The animals were then sacrificed every 12 hr, and chlorine-36 tissue levels determined.
Molecules containing Chlorine-36 is rapidly eliminated from liver and kidneys, the residue levels reaching that of the other tissues after 36 hr.
Tritium, an isotope of hydrogen, and chlorine-36
were also both absent from the Naimona'nyi cores, according to Natalie Kehrwald, a doctoral student at Ohio State and lead author on the paper.
At the same time, the team monitored a chlorine-36
Of these, most will be trapped by the clay buffer, and only two are likely to migrate very far: chlorine-36
It is surprising that Phillips did not attempt this, as it would have provided relevant data on the depth dependence of chlorine-36 concentrations.
Chlorine-36 in nature, Annals of the New York Academy of Science 62: 105-22.
Measurements of chlorine-36 in Coa valley schists assume that this isotope only begins to accumulate once a rock panel becomes exposed to the atmosphere and to cosmic rays.
Generally, measuring the amount of chlorine-36 in a sample taken from an exposed rock surface today indicates the sum of isotopic contributions from atmospheric, cosmogenic and radioactive sources, assuming that chlorine-36 was not introduced either by prior exposure or from groundwater.
, says Sweetkind, comes from above-ground nuclear weapons tests conducted in the 1950s and 1960s.
dating has important potential for archaeology, but recent Chlorine-36
dates on `bluestones' of Stonehenge have been misinterpreted.
Therefore, it is possible to tell how long a rock has been at the surface by measuring its chlorine-36
content, says Fred M.