Because its half-life is so long it is useful for dating the oldest rocks on Earth, but not very reliable for rocks under 10 million years old. This is ten times the age of the Earth, so very little Rubidium has decayed at all.
For this reason WE WILL NEVER CHOSE TO USE THIS ISOTOPE!
When we die, we no longer ingest C14, and it begins to decay and turn into N14.
By comparing the amount of C14 in an object to the amount of N14 in it we can determine how long it has been decaying for, and therefore when the organism died. Through decay Uranium-238 turns into stable Lead-206.
The half-life of a radioactive isotope describes the amount of time that it takes half of the isotope in a sample to decay.However, the principle of carbon-14 dating applies to other isotopes as well.Potassium-40 is another radioactive element naturally found in your body and has a half-life of 1.3 billion years. As soon as a living organism dies, it stops taking in new carbon.The ratio of carbon-12 to carbon-14 at the moment of death is the same as every other living thing, but the carbon-14 decays and is not replaced.The last figure I heard was that there are currently eight nuclear subs on our ocean floors. It doesn't work for sea creatures and other things that are under water. Then they measure how much is left in the specimen when they find it. It comes from cosmic rays that rain down on the earth (and us) from outer space.On the cover of your ESRT in the top left box you will find the Radioactive Decay Data for four isotopes which we will focus on.Carbon 14 occurs naturally, and is absorbed by all living things when we eat and drink.If you're seeing this message, it means we're having trouble loading external resources on our website.If you're behind a web filter, please make sure that the domains *.and *.are unblocked.