Assumptions made carbon dating
Uraniums abbreviation is U, so uranium-238 can be more briefly written as U238.Many nuclides are stable -- they will always remain as they are unless some external force changes them.Different nuclides of the same element can have substantially different half-lives.) billion years old.So, if we know how much of the nuclide was originally present, and how much there is now, we can easily calculate how long it would take for the missing amount to decay, and therefore how long its been since that particular sample was formed. We must know the original quantity of the parent nuclide in order to date our sample In order to do so, we need a nuclide thats part of a mineral compound. Because theres a basic law of chemistry that says "Chemical processes like those that form minerals cannot distinguish between different nuclides of the same element." They simply cant do it.
There are two common kinds of radioactive decay, alpha decay and beta decay.
The half-life of a radioactive nuclide is defined as the time it takes half of a sample of the element to decay.