

Why is radiometric dating reliable, a response to “scientific” creationism


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The mathematics for determining the ages from the observations is relatively simple. However, it is now generally accepted that this assumption is not upheld with sufficient reliability to attribute age significance to erupted isochrons.

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Tools for Digging Deeper. We are told that these methods are accurate to a few percent, and that there are many different methods. The dates average 1. So the yearly layers of ice can be tracked by each of these five different indicators, similar to growth rings on trees.


Boltwood had conducted studies of radioactive materials as a consultant, and when Rutherford lectured at Yale in[29] Boltwood was inspired to describe the relationships between elements in various decay series.

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A great many experiments have been done in attempts to change radioactive decay rates, but these experiments have invariably failed to produce any significant changes. Why is radiometric dating reliablescience firmly established that the earth was 3.

Argon, the daughter substance, makes up about one percent of the atmosphere, which is therefore a possible source of contamination. Argon is released from lava as it cools, and probably filters up into the crust from the magma below, along with helium and other radioactive decay products.

Argon is about 3. The problem with this approach is that it leaves ample room for the exercise of subjective judgment and evolutionary assumptions. Thermoluminescence dating, or TL dating, uses the fact that radioactive decays cause some electrons in a material to end up stuck in higher-energy orbits.

But I put them all in anyway, figuring some readers would understand one more easily than the other. This argon 40 will then be trapped within the resulting rocks and lead to artificially old K-Ar dates.


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We can only speculate on Dating postcards by stamps Kofahl and Segraves obtained their numbers. As the gas bubble explodes, its enclosed argon will be rushing outward along with these tiny bubbles as they cool.

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Since the half-life of carbon is less than 6, years, it can only be used for dating material less than about 45, years old. Jueneman, however, does not propose that decay rates would be changed, nor does he state how the clocks would be reset; in addition, there is no evidence to support his speculation.

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Heating and deformation of rocks can cause these atoms to migrate, and water percolating through the rocks can transport these substances and redeposit them. The heavy isotope is lower in abundance during the colder winter snows than it is in snow falling in spring and summer.

As one goes further down in the ice core, the ice becomes more compacted than near the surface, and individual yearly layers are slightly more difficult to observe. Chamberlain pointed out that Kelvin's calculations were only as good as the assumptions on which they were based.

Dating Methods | Answers in Genesis

However, this causes a problem for those who believe based on the Bible that life has only existed on the earth for a few thousand years, since fossils are found in rocks that are dated to be over million years old by radiometric methods, and some Why is radiometric dating reliable are found in rocks that are dated to be billions of years old.


Because of this, the uranium, and its contribution to the thorium abundance, can in many cases be ignored in sediments. Because they have no charge and little or no mass, neutrinos do not interact much with matter — most pass unimpeded right through the Earth — and they can be detected experimentally only with great difficulty.


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My point was that the usual mixing test can only detect two sources. Second, there have been sufficient tests to show that during their formation in the crust, igneous and metamorphic rocks nearly always release their entrapped 40Ar, thus resetting the K-Ar clock.


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Beyond this, scientists have now used a "time machine" to prove that the half-lives of radioactive species were the same millions of years ago. It is often mentioned that different methods agree on the K-T boundary, dated at about 65 million years ago. But argon does not need to move through all rock in order to influence radiometric dates, it only has to reach ancient lava flows.

Another type of decay for which small changes in rate have been observed is internal conversion IC. Suppose the partial pressure of argon 40 in lava or magma is initially at least p, as it cools.

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