks were never in space.
The extent of evidence of cosmic ray exposure would depend on the duration
of the extraterrestrial exposure time. Times of less than perhaps ten thousand
years would be essentially undetectable.
Received on Sun 21 Jan 2001 11:30:44 PM PST