Uranium-thorium dating method A relatively short-range dating technique is based on the decay of uranium-234 into thorium-230, a substance with a half-life of about 80,000 years.
 Because the fission tracks are healed by temperatures over about 200°C the technique has limitations as well as benefits.
Possible minimal alteration will be agreed before any operation." This indisputably implies that the testing he would perform would be completely NON-DESTRUCTIVE and was one of the critical considerations STERA, Inc.
36Cl has seen use in other areas of the geological sciences, including dating ice and sediments.
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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.