Hi Doug, all -
Becker and Poreda's work with 3He in fullerenes at the PT boundary has never
been duplicated in any lab. I don't know why this is, but I have a question: Is
3He a cometary marker?
This should be an easy question to answer, simply by grabbing dust samples
during any meteor shower and analyzing them.
I also wonder about 3He capture when a Long Period Comet becomes a Short Period
Comet. It would seem to me that if it were in the inner solar system long
enough before accreting with another body (say 6 or 7 million years or so),
then the comet would accumulate 3He from the Sun, particularly on close passes
near to it.
E.P. Grondine
Man and Impact in the Americas
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