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Assumptions used in radiometric dating

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In a related article on geologic ages (Ages), we presented a chart with the various geologic eras and their ages.

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Radiometric dating is self-checking, because the data (after certain preliminary calculations are made) are fitted to a straight line (an "isochron") by means of standard linear regression methods of statistics.However, conditions may have been different in the past and could have influenced the rate of decay or formation of radioactive elements.Evolutionists assume that the rate of cosmic bombardment of the atmosphere has always remained constant and that the rate of decay has remained constant.In 1972 this assumption was shown to be highly questionable.Despite this, the momentum gained in the two decades prior to 1972 has made 4.5 b.y.Because your computer is running an older version of internet browser, it no longer meets the features of modern websites.

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This technique is widely used on recent artifacts, but educators and students alike should note that this technique will not work on older fossils (like those of the dinosaurs alleged to be millions of years old).

This technique is not restricted to bones; it can also be used on cloth, wood and plant fibers.

The basic theory of radiometric dating is briefly reviewed.

Since 1955 the estimate for the age of the Earth has been based on the assumption that certain meteorite lead isotope ratios are equivalent to the primordial lead isotope ratios on Earth.

The slope of the line determines the date, and the closeness of fit is a measure of the statistical reliability of the resulting date.