 The ratio of calcium formed to argon formed is fixed and known.

Therefore the amount of argon formed provides a direct measurement of the amount of potassium-40 present in the specimen when it was originally formed.

However, any escaping argon gas would lead to a determined age younger, not older, than actual.

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.

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).

If we knew the fraction of a radioactive element still remaining in a mineral, it would be a simple matter to calculate its age by the formula To determine the fraction still remaining, we must know both the amount now present and also the amount present when the mineral was formed.

I know can be hard to wrap your head around, so let's model it with a six-sided die. You can use Lego bricks, pennies, beans—anything you can easily count. Every time you roll a one, put that object into a separate pile.

Any argon present in a mineral containing potassium-40 must have been formed as the result of radioactive decay.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.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.If you're behind a web filter, please make sure that the domains *.and *.are unblocked.Radiometric dating is a means of determining the "age" of a mineral specimen by determining the relative amounts present of certain radioactive elements.   The number of protons in the nucleus of an atom is called its atomic number.