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Scientific Dates for Prehistoric Times Radioactive clocks tell time in the millions of years, but how accurately do they tell it?This article and the two following ones describe and evaluate the different means of radioactive dating used by geologists to measure the ages of rocks and the remains of once-living organisms.While other methods depend on aging processes that may go faster or slower under differing environmental conditions, such as changing temperature, radioactive decay rates have been shown to be unaffected by the extremes of external conditions.The Uranium-Lead Clock We can illustrate the method with the first radioactive clock devised, the one based on the decay of uranium to lead.free bbw site best dating site for married people chat free mobile soldiers in uniform mobile personals somali women dating free online mobile dating.teen dating 13 best dating site for married people big and beautiful people meet, little women dating: executive dating agency celtic women tour dates. When you read such reports, does the question sometimes cross your mind, How do they know?How certain is it that humans lived in Florida 10,000 years ago and in Japan 22,000 years ago, or that mastodons and camels were roaming the California landscape a million years ago?
Some are more reliable than others, but none are as certain as ages based on historical records.Radioactive decay goes strictly according to a law of statistical probability.The amount of uranium decaying in a unit of time is always proportional to the amount left.One half of the remaining half will decay in the next half-life, leaving one quarter of the original amount.After three half-lives, one eighth will be left, and so on. Since the uranium is transformed into lead, the amount of lead is increasing all the time.
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