More Bad News for Radiometric Dating
Sep 23, Long-age geologists will not accept a radiometric date unless it It relates only to the accuracy of the measuring equipment in the laboratory. Source: Oxford Library. . Radiometric dating involves the use of isotope series, such as Scientists can check their accuracy by using different isotopes. What is the level of accuracy of this dating method? "This attitude is clearly reflected in a regrettably common practice: when a radiocarbon date agrees with .
A recent survey of the rubidium-strontium method found only about 30 cases, out of tens of thousands of published results, where a date determined using the proper procedures was subsequently found to be in error. Both long-range and short-range dating methods have been successfully verified by dating lavas of historically known ages over a range of several thousand years. The mathematics for determining the ages from the observations is relatively simple.
Rates of radioactivity One question that sometimes arises here is how can scientists assume that rates of radioactivity have been constant over the great time spans involved. Creationist Henry Morris, for example, criticizes this type of "uniformitarian" assumption [ Morrispg.
But numerous experiments have been conducted to detect any change in radioactivity as a result of chemical activity, exceedingly high heat, pressure, or magnetic field. None of these experiments has detected any significant deviation for any isotope used in geologic dating [ Dalrymplepg.Atheist Experience- Radiometric dating it doesnt work you know
Scientists have also performed very exacting experiments to detect any change in the constants or laws of physics over time, but various lines of evidence indicate that these laws have been in force, essentially the same as we observe them today, over the multi-billion-year age of the universe.
Note, for instance, that light coming to earth from distant stars which in some cases emanated billions of years ago reflects the same patterns of atomic spectra, based in the laws of quantum mechanics, that we see today. What's more, in observed supernova events that we observe in telescopes today, most of which occurred many millions of years ago, the patterns of light and radiation are completely consistent with the half-lives of radioactive isotopes that we measure today [ Isaakpg.
As another item of evidence, researchers studying a natural nuclear reactor in Africa have concluded that a certain key physical constant "alpha" has not changed measurably in hundreds of millions of years [ Barrowpg. Finally, researchers have just completed a study of the proton-electron mass ratio approximately Thus scientists are on very solid ground in asserting that rates of radioactivity have been constant over geologic time.
The issue of the "uniformitarian" assumption is discussed in significantly greater detail at Uniformitarian. Responses to specific creationist claims Wiens' online article, mentioned above, is an excellent resource for countering claims of creationists on the reliability of geologic dating. In an appendix to this article, Wiens addresses and responds to a number of specific creationist criticisms.
Here is a condensed summary of these items, quoted from Wiens' article [ Wiens ]: Radiometric dating is based on index fossils whose dates were assigned long before radioactivity was discovered. This is not at all true, though it is implied by some young-Earth literature.
Radiometric dating is based on the half-lives of the radioactive isotopes.
These half-lives have been measured over the last years. They are not calibrated by fossils. No one has measured the decay rates directly; we only know them from inference.
Decay rates have been directly measured over the last years.
Is Carbon Dating Accurate?
In some cases a batch of the pure parent material is weighed and then set aside for a long time and then the resulting daughter material is weighed. In many cases it is easier to detect radioactive decays by the energy burst that each decay gives off.
For this a batch of the pure parent material is carefully weighed and then put in front of a Geiger counter or gamma-ray detector. These instruments count the number of decays over a long time. If the half-lives are billions of years, it is impossible to determine them from measuring over just a few years or decades. The example given in the section [in Wiens' article] titled, "The Radiometric Clocks" shows that an accurate determination of the half-life is easily achieved by direct counting of decays over a decade or shorter.
Additionally, lavas of historically known ages have been correctly dated even using methods with long half-lives. The decay rates are poorly known, so the dates are inaccurate. Most of the decay rates used for dating rocks are known to within two percent. Such small uncertainties are no reason to dismiss radiometric dating. Whether a rock is million years or million years old does not make a great deal of difference. To date a rock one must know the original amount of the parent element.
But there is no way to measure how much parent element was originally there.
It is very easy to calculate the original parent abundance, but that information is not needed to date the rock. All of the dating schemes work from knowing the present abundances of the parent and daughter isotopes.
There is little or no way to tell how much of the decay product, that is, the daughter isotope, was originally in the rock, leading to anomalously old ages.
A good part of [Wiens' article] is devoted to explaining how one can tell how much of a given element or isotope was originally present. Usually it involves using more than one sample from a given rock.
It is done by comparing the ratios of parent and daughter isotopes relative to a stable isotope for samples with different relative amounts of the parent isotope. From this one can determine how much of the daughter isotope would be present if there had been no parent isotope.
This is the same as the initial amount it would not change if there were no parent isotope to decay. Figures 4 and 5 [in Wiens' article], and the accompanying explanation, tell how this is done most of the time. There are only a few different dating methods. There are actually many more methods out there. Well over forty different radiometric dating methods are in use, and a number of non-radiogenic methods not even mentioned here.
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A young-Earth research group reported that they sent a rock erupted in from Mount Saint Helens volcano to a dating lab and got back a potassium-argon age of several million years. This shows we should not trust radiometric dating. There are indeed ways to "trick" radiometric dating if a single dating method is improperly used on a sample. Anyone can move the hands on a clock and get the wrong time.
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Likewise, people actively looking for incorrect radiometric dates can in fact get them. Geologists have known for over forty years that the potassium-argon method cannot be used on rocks only twenty to thirty years old. Publicizing this incorrect age as a completely new finding was inappropriate. The reasons are discussed in the Potassium-Argon Dating section [of Wiens' article]. Be assured that multiple dating methods used together on igneous rocks are almost always correct unless the sample is too difficult to date due to factors such as metamorphism or a large fraction of xenoliths.
Different dating techniques usually give conflicting results. This is not true at all. The fact that dating techniques most often agree with each other is why scientists tend to trust them in the first place. Nearly every college and university library in the country has periodicals such as Science, Nature, and specific geology journals that give the results of dating studies.
The public is usually welcome to and should! So the results are not hidden; people can go look at the results for themselves. Unfortunately, tree ring dating is itself not entirely reliable, especially the "long chronology" employed to calibrate the carbon dating method.
The result is that carbon dating is accurate for only a few thousand years. Anything beyond that is questionable. This fact is born out in how carbon dating results are used by scientists in the scientific literature. Many scientists will use carbon dating test results to back up their position if the results agree with their preconceived theories.
But if the carbon dating results actually conflict with their ideas, they aren't too concerned. It is for specimens which only date back a few thousand years. Anything beyond that is problematic and highly doubtful.
Learn More about Carbon Dating! Godthe Father, sent His only Son to satisfy that judgment for those who believe in Him. Jesusthe creator and eternal Son of God, who lived a sinless life, loves us so much that He died for our sins, taking the punishment that we deserve, was buriedand rose from the dead according to the Bible. If you truly believe and trust this in your heart, receiving Jesus alone as your Saviordeclaring, " Jesus is Lord ," you will be saved from judgment and spend eternity with God in heaven.