Dating a fossil carbon 14
(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.
The aim is to find fossil fuels that have a or less; below that, neutrino activity can be reliably detected.
The Borexino detector, and other planned detectors of this type, must keep native beta emissions to below 1 count per ton of fluid per week to reliably detect solar neutrinos.
Gove wrote back the very next day, as did one of his colleagues.
The team will be presenting results to date this September at the 9th International Conference on Accelerator Mass Spectrometry in Japan.) Finally, I did also get a copy of David Lowe's 1989 Radiocarbon paper. A summary: (1) old coal often has a little more C by radioactive decay.
I picked him to bother with my emails because he had recently written some nice review articles about the AMS technique in the Radiocarbon journal.
(Basically there are two ways of measuring C: (1) count the radioactive emissions, or, (2) a newer method, based on separating out the different carbon isotopes by their different masses via accelerator mass spectrometry [AMS] and counting the atoms themselves.) Dr.
Presumably most of these bacteria never interact with the "modern" C.
(4) Lowe goes on to make recommendations about using only freshly mined dry coal stored under inert gas, and other recommendations about choice of "background" for radiocarbon labs.
on the Applications of Accelerators in Research and Industry, J.