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Radioactive elements "decay" (that is, change into other elements) by "half lives." If a half life is equal to one year, then one half of the radioactive element will have decayed in the first year after the mineral was formed; one half of the remainder will decay in the next year (leaving one-fourth remaining), and so forth.The formula for the fraction remaining is one-half raised to the power given by the number of years divided by the half-life (in other words raised to a power equal to the number of half-lives).The corresponding half lives for each plotted point are marked on the line and identified.It can be readily seen from the plots that when this procedure is followed with different amounts of Rb87 in different minerals, if the plotted half life points are connected, a straight line going through the origin is produced. The steeper the slope of the isochron, the more half lives it represents.The decrease in the amount of potassium required to form the original mineral has consistently confirmed the age as determined by the amount of argon formed.Carbon-14 dating: See Carbon 14 Dating in this web site.The creationist "argon escape" theory does not support their young earth model.) The argon age determination of the mineral can be confirmed by measuring the loss of potassium.In old rocks, there will be less potassium present than was required to form the mineral, because some of it has been transmuted to argon.

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Therefore the relative amounts of rubidium-87 and strontium-87 can be determined by expressing their ratios to strontium-86: Rb-87/Sr-86 and Sr87/Sr-86 We measure the amounts of rubidium-87 and strontium-87 as ratios to an unchanging content of strontium-86.Radiometric dating is a means of determining the "age" of a mineral specimen by determining the relative amounts present of certain radioactive elements.By "age" we mean the elapsed time from when the mineral specimen was formed.An atom with the same number of protons in the nucleus but a different number of neutrons is called an isotope.

For example, uranium-238 is an isotope of uranium-235, because it has 3 more neutrons in the nucleus.

It has the same number of protons, otherwise it wouldn't be uranium.

• What is Radioactive Dating? - Definition & Facts

## paulette60

What Exactly Is Radioactivity? Elements occur naturally in the earth, and they can tell us a lot about our Earth's past. Carbon, uranium and potassium are just a few examples of elements used in radioactive dating. Each element is made up of atoms, and within each atom is a central particle called a nucleus. Within the.…

## paulette60

Expand. Contemporary Examples. radioactive dating does show that the Earth is billions and not thousands of years old, refuting young-Earth creationism. How Noah's Flood Spurred Science David R. Montgomery's 'The Rocks Don't Lie' David Sessions August 28, 2012. British Dictionary definitions for radioactive dating…
• Carbon-14 Radioactive Dating Worked Example Doc Physics.

## paulette60

Apr 19, 2013. I'm thinking about getting back into dating. I'm only going to be seeing bits of cloth and broken plates, so there's no need to tell my wife. Besides - they'.…
• Cool examples of radiometric dating? Physics Forums

## paulette60

Feb 21, 2013. There is a new method testing the eye that is even more accurate, but only useful within 3 days of death. And I meant radiometric dating as a whole is used for fossils and old rocks, not C-14. The C-14 being used forensically was just an example of radiometric dating being used for something different.…
• Radiometric dating Example sentences - Cambridge Dictionary

## paulette60

Examples of how to use “radiometric dating” in a sentence from the Cambridge Dictionary Labs.…
• Radioactive dating - Australian Museum

## paulette60

Radioactive dating is a method of dating rocks and minerals using radioactive. Some techniques place the sample in a nuclear reactor first to excite the.…