Hi Sterling, Rob, Chris, all -
Even Tunguska (now estimated at somewhere between 5 to 15 megatons) threw off
enough high energy (infra-red) photons to set the trees on fire for miles
around. Now some of those photons would not have been directed outward, but
instead have hit other nearby atoms already at high energy states from being
hit previously with other high energy photons.
If enough energy accumulated, then perhaps when some of the photons were
finally thrown off, they were at a high enough energy level that neutron
spallation occurred.
This would all be blue sky, but for those 14C spikes... Chris, I think I got
the copy of the INTCAL98 chart from one of Firestone's papers. Stuiver and
Volcker (working with Iceland marine data) were cited as the data sources.
Firestone did not create the INTCAL98 chart. The bumps around 10,900 BCE were
what set Firestone off on his search to find their source, which led him at
first to a nearby supernova and finally to impact.
E.P. Grondine
Man and Impact in the Americas
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