Uncertainties are given in concise form in parentheses after the corresponding last digits.Spins with weak assignment arguments are enclosed in parentheses. Values marked # are not purely derived from experimental data, but at least partly from systematic trends.Substantial deviations from the given mass and composition can occur. Commercially available materials may have been subjected to an undisclosed or inadvertent isotopic fractionation.The uncertainty in the atomic mass may exceed the stated value for such specimens. Geologically exceptional samples are known in which the isotopic composition lies outside the reported range.36Cl has seen use in other areas of the geological sciences, including dating ice and sediments. Thus, as an event marker of 1950s water in soil and ground water, 36Cl is also useful for dating waters less than 50 years before the present. ![]() The residence time of 36Cl in the atmosphere is about 1 week. Additionally, large amounts of 36Cl were produced by irradiation of seawater during atmospheric detonations of nuclear weapons between 19. The half-life of this hydrophilic nonreactive isotope makes it suitable for geologic dating in the range of 60,000 to 1 million years. 36Cl decays to 36 S and to 36 Ar, with a combined half-life of 308,000 years. In the subsurface environment, 36Cl is generated primarily as a result of neutron capture by 35Cl or muon capture by 40 Ca. ![]() 36Cl is produced in the atmosphere by spallation of 36 Ar by interactions with cosmic ray protons. S2CID 73508148.Trace amounts of radioactive 36Cl exist in the environment, in a ratio of about 7x10 −13 to 1 with stable isotopes. "Neutron drip line in the Ca region from Bayesian model averaging". "Deep excursion beyond the proton dripline. "The AME2016 atomic mass evaluation (II). ![]() "The NUBASE2016 evaluation of nuclear properties" (PDF).
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