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Tritium 3 H, half-life of Tritium input to ground water has occurred in a series of spikes following periods of atmospheric testing of nuclear devices that began in and reached a maximum in Concentrations of 3 H in precipitation have decreased since the mids bomb peak, except for some small increases from French and Chinese tests in the late s. Radioactive decay of 3 H produces the noble gas helium-3 3 He. Tritium measurements alone can be used to locate the depth of the mids bomb peak, but, because of radioactive decay, many samples may need to be collected and analyzed today to locate its position. In systems younger than the mids, the bomb peak will not be present due to radioactive decay. Although initial 3 H concentrations have decreased because of radioactive decay, measurements of 3 H and tritiogenic 3 He define a quasi-stable tracer of initial 3 H input to ground water and may be used to determine the position of the mids bomb peak in recharge areas.
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There was also a historical test of a piece of linen performed in by Willard Libby , the inventor of the dating method. One of the earliest carbon dating tests was carried out on November 14, In , Robert Eisenman and Philip R. Davies made a request to date a number of scrolls, which led to a series of tests carried out in Zurich on samples from fourteen scrolls. Among these were samples from other sites around the Dead Sea, which contained date indications within the text to supply a control for the carbon dating results.
Uranium-Thorium dating is based on the detection by mass spectrometry of both the parent U and daughter Th products of decay, through the emission of an alpha particle. The decay of Uranium to Thorium is part of the much longer decay series begining in U and ending in Pb. With time, Thorium accumulates in the sample through radiometric decay. The method assumes that the sample does not exchange Th or U with the environment i.
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