The main focus of this new CRP will be the implementation of several isotope hydrology assessments of deep/large aquifer systems using long-lived radionuclides, isotope age tracers and noble gases (carbon-14, krypton-81, chlorine-36
, helium-4, etc).
For this particular study, researchers measured decay rates of silicon-32 and chlorine-36
at Brookhaven National Laboratory (BNL) in New York.
Carbon-14, beryllium-10, aluminum-26, and chlorine-36
are also mentioned.
7 million years; chlorine-36
, with a half-life of about 300,000 years; and many other isotopes with half-live exceeding 30 years.
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
The accumulation of cosmogenic chlorine-36
in rocks: A method for surface exposure dating.
, says Sweetkind, comes from above-ground nuclear weapons tests conducted in the 1950s and 1960s.
Therefore, it is possible to tell how long a rock has been at the surface by measuring its chlorine-36
content, says Fred M.