This could be stated as a fraction, decimal or ratio. For example the amount of a sample remaining after four half-lives could be expressed as: This could then be incorporated into other data. So if the half-life is two days, four half-lives is 8 days. The half-life of cobalt is 5 years.
If there are g of cobalt in a sample, how much will be left after 15 years? As a ratio of what was present originally compared to what was left, this would be What is the half-life of a sample where the activity drops from 1, Bq down to Bq in 10 days? Half of 1, is , half of is This page is best viewed in an up-to-date web browser with style sheets CSS enabled. While you will be able to view the content of this page in your current browser, you will not be able to get the full visual experience.
- Carbon dating.
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webdisk.openpress.alaska.edu/21426.php Print Science Uses of radioisotopes. By comparing how much carbon there is in the dead organism with the amount in a living one, the age of the dead organism can be estimated. The half-life of uranium is million years.
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When it decays it forms thorium which is also unstable. Finally, after a series of radioactive isotopes are formed it becomes lead, which is stable.
The age of the rock can be calculated if the ratio of uranium to lead is known.