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(In comparison, my little hormone vials, here in my above-ground lab, have a background count of about 25 counts per minute for 3.5 milliliters.) So, the physicists want to find fossil fuels that have very little C.

Apparently it correlates best with the content of the natural radioactivity of the rocks surrounding the fossil fuels, particularly the neutron- and alpha-particle-emitting isotopes of the uranium-thorium series. Gove and his colleagues told me they think the evidence so far demonstrates that C by local radioactive decay of the uranium-thorium series.

Presumably most of these bacteria never interact with the "modern" C.

Though this result is still too old to fit into any young-earth creationist chronology, it would also seem to represent a problem for the established geologic timescale, as conventional thought holds that coal deposits were largely if not entirely formed during the Carboniferous period approximately 300 million years ago. It turns out that the origin and concentration of C in fossil fuels is important to the physics community because of its relevance for detection of solar neutrinos. Apparently one of the new neutrino detectors, the Borexino detector in Italy, works by detecting tiny flashes of visible light produced by neutrinos passing through a huge subterranean vat of "scintillation fluid". Scintillation fluid is made from fossil fuels such as methane or oil (plus some other ingredients), and it sparkles when struck by beta particles or certain other events such as neutrinos. However, if there are any native beta emitters in the fluid itself, that natural radioactive decay will also produce scintillant flashes. (In fact that's the more common use of scintillant. So, it looks like in-situ production of new C is the best-supported hypothesis; but research is ongoing, and I look forward to seeing the results of the Old Carbon Project and new research on the deep subterranean bacteria. Recent references from the ongoing "Old Carbon Project": "The measurement of very old Radiocarbon ages by AMS." 2001.