More on radioactive dating problems . That is, that while U-Pb dating gives an ' age' for certain zircon . That is, they arbitrarily restrict the solution space and, thereby, exclude certain solutions/explanations and, as a result. This is not necessarily a problem for radiometric dating, because it can be taken to be "dissolved" in certain mineral "solutions" preferentially to one another. How radiometric dating works in general: Radioactive elements decay gradually into other elements. Carbon dating is used to determine the age of biological.
uranium-lead dating method: Topics by edocki.info
Was Rb or Sr added to the rock by some unknown process? Was one of them removed from the rock by some unknown process? The isochron is supposed to take care of such issues. Essentially, rather than looking at the amounts of Rb and Sr, we look at their ratios compared to Sr The ratio of Sr to Sr is graphed versus the ratio of Rb to Sr for several different parts of the rock.
How does that help? Thus, it provides an independent analysis of the rock that does not depend on the radioactive decay that is being studied. The amount of Sr that was already in the rock when it formed, for example, should be proportional to the amount of Sr that is currently there.
Since the data are divided by the amount of Sr, the initial amount of Sr is cancelled out in the analysis.
He says that there is one process that has been overlooked in all these isochron analyses: Atoms and molecules naturally move around, and they do so in such as way as to even out their concentrations.
A helium balloon, for example, will deflate over time, because the helium atoms diffuse through the balloon and into the surrounding air.
Well, diffusion depends on the mass of the thing that is diffusing. Sr diffuses more quickly than Sr, and that has never been taken into account when isochrons are analyzed.
Hayes has brought it up, we can take it into account, right? If the effects of diffusion can be taken into account, it will require an elaborate model that will most certainly require elaborate assumptions. Hayes suggests a couple of other approaches that might work, but its not clear how well.
So what does this mean? If you believe the earth is very old, then most likely, all of the radioactive dates based on isochrons are probably overestimates. How bad are the overestimates? Most likely, the effect will be dependent on the age. I would think that the older the sample, the larger the overestimate.
As a young-earth creationist, I look at this issue in a different way. Certainly not enough to justify the incredibly unscientific extrapolation necessary in an old-earth framework.
More Bad News for Radiometric Dating
This newly-pointed-out flaw in the isochron method is a stark reminder of that. A good isochron was supposed to be rock-solid evidence pun intended that the radioactive date is reliable. We now know that it is not. The generally accepted age for the Earth and the rest of the solar system is about 4.
It decays to form.
The original element is called the parent, and the result … This dating is based on evidence from radiometric age-dating of meteorite material and is consistent with the radiometric ages of the oldest-known terrestrial and lunar samples.
It is a silvery-grey metal in the actinide series of the periodic table. A uranium atom has 92 protons and 92 electrons, of which 6 are valence electrons. Uranium is weakly radioactive because all isotopes of uranium are unstable, with half-lives varying betweenyears and 4.
Scientist Realizes Important Flaw in Radioactive Dating
When refined, uranium is a silvery white, weakly radioactive metal. This age may represent the age of the Earth's accretion, of core formation, or of the material from which the Earth formed. The Texarkana Gazette is the premier source for local news and sports in Texarkana and the surrounding Arklatex areas. The original element is called the parent, and the result of the decay process is called the daughter element. Uranium is a chemical element with symbol U and atomic number The decrease in radioactivity follows a characteristic pattern shown in the graph or decay curve.
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.