Application of isotopes in carbon dating Free skype dates with sexy girls
We know these steps because researchers followed the progress of carbon-14 throughout the process.Radioactive isotopes are useful for establishing the ages of various objects.The half-life of radioactive isotopes is unaffected by any environmental factors, so the isotope acts like an internal clock.For example, if a rock is analyzed and is found to contain a certain amount of uranium-235 and a certain amount of its daughter isotope, we can conclude that a certain fraction of the original uranium-235 has radioactively decayed.
One excellent example of this is the use of carbon-14 to determine the steps involved in photosynthesis in plants.
Using such methods, scientists determined that the age of the Shroud of Turin (Figure 15.3 “Shroud of Turin”; purported by some to be the burial cloth of Jesus Christ and composed of flax fibres, a type of plant) is about 600–700 y, not 2,000 y as claimed by some.
Scientists were also able to use radiocarbon dating to show that the age of a mummified body found in the ice of the Alps was 5,300 y.
The radiation emitted by some radioactive substances can be used to kill microorganisms on a variety of foodstuffs, extending the shelf life of these products.
Produce such as tomatoes, mushrooms, sprouts, and berries are irradiated with the emissions from cobalt-60 or cesium-137.