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Half life used radiometric dating
Scientists can use the half-life of Carbon-14 to determine the approximate age of organic objects less than 40,000 years old.By determining how much of the carbon-14 has transmutated, scientist can calculate and estimate the age of a substance. Isotopes with longer half-lives such as Uranium-238 can be used to date even older objects.
Let's look closely at how the half-life affects an isotope. Therefore, after one half-life, you would have 5 grams of Barium-139, and 5 grams of Lanthanum-139.
After another 86 minutes, half of the 5 grams of Barium-139 would decay into Lanthanum-139; you would now have 2.5 grams of Barium-139 and 7.5 grams of Lanthanum-139.
In the ideal case, the material will incorporate a parent nuclide and reject the daughter nuclide.
In this case, the only daughter nuclides to be found through examination of a sample must have been created since the sample was formed.
The rate at which a radioactive isotope decays is measured in half-life.
The term half-life is defined as the time it takes for one-half of the atoms of a radioactive material to disintegrate.
In the field of nondestructive testing radiographers (people who produce radiographs to inspect objects) also use half-life information.
A radiographer who works with radioisotopes needs to know the specific half-life to properly determine how much radiation the source in the camera is producing so that the film can be exposed properly.
After one half-life has elapsed, one half of the atoms of the substance in question will have decayed.
Many radioactive substances decay from one nuclide into a final, stable decay product (or "daughter") through a series of steps known as a decay chain.